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Recreational Mechanic
Join Date: Sep 2000
Location: Northern Colorado, USA
Posts: 3,326
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Quote:
Originally Posted by Mike Billings
I've pressurized the system to 30psi to track down an intermittent leak that would not leak for me at 20psi. No problems. I figure the vacuum lift system uses -30psi.
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The Airlift uses negative 24-26 psi. I too have used it many times with no problems.
I have also used the pressure drain method without any problem. I'm not sure what you could really damage... The system is rubber hoses, aluminum pipes and radiators, and the aluminum block. Only thing I can think of is if the heater core uses press fit o-ring connectors too much pressure too fast could blow it out.
If you blow out a hose at 10psi then you have bigger problems going on than just needing to replace old coolant!
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Last edited by Nickshu; 12-27-2017 at 08:01 AM..
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