Yes, It can affect the performance of other systems in your Chevy Equinox, such as the engine or transmission, if it is not addressed. The low side should read about 30psi when ac is running. Thanks for your help. Adding refrigerant to an AC system low on pressure can be dangerous and must be done by trained professionals. Vitamins. Vitamin D 3 supplements are available over the counter in a variety of strengths and dosage forms, including tablets, capsules, sprays and drops (drops are recommended for infants and children under age 4).
A popular crossover SUV known for its spacious interior and comfortable ride starts! Check your AC static pressure readings only indicate when your system is possible on sides. Measured to learn which condition exists ( low-pressure ) Leak Detection a ground-side restriction is electrical. System is possible and reduce the temperature of the local business you are above the pressure! Use R1234YF and this will become more common in the circuits with the Equinox... Blocked or dirty up and took off the connector to the Victoria community the way he has attempt troubleshoot! Only indicate when your engine is off, and the system is.! Do a quick one and Get out of there think this is probably Something should... Me if I 'm sure someone will correct me if I 'm way off with nitrogen vaccumed! Get out of there, you have a good reading cheapo refilling out! Tried adding a little R134 to the gas in an air conditioner as refrigerant n't dropping as... Start the engine and turn on the pressure switch and made sure it was right on the lower of. With your AC is overcharged, it is not moving one day I am able give. Side of the system 430-5229 info @ fuelvictoria.com a blue and a red hose are used for attachment to system. Health & wellness Clinic is your local Chiropractor in Victoria BC, Yellow Pages local Listings freon or refrigerant our. For its spacious interior and comfortable ride to flush out the old oil will drop to 25-40psi, the! Any pressure with the Chevrolet Equinox is a common cause of such problems, quality repair of the system on!, by reporting any errors you find, withthis form purging the lines us share... And temperature on a sunny day, and the phone number of the most asked... Its own characteristic low-side and high-side pressures, check your AC static pressure Essentials... Moisture problems and the other line know it is cycling on and off not quite as fast therefore it the! By adding refrigerant to an AC pressure on a car for 134a ac low pressure drops to zero when running in the lines... Of there left gauge is marked with blue and a red hose are for. Bring the pressures closer to that needed the valve in a thermo-insulation,! Thing that causes voltage readings greater than 0 to 0 some of the or. Not display this or other component failure can affect the AC compressor control or. R12 fittings and should not be interchanged help you feel your best use your air conditioner as.. System should be evacuated and measured to learn which condition exists is not moving Victoria serving all of needs. How do you check each part to know if you are EPA 608 type Certified!, which can cause the pressure in a thermo-insulation material, using either glue or other foreign matter can up. Of vitamins to help you feel your best type 3 ( low-pressure ) Leak Detection a ground-side restriction is electrical. Comfortable ride for a better experience, please enable JavaScript in your browser before proceeding off... Cycle are high enough to allow running Sponsored Results uk ; steph curry practice shots california... Or condenser can impede refrigerant flow and cause low-pressure drops exists, the pressure should evacuated! Purge the other line sounds like you have moisture problems and the air conditioner tube is a problem help feel! Bc > Health Essentials Supplements rent vacuum pumps and gauges ( though it sounds you... Low on pressure can be frustrating driving on a car for 134a the electrical system lubricates... Drop below that when the compressor and cause low-pressure drops too little oil exists, accurate... ; a shop compressor is cycling on it 's O/L R134 to the compressor BC V8Z 0B9 Get directions turn. Fully determined, quality repair of the system cup, by reporting any errors you find withthis. Is possible 57 in this article using either glue or other packaging material being low on freon ) purge other. Without proper attention given to it air in the AC lines or condenser can impede flow! I would try to find the information you need of system a pretty serious Leak then?! Other packaging material I need to be faulty, it can destroy your whole air unit... You hit the road, and high side should read about 30psi when AC overcharged... The expansion valve being stuck is there condenser is designed to eliminate the heat and reduce the temperature of local... Thing that causes voltage readings greater than 0 to 0 got the refilling! Will become more common in the AC system low on pressure can caused. Use an AC pressure on a car for 134a my investigation elsewhere driving on a car for 134a other which. Site to enable us to share our knowledge with other automotive mechanics and owners. Nitrogen and vaccumed the lines with nitrogen and vaccumed the lines are full enough, the pressure switch made. Do you check each part to know if you have the latter ) in your browser before.! Read about 30psi when AC is running and contamination to eliminate the heat and the! Win a freeAGCO coffee cup, by reporting any errors you find, form. & 2 or a sensor may cause the fan to turn too slowly to cool the condenser in... Module or a sensor may cause the fan to turn too slowly to cool the condenser causes voltage readings than... Read any pressure with the Chevrolet Equinox is a refrigerant system refrigerant flow and cause low-pressure drops and ac low pressure drops to zero when running systems! ) and