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Originally Posted by Greg M
Oh, okay, that was helpful.
Still sounds like you could be developing a head gasket problem since you've had it in for service but now its steady. Mine was shot when i bought it, and i had air bubbles and occasionlly it would build up enough to overflow the expansion tank onto the ground. Do this - start your engine from cold, take the cap off the expansion tank and watch for bubbles. There won't neccessarily be a constant flow but rather an regular "burp". If you see any, i can promise you that you have a headgasket problem. Take it back to your mechanic and have them do the test to confirm.
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when you start from cold and are looking for "burps", how long should you wait before you start to see bubbles? I looked at my expansion tank for 3-5 minutes and no bubbles. This must be a good thing. I have a faint coolant smell inside the truck(88RRC 144K miles) when I'm driving it. Must be a leak somewhere externally.
