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Join Date: Oct 2014
Posts: 123
Bleed valve

Hi
Porsche 996 c4s just changed thermostatic/ pump /coolant car running ok. Temperature good.Only thing i notice is when came back from a run looked at coolant tank and the bleed valve was up ,When undone cat let some pressure out it went back down .Is this normal
Old 02-15-2018, 07:28 AM
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Join Date: Jan 2008
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Posts: 1,062
Yes, normal.
It is not a "Bleed" valve per say. It is actually a vacuum break that allows the system to reach atmospheric pressure by holding the seal open when the bail is snapped up as the engine cools down. This encourages air bubbles to migrate to the expansion tank and then out of the system.
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Old 02-16-2018, 05:39 PM
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