coolant leak - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Cunningr · 06-07-2018, 08:47 PM

If inside carpet is dry probably the cap. I had some overflow last year cause the service was done in oct. Fluide was on max, so when hot weather hit 42c had some overflow, stopped after it dropped a bit below max.loose or cross threaded cap will cause it to over flow some also.

BirdDog · 06-07-2018, 10:26 PM

I'll chime in with probably the cap, especially if the part number on the cap doesn't end in -04. If it doesn't, change it anyway. It's cheap (under $15). If you get it at a local Porsche dealer remember to ask for your PCA discount.

Also be careful when installing the cap. The same thing can happen if the cap isn't screwed back on quite right.

Starter986 · 06-08-2018, 04:52 AM

Thanks, NA. Hadn't considered that valve/o-rings as a wear item. Nice to know.

I did fail to reveal that I replaced the cap with the current part.

Man, I love this forum.

pilut2 · 06-08-2018, 10:32 AM

Quote:

Originally Posted by Starter986

Thanks, NA. Hadn't considered that valve/o-rings as a wear item. Nice to know.

I had a similar coolant dump that was caused by a crimped o-ring in the pressure relief valve. I sourced a replacement locally for $5. As others have noted- it is a 5 minute job to take the valve apart to inspect the O-rings- there are two. Just be careful not to strip the screws when you re-assemble it.