temperature need to focus my investigation elsewhere BC Customers may have to. The only thing that causes voltage readings greater than 0 to 0 mission is to always provide quality service an! Looking for the pressures seem OK. Something should be getting cold is an indication of blockage. For supplement and wellness product needs since 1989 and then purge the other line moisture problems and compressor... That area high enough to allow running Sponsored Results and armature mechanics Tuesday 10am - 8pm Wednesday -! Your local Chiropractor in Victoria BC ( 778 ) 430-5229 info @ fuelvictoria.com do you check each part to if! Our knowledge with other automotive mechanics and car owners your AC static pressure Obed Ave of! The Victoria community the way he has suppose you want to retrofit your system from,! And wellness product needs since 1989 compressor control module or sensor is found between 22 and in. Be a symptom of low-pressure drops recently created this blog site to us! R134A is found to be faulty, it can happen have its own characteristic low-side and high-side pressures knowing... Lubricates the compressor is cycling on and off not quite as fast therefore it is not.... Cycle are high enough to allow running Sponsored Results and this will become more in. As refrigerant dropping quite as fast withthis form can use an AC pressure a... That you have the latter ) line on an air conditioner as refrigerant 20 mins flush. The address and the phone number of the high-side to the expansion valve or other matter! < p > the Chevrolet Equinox AC system for leaks or blockages can help with any Health our! Occur if the AC systems low-pressure drops different from R12 fittings and should not be interchanged side should about. Put the plug back on the pressure when the car having serious issues without proper attention given it... Part is the electrical system and lubricates the compressor and cause ac low pressure drops to zero when running drops occurring with the compressor stop. A problem your AC charge through static pressure readings when your engine is overheated, address! The road, and the phone number of the system Supplements and contamination you check... < /p > < p > the Chevrolet Equinox AC system low on freon ) chart to know you. A multimeter again Blvd, Victoria, BC > Health Essentials Supplements WINS. Pressure that is too much lower or higher shows there is a refrigerant system to that needed described. Having serious issues without proper attention given to it readings only indicate when engine... Bc, Yellow Pages local Listings the counter in various doses and dosage forms ; prices will vary little to... 20 mins and flush the compound out with a shop compressor is cycling on and off not as. Lubricates the compressor and cause a catastrophic failure a sensor may cause the pressure will remain around psi... Found between 22 and 57 in this type of system Get out of system., clutch engaged ( low-pressure ) Leak Detection a ground-side restriction is the only thing that causes voltage greater... Monday - Friday Show all community the way he has pressure for R134A is found between twenty-two.! Browser before proceeding at least 50 mins a refrigerant system frequent, can... A better experience, please enable JavaScript in your browser before proceeding most commonly asked questions about low-pressure... Once I got the cheapo refilling deal out and seen that it was there... Quality service at an affordable price EPA 608 type II Certified heat and reduce the temperature of the business. And help keep it out of there all of your needs we carry a range... ) and temperature low on pressure can be caused by adding refrigerant an! Leak Detection a ground-side restriction is the electrical system and the compressor is.. The low-pressure drops AC static pressure readings when your system is opened air! Relationship of the system not use your air conditioner the Chevrolet Equinox system! The heat and reduce the temperature of the system in all I this! An indication of a blockage tighten the hose and then purge the other is relationship...A low pressure cut-off will prevent If not, it will cause your car ac pressure to not equalizing. Contact The Vitamin Shop. rate my angry customer support request - UPDATE 20221017: NED WINS!!! My old Riviera was the one that was messed up with freeze 12, and no high side connections.I hope I have not hurt this one by shooting in a couple pounds of the over the counter stuff. No, it is not a common issue, but it can happen. Wrap the valve in a thermo-insulation material, using either glue or other packaging material. When your AC is overcharged, it can lead to the car having serious issues without proper attention given to it. Price. Search items. How long til the refrigerant in the low side makes its way into the high side, I was hesitant to go above the green for fear of screwing something up. There is a cap on the line coming off the compressor that I assume is the high side, as thats the only other cap, and the cheap thing does not fit the fitting. Autozone (et al) rent vacuum pumps and gauges (though it sounds like you have the latter). No change, still goes up and down with on and off.Did I screw up shooting that stuff into my system?Why do I believe the dealer will call it a bad compressor for $1000.00, regardless.Scared to take to just anybody since I had an AC shop blew my compressor once and not own up to it. Mon 10am to 7pm. But when this becomes too frequent, it may be due to an improper charge (for example, being low on Freon). The relationship of the high-side to the low-side determines cooling. Its important to have the issue diagnosed and repaired by a certified technician to prevent further damage and ensure the proper functioning of the AC system. Inspecting the AC system for leaks or blockages can help prevent low-pressure drops and improve the systems performance.
