Coolant overflow, ideas?

[Chuck W.]

Had a similar experience. Ends up it was the coolant cap. I had the original one that ended in .01 and replaced it with the latest one ending in .04.

[Tom Mohr]

Originally Posted by Chuck W.

Had a similar experience. Ends up it was the coolant cap. I had the original one that ended in .01 and replaced it with the latest one ending in .04.

Thought I would validate that I'm on track. Small stream suddenly appeared. Thought the worse. Removed undercar plastic shield only to discover dribbling out of overflow tube. See photo: some condensation, none on carpet. Cap says Germany, no part number. So I need a cap, should I replace bleeder valve too?

[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.