Quote:
Originally Posted by Wayfarer
The pressure test is warming the car up and then leaving it sitting overnight. If the cooling system holds pressure 12-24 hours, it is likely from a cracked head or internally leaking head gasket. It should slowly release pressure as it cools. My car passes this test,<>
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I realize this, but it is far from a conclusive test. My point is that since your coolant system has a leak, it is likely to leak all pressure out through that leak, so it would never hold pressure overnight without replacing the head gasket or whatever is leaking.
Your car can not fail this test.