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Old 04-13-2021, 10:26 PM   #8
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Join Date: Aug 2018

So I decided to switch the green coolant reservoir cap to a spare black one I had. All of a sudden no more leaks?! It was also 62F outside vs. like 32F that last time I turned on the car which makes me wonder if the cold is causing the mushroom seal to contract and cause the seepage. The green cap says 150kPa and the black one is at 75kPa.

What's the consensus by the gurus here on which cap to run? Is black cap the way to go or should I switch back to the green cap?

Last edited by 240-FAN; 04-13-2021 at 10:45 PM..
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