Had something similar to this happen this spring. It turns out that the Coolant cap is a little sensitive when screwing it back on. You may be installing it incorrectly which does cause it to burp coolant when shut down. The threads are fine which may make it harder to screw on correctly. Once I reinstalled it the "burp" disappeared as I was instructed to by my friends Indy P-Car shop.
Just another thing to check out.
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2002 Boxster S Seal Grey
2010 Ford F150 FX4 Luxury
Retired after 38 years with the same company.
Last edited by Jaak; 08-27-2012 at 08:38 PM.
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