![]() Overheating Engineįailing radiator caps that cannot sustain sufficient pressure lower the cooling liquid’s boiling point causing inadequate heat absorption from the vehicle engine. How to Pressure Test the Cooling System is licensed under a Creative Commons Attribution-NoDerivatives 4.0 International License.You can tell that you have leaking coolant from visible colored deposits when you open your car’s hood or liquid sprays from the coolant hose. Any image seen with this article is the property of it’s respective author and requires it’s own permission. There must be an active “follow” link to. Permission is granted to republish this article (text only) for personal or commercial use as long as the content, citation, and copyright notice all remain intact and unchanged. How to Pressure Test the Cooling System is an original article from Crawford’s Auto Repair. We’re certified technicians with over 35 years of combined experience and we treat each vehicle as if it belonged to our own mother. We offer free shuttle service, free quotes and a price match guarantee. If you live in the area and would like just such an offer, Crawford’s Auto Repair is located at 2855 S Alma School Rd, Suite 107, Mesa, AZ 85210. Also, if you pressure test the cooling system at home and you’re not experienced in repairing the cooling system, then you may need a trusted professional nearby to help you repair it. If you prefer to have a professional auto technician pressure test the cooling system, then you may be able to find one that offers free quotes in order to avoid the tool rental fee. This should be checked by a professional. A cooling system flush and/or repair of a leak in the cooling system may not correct an overheating issue with the engine.A cooling system flush can be performed about every 100,000 miles on modern vehicles or sooner if the coolant is dirty upon inspection.Never open the cooling system when the engine is hot.Other items to remember regarding the cooling system: If the pressure does go down, then you need a new cap. If the pressure does not go down, then the cap is in good shape. If no leak is immediately noticeable, then it doesn’t hurt to leave the pressure applied for a few minutes. If there is a leak, then it may be more immediately noticeable. Pump it by hand to the pressure indicated on the cap, the same way it was performed when pressure testing the cooling system. You’ll apply the adapter to the tester, then the radiator cap to the adapter. There should be an adapter that comes with the set. If there is less pressure than before, then there is probably a leak.Īfter attaching the pressure tester to the cooling system, you’ll also want to pressure test the radiator cap. Then inspect the entire cooling system for any leaks and check the gauge on the pressure tester for a change in pressure. Let the vehicle sit with this pressure for 20 – 30 minutes. Typically on a modern vehicle this pressure is between 13 – 16 psi. Generally, it attaches to the radiator where the radiator cap goes, and you pump it by hand until the pressure on the gauge matches the pressure that is written on top of the radiator cap. If you don’t own one, then rent one from your local auto parts store. ![]() You’ll use a cooling system pressure tester. The pressure test can also be done any time a leak is suspected. This is commonly the next step after performing a cooling system flush. Standard Checks at 30K, 90K, 150K MilesĪny time you open the cooling system and put it back together, you’ll want to pressure test the cooling system to check for any leaks.
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