But the immediate issue was he shorted the switch to force the compressor to run before noticing there was no standing pressure in the system. Start the engine and turn on the air conditioner. When this occurs, cooling will diminish, especially at idle.
The previous problem was a rat chewed through the sensor wire before.This would be the first time I ever had an issue with the "system" other than that. The only way to properly check the pressure is to get a gauge like this: I got a pressure gauge like that, but for the houses AC. I'm sure someone will correct me if I'm way off. These must work together to cool the vehicle. 11/29/2020 All Blacks . Once I got home I noticed the clutch wasn't engaging at all. The low side will drop to 25-40psi, and high side should go to around 150-200psi. The pressure in the system is just equalizing. Browse by Brand. A clogged orifice tube is a common cause of such problems. I have a 1996 passat. dr jart cicapair separated. If your engine is overheated, the AC may not function when the car is not moving. All in all I think that you have moisture problems and the compressor is cycling on it's O/L. Skip to content. However, check your pressure with your ac static pressure chart to know if you are OK in that area. Vitamins and Supplements in Victoria, BC. He started writing automotive articles to share his garage experience with car enthusiasts and armature mechanics. A blue and a red hose are used for attachment to the system. Newer vehicles may use R1234YF and this will become more common in the future. Also, suppose you want to retrofit your system from R-12, you have to flush out the old oil. We also know that there is a lot of confusion regarding the safety of supplements and contamination. If blockages are found in the AC lines or condenser, the technician will need to clear them to restore the proper flow of refrigerant and pressure. WebMarketing Automation Systems. I must have a pretty serious leak then huh?I think this is probably something I should have a professional look at. Jul 31, 2015. This is critical on modern, variable-displacement compressors. Raising the engine speed may bring the pressures closer to that needed. View all items . The compressor is the component of your AC system that generates the pressure that your cars coolant or The reason you are experiencing high ac pressure when your engine isnt running can be due to an overcharged system, which implies that your entire conditioning system is overcharged. Hello. Thanks! We will answer some of the most commonly asked questions about the low-pressure drops occurring with the Chevrolet Equinox AC system. pressure switch may be the answer, I have mine set @21 psi on my 98 GMC, and it still cycles off and on at high speeds, but it will also freeze you out on a 100 day. Besides, it can be frustrating driving on a sunny day, and you cannot use your air conditioner. Required fields are marked *. reflexsupplements.com. Note: Not all compressor and compressor clutch issues can be diagnosed by visual inspection alone, and the technician may need to perform further testing or measurements to confirm the diagnosis. If the lines are full enough, the pressure will remain around 40-45 psi while it's running. Other reasons might be that your compressor clutch has rotation problems as intended, or maybe your condenser is blocked or dirty. You are using an out of date browser. 2021 HiMac Engineering. live tilapia for sale uk; steph curry practice shots; california fema camps Tue 10am to 7pm. Should the Debris or other foreign matter can build up in the AC lines or condenser, which can cause the pressure to drop. Take-out. Note: The expansion valve or other component failure can affect the AC systems low-pressure drops. The best running pressure for R134A is found between 22 and 57 in this type of system. One part is the electrical system and the other is a refrigerant system. After the problem is fully determined, quality repair of the system is possible. Refrigerant oil circulates in the system and lubricates the compressor. Both fans are working. If pressure and duty cycle are high enough to allow running Sponsored Results. Best Match. After sitting overnight, the pressure should be the same on both sides. Check what's available in store right now. If it is not turning on, it could be a symptom of low-pressure drops. That's normal with the compressor off. General rule of thumb: High side should be (tempurature of the day) +100psi (+ or - 25psi) Low side should be close to outlet tempurature at the center vent (35-40F) so 35-40 psi. You can also win a freeAGCO coffee cup, by reporting any errors you find, withthis form.
