knoll5150
05-22-2008, 09:19 AM
Have a strange issue, that I hope someone can help me with: Last year I changed the coolant on my car at a Penzoil shop. I had them switch from the Dexcool to the regular green antifreeze to save a few bucks (it was actually $30 cheaper at this place!). They said it would be fine, as long as you don't mix the two different coolants, and realize you'll have to change the green stuff more often. The car ran fine last year, however this spring about a month after taking my SS out of storage, I've noticed on three seperate occasions, after parking the car, I here a strange bubblng noise (almost sounds like an old coffee pot perculating!) coming from the engine, and a second later coolant comes bubbling through the reservoir cap (the black cap where you fill coolant through, not the metal cap over the radiator)! It bubbles up about 12 oz. of fluid, then stops. The weird thing is, this happens randomly (sometimes after long drives, sometimes after short city driving) so most shops can't fix it unless they see the issue. I did get the oil changed a while back this spring, and maybe the guys there put too much coolant in. There are no other leaks on this car, and the engine temperature never goes above the normal 200 degrees. Any ideas?