Coolant overflow, ideas?

[JohnENC]

I had the same problem, but hadn't touched the coolant level in weeks. It leaked a gallon or more within a couple minutes of parking. I refilled the tank the next day to troubleshoot and once it reached operating temp, it leaked from the fill cap. After observing the leak for a few seconds, I shut down the engine and within a minut, another half gallon or so of coolant rapidly leaked from the fill cap. I have a replacement cap on the way, but why does it gush only AFTER the engine is shut down?

[ike84]

Originally Posted by JohnENC

I had the same problem, but hadn't touched the coolant level in weeks. It leaked a gallon or more within a couple minutes of parking. I refilled the tank the next day to troubleshoot and once it reached operating temp, it leaked from the fill cap. After observing the leak for a few seconds, I shut down the engine and within a minut, another half gallon or so of coolant rapidly leaked from the fill cap. I have a replacement cap on the way, but why does it gush only AFTER the engine is shut down?

Heat soaking of the system without air moving through the radiators.

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[Homeoboxter]

Originally Posted by ike84

Heat soaking of the system without air moving through the radiators.

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And less heat dissipation becuse of the lack of coolant circulation.