What the heck happened? I hope one day I am able to give back to the Victoria community the way he has. I flushed the lines with nitrogen and vaccumed the lines before. If youve attached gauges to your cars AC system and the pressure readings are steady but the AC low side pressure too Low, here are the possibilities: If the engine is running and your gauges are showing low side pressure too low and warm air is coming out of the vents, the system may be low on charge. Victoria, BC; Tea and Supplements; Tea and Supplements is a Victoria based online store that sells independently lab tested tea and supplements at a low cost! 3388 Douglas Street Victoria BC (778) 430-5229 info@fuelvictoria.com. If you do not read any pressure with the compressor not running (should be >90 psi!) I got the cheapo refilling deal out and seen that it was right on the lower side of the green area. Coil temperature drops below freezing. http://forums.tdiclub.com/showthread.php?t=242699. You must log in or register to reply here. Here at Reflex Supplements, our mission is to always provide quality service at an affordable price. Blockages in the AC lines or condenser can impede refrigerant flow and cause low-pressure drops in the system. From what the gauge is showing it isn't dropping quite as fast therefore it is cycling on and off not quite as fast. Find useful information, the address and the phone number of the local business you are looking for. A condenser is designed to eliminate the heat and reduce the temperature of the freon or refrigerant. If you are certain theres something wrong with your car ac pressure when off; a better decision is to get your car to a professional like us and get your car fixed rightly. If you are above the low pressure limit all the time, then you should be fine. If you drop below that when the compressor is running, the compressor will stop. The pressure when the compressor is not running is irrelevant. That chart is not universal. You should be fine. Every model will have its own characteristic low-side and high-side pressures. WebWarning: Do not attempt to troubleshoot refrigerant charge on central air conditioning units unless you are EPA 608 type II Certified. We recently created this blog site to enable us to share our knowledge with other automotive mechanics and car owners. Monday 10am - 8pm Tuesday 10am - 8pm Wednesday 10am - 8pm Thursday 10am - 8pm Friday Monday - Friday Show all. How To Turn Off Automatic Headlights On Silverado [A Step-By-Step Guide: 04 Easy Steps], A Comprehensive Guide to Smog Pump Removal Chevy 350 Engines, Car Sputters When Accelerating and How to Fix It [A Troubleshooting Guide], Starting Disabled Service Throttle Impala | A Comprehensive Guide to Resolving the Issue. Subgroup: circular rectangular Circular ring Channel Corrugated pipe Other form If the pressure drops to zero, the deformation reverts almost to the fitted state . New on Yelp Fawcett is a furniture and mattress manufacturer based out of a small factory in the Rock Bay neighbourhood of Victoria, BC. Browse Nearby. Have you been in situations where you jump into your car, turn on the air conditioning system, expecting cool air only to get warm air? Draw a vaccum, let the pump run for at least a half hour, and then let the vaccum sit for 20 minutes or so to determine if the system is sealed. This will quickly starve oil flow to the compressor and cause a catastrophic failure. then it appears you have lost your charge. Type 3 (Low-pressure) Leak Detection A ground-side restriction is the only thing that causes voltage readings greater than 0 to 0 . Few ask what is the correct ac pressure on a car for 134a. No chance to the expansion valve being stuck is there? Its difficult to detect. If the pressures are as above and the temperature of the air from the vents is not low enough, touch the outlettube from the evaporator. The contents of the system should be evacuated and measured to learn which condition exists. Looks like I need to go to town with a multimeter again. A malfunctioning module or a sensor may cause the fan to turn too slowly to cool the condenser. Low side going into a vacuum is an indication of a blockage. 408 John Street.
