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1983 300SD
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8 Posts
Discussion Starter #1
So I was going out today and before I unlocked the car I found coolant dripping from the overflow tank. Popped the hood and realized I left the cap on top of the expansion tank and was sitting there for about 3 weeks. Im guessing since the cap wasn't on, insufficient pressure wasn't able to cycle through?
 

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w126
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1,535 Posts
It's not clear what you mean by "the pressure cycling through". Removing the cap lowers the boiling point of the coolant and allows loss through evaporation.

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