same thing is happening to me and i have the same miles as you and the same motor. im about to do the thermostat on mine to hopefully fix it. I have a new radiator, cap & hoses and have never had head work done. replacing the decade-old thermostat i HOPE fixes it and if not, then its on to intake manifold gasket. i have no answers for you but your post discouraged me lol. i havent even had the work youve had done. it seems like replacing things on our aging cooling systems only re-directs the the issue to the next weakest link and its only a matter of time before a head takes a crap.
dunno if youll see this post, but if u do, did u ever get the issue resolved?
or did your coolant just turn brown one day?
Last edited by gts007; 06-08-2011 at 10:29 PM.