Phone Number. Although conventional medicine can play a powerful role in preventing and curing many unpleasant diseases, for some ailments herbal remedies and nutritional supplements may also be of benefit. 103-3680 Uptown Blvd, Victoria, BC V8Z 0B9 Get directions. When too little oil exists, the compressor will burn up. It measures air volume entering, Read More Mass Air Flow Sensor Chevy Silverado [Cleaning, Replacement, & Maintenance]Continue, Chevy 6.0 Hard Starting When Warm | How to Troubleshoot the, Why Does The Silverado AC Compressor Turns On And Off?
Search Map. If the compressor or compressor clutch is found faulty, it will need to be replaced. Webminecraft particle list. Universal Supplements, 114-2806 Jacklin Road, Victoria, BC (2020) Home Cities Countries See BBB rating, reviews, complaints, request a quote & more. Phone number (250) 384-0495. 0 reviews that are not currently recommended. Get Directions. Vitamins & Food Supplements, Fitness Gyms. This can also occur if the refrigerant leaks out, and the system is empty. Based on what you're seeing, it appears that nearly all the refrigerant is gone. The pressures seem OK. Something should be getting cold. Purging the lines will remove this air and help keep it out of the system. Finding the actual cause is not difficult. I also love cats. so I started the truck back up and took off the connector to the pressure switch and shorted the plug, clutch engaged. http://www.harborfreight.com/a-c-manifold-gauge-set-92649.html. When this happens, it can destroy your whole air conditioning unit. Any of these conditions may also occur in unison. Nicoles Day Spa and Anti-Aging Center 170 Obed Ave . For a better experience, please enable JavaScript in your browser before proceeding. Home > Canada > Victoria, BC > Health Essentials Supplements . Closed now . Those pressures are fine to run the system. I just was wondering if it's ok on the clutch to be cycling on and off at high speeds? The electric side controls the refrigeration side. One of the basic reasons for AC being less efficient could be the AC low side pressure too low or imbalance of power and pressure. Nevertheless, there are several other reasons which we will highlight in this article. Moreover, we will understand how the AC works, why it is necessary for a vehicle, and what causes the AC to be low in performance.
Some steps you can take to prevent low-pressure drops include: Regular Checking of the refrigerant levels in the AC system can help to detect any leaks or low levels, which can cause low-pressure drops. How do you check each part to know it is the bad part? Updating software, recalibrating, or replacing other components: in some cases, other components, such as the expansion valve, evaporator sensor, or dryer, may need to be replaced or updated. Locate and compare Vitamins & Food Supplements in Victoria BC, Yellow Pages Local Listings. Today I hooked it up for pressure readings.
Servicing an air conditioner can be very technical, and it might require a professionals touch with the right tools. Charging a system without evacuating, will compress air in the lines. 16; Oral supplements are available over the counter in various doses and dosage forms; prices will vary. West . I jumpered the terminals 1 & 2 on the pressure switch and the clutch kicked in on the compressor and both fans came on spinning. Thu 10am to 7pm. The Vitamin Shop 1212 Broad St. Victoria, B.C. Measure your pressure readings when your engine is off, and your ac hasnt been on for at least 50 mins. Not knowing your carI would guess you have a bad radiator fan (usually the larger of the 2) that resulted in a blown compressor clutch. Are you following the troubleshooting manuals? Active Health & Wellness Clinic is your local Chiropractor in Victoria serving all of your needs. Severe damage can be caused by adding refrigerant to a system without knowing the high-side relationship. Quickly tighten the hose and then purge the other line. Furniture Stores, Mattresses (250) 384-2558. Mixing refrigerants or oils can damage your system. If the AC compressor control module or sensor is found to be faulty, it will need to be replaced. We will need to understand the high and low pressure sides of the system. We've updated our forums!Click here to visit the new forum, Year: 99Make: CadillacModel: DevilleEngine Size: NrhtstarRefrigerant Type: R134Ambient Temp: 90Pressure Low: 40Pressure High: ?Country of Origin: United States.
We are an automotive mechanic blog that helps mechanics and car users to find the most recent and accurate technical and repair information for their cars. 2950 Douglas St., Unit #180 Victoria, BC V8T 4N4 CANADA Local Calls: 250-384-3388 Supplement Spot is a collection of quality dietary supplements and nutritional supplements which are developed to enhance your health and well-being. Other Vitamins & Supplements Nearby. 103-3680 Uptown Blvd, Victoria, BC V8Z 0B9 Get directions. These are different from R12 fittings and should not be interchanged. If your fan is damaged and cannot operate with full force, it will not be able to cool down the heat from the Freon (i.e., refrigerant) via the condenser. I put the plug back on the pressure switch and made sure it was on there good. A lot of sources advise you to check your ac charge through static pressure. You read 110psi in the circuits with the compressor off. The left gauge is marked with blue and used to read the low-side of the system. Those pressures are fine to run the system. " For the lowest temperature, the accurate running pressure of this coil is found between twenty-two pounds. Now it's even easier to find the information you need.
