Pressure testing cooling system, how long should it hold pressure? - Team Camaro Tech
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post #1 of 2 (permalink) Old Sep 30th, 05, 05:58 PM Thread Starter
Senior Tech
Join Date: May 2004
Location: kentucky
Posts: 889
Question Pressure testing cooling system, how long should it hold pressure?

I borrowed a pressure tester to test my coolant system. I have been doing a frame off, and installed new heater core, hoses, rebuilt my engine etc. I want to check for leaks before I install the front clip.

My question is after I pump the system up, how long should it hold pressure, and how much pressure loss would be considered normal? This tester didn't have any instructions with it.
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post #2 of 2 (permalink) Old Sep 30th, 05, 10:20 PM
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Join Date: Aug 2001
Location: san jose ca usa
Posts: 503
Re: Pressure testing cooling system, how long should it hold pressure?

It depends, if the engine is warm 1 psi drop every 3 minutes is considered ok (the pressure will drop as the coolant cools) if the engine is cold then it should hold for 10 mins or more.

70 Camaro, 355, th350, 4.10 posi.
74 Trans Am, 400, th400, 2.73 posi.
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