Visit to find out more about your car’s mobile A/C and engine cooling system.Ġ responses to “Why pressure test an engine cooling system?”Īnalytical cookies are used to understand how visitors interact with the website. You can E-mail us at or visit to find a Mobile Air Conditioning Society repair shop in your area. Insist on recovery and recycling so that refrigerant can be reused and not released into the atmosphere. When having your mobile A/C system professionally serviced, insist on proper repair procedures and quality replacement parts. If no external leaks are found, always consider the possibility of a failed head gasket allowing coolant leakage into either the cylinders or the oil passages. If the pressure drops, then check the system for leaks. The system should hold pressure for two minutes. After the pressure is reached, shut off the shop air. Connect the shop air and increase the regulator setting to the pressure rating for that system. To test the system using shop air, install the adapter with the pressure probe. If the cap releases early or late, or does not hold pressure, replace the cap. The cap should be able to hold this pressure for approximately one minute. Note the reading on the cap to see if it is releasing at the proper pressure. To test the radiator cap with the hand pump, attach the cap to the pump using the proper adaptor and operate the pump until the cap starts to release pressure. The system should hold pressure for at least two minutes. Slowly apply pressure to the system up to the range of the system or the range shown on the radiator cap. Attach the pressure tester to the adaptor. Use the correct adaptor and connect it to the filler neck. To test the system using a hand pump tester, make sure the radiator is full. Shop air or simply the pressure generated by the coolant system can be used to measure the pressure and check for leaks. A third style has an adapter that replaces the radiator cap and allows a pressure or temperature probe to be inserted. Another style of pressure tester uses shop air connected to the coolant overflow hose. The most common pressure tester is the hand-pump device with adaptors to fit different size caps and the filler neck of the radiator. ("Scripps").Pressure testing is used to check for leaks in the cooling system and to test the radiator cap. "Don't Waste Your Money" is a registered trademark of Scripps Media, Inc. Of course, if you want a full diagnosis, by a certified ASE auto mechanic, you're not going to get that at an auto parts store.īut for basic issues it might be worth trying them so you don't waste your money. So your best bet is to pull over to a safe spot and call for help. In both cases do not keep driving, or your engine could possibly seize up. Two is the red oil-can light. This means your oil level is dangerously low.It's a red thermometer that means your motor is low on coolant and overheating (or has a leaking head gasket, where coolant is running into the oil). No AutoZone nearby? Advance Auto Parts, O'Reilly and Pep Boyswill also perform many of these services for free, so be sure to ask.īut there are two dashboard lights where you should not try to drive to an auto parts store for a free check. Read the codes on your check engine light.Many drivers don't realize that AutoZone,the nation's largest auto parts chain, will do the following services free of charge: It can cost $200 at the dealer just to have the problem diagnosed.īut you may not realize you might be able to get that problem checked for free at AutoZone or your other local auto parts stores. You know it's going to be a bad day when your car struggles to start or the check engine light comes on.
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