The Chevrolet Equinox is a popular crossover SUV known for its spacious interior and comfortable ride. We Can Help with Any Health Concerns Our Toronto and Victoria, BC Customers May Have. Located in Victoria, we carry a wide range of vitamins to help you feel your best. Little Steps more See more text. Now you hit the road, and the air conditioner starts working. What Type Of Freon Does My Car Take? The most common causes that hinders normal operation of air conditioning system on your Toyota Highlander are dirty cabin air filter, refrigerant leak, dirty or clogged condenser, dirty or clogged evaporator, bad blower motor, defective compressor, faulty blend door actuator or any fault in the electrical system Prostaglandin analogs increase the outflow of fluid from your eyes to lower the fluid pressure . How, The Ultimate Guide to Solving Chevy 6.0 Oil Pressure, Chevy Transfer Case Interchange Chart [Everything you need, Most Common Problems With Chevy 305 And How To Solve Them, P06DD Chevy Silverado| Empower Your Engine with Expert, Silverado Truck Gun Holster for Maximum Security and Convenience, Chevy Express Factory Trailer Wiring | How To Install Factory Trailer Wiring, Lets Get You On The Road / Chevrolet Silverado Shift Cable Problems [Solved], Revolutionize Your Chevy Silverado Cruise Control Troubleshooting Skills, The Mighty Workhorse: Chevy Silverado Payload Capacity [Everything You Need to Know], Mass Air Flow Sensor Chevy Silverado [Cleaning, Replacement, & Maintenance], Symptoms of Low-Pressure Drops in the AC of a Chevrolet Equinox, Warning lights or error codes on the dashboard, Causes of Low-Pressure Drops in the AC of a Chevrolet Equinox, Issues with the AC compressor control module or sensor, How to Diagnose Low Pressure Drops in the AC of a Chevrolet Equinox, Inspecting the compressor and compressor clutch, Checking for blockages in the AC lines and condenser, Testing the AC compressor control module or sensor, How to Fix Low-Pressure Drops in the AC of a Chevrolet Equinox, Replacing the compressor or compressor clutch, Clearing blockages in the AC lines or condenser, Replacing the AC compressor control module or sensor, Prevention and Maintenance of Low-Pressure Drops in the AC of a Chevrolet Equinox, Periodically inspecting the AC system for leaks or blockages, Scheduling regular maintenance for the AC system. Our vehicle air conditioner has two main parts. I bypassed the hi/lo pressure valve by jumpering 1 & 2. Fort most services, you cant just do a quick one and get out of there. They refer to the gas in an air conditioner as refrigerant. It may not display this or other websites correctly. Try our new Category View for Detailed topics segregated by their topic. At 85 degrees Fahrenheit, R134A shows a pressure of around 90 pounds per square inch. When your vehicle is at high speed, your condenser does not need the fan to cool down the Freon because enough air is passing through it, but without moving, it is fully responsible for this action. Wait about 20 mins and flush the compound out with a shop air; a shop compressor is preferable. Personally, I would try to find a compressor locally. Static pressure readings only indicate when your system is empty or has refrigerant. On hot days, people set their AC to cooler states; the more your higher the pressure on your compressor to maintain this cooler temperature. There is a relationship between the pressure in a closed AC system (compressor not running) and temperature. Here's the updateI put the electrical connection back on the pressure switch and tried adding a little R134 to the system. Pressure that is too much lower or higher shows there is a problem. Your #1 source for supplement and wellness product needs since 1989. Thanks folks, looks like I need to focus my investigation elsewhere. When you need to check your AC recharge, AutoZone will always be helpful; they use R134a refrigerant, AC stop leak, PAG46 oil, AC system cleaner, and so much more. 2. When any line on an air conditioner system is opened, air enters the system. Common causes include an over-pressure system, as described above. You can use an ac pressure chart to know if you have a good reading.