Robert;
It sure sounds like a possible/probable pressurizing of the cooling system due to a compromised headgasket...after only 5-6 seconds, there just isn't sufficient heat to boil coolant and make pressure that way...sorry to be the bearer of bad news...but I agree with other poster, before removing head, I'd recommend a pressure test of the cooling system...
RJ; TNX for reference...I tried link and it gets one to the Service Notes page, but not down to the cooling system Bookmark...I've noticed this for a while now...there's obviously some issue with the bookmarks (the site is constructed with Front Page)...maybe some expert out there can shed some light on this...WWW is not much help, which is dissapointing...
Good Hunting
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