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Coolant Smell - Only On Start - No Leak

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I'm wondering if anyone has experienced this before...

When I start my 2000 Boxster S I smell a bit of coolant in the air for a minute or so. Not sure that if it is coming from the exhaust or the engine compartment, but I have no visible leaks and the system loss is less than 1/2 cup over 2-3 months of daily driving. I've had this 'problem' since I bought the car used last summer.

Obviously I'm concerned about it being a major repair or damaging the engine, etc.


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Thanks Loren,

The cap's part number does end with a 0, but it and the top of the resevoir are bone dry. Is it possible that the coolant system pressurizes on start and the cap very quickly starts working 100%?

I can try to get a replacement cap but I can't imagine not feeling some residue in that area if this was the case...

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Loren - you were absolutely right. :clapping: New coolant cap = no smell on start + no fear of a greater problem.

I just couldn't believe that there wouldn't be some residue associated with the old cap leaking for 30 seconds while pressure and temperature rose on start!

Thanks so much for you help.

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