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Originally Posted by DougG
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.
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It can take a good while before the thermostat opens. LR electric temp guages are so worthless, you can't see the "event" but a good mechanical guage will go up, above operating temp, then suddenly drop below when the thermostat opens. The bubbles will not be huge burps, but fine fizz.
The coolant you're smelling inside the car may be from a leaking heater core. Personally, I'd rather do a head gasket job than a heater core any day of the week.
