Thread: Coolent leak
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Old 12-23-2012, 07:30 AM   #17
JFP in PA
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Join Date: Feb 2005
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Quote:
Originally Posted by shadrach74 View Post
So if the tank cap will not hold pressure, is the overflow diverted out of a drain hose like a conventional cars radiator cap diverts to an expansion tank?
Correct. The system has a drain line that runs downward under the car, where the coolant will blow out. These caps are supposed to hold around 18 PSIG, but often "pop" as low as 8-10 PSIG when they get older. That is why we always test them on any car in the shop.
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