1990 Camaro IROC 305ci. I don't notice bubbles when the engine is running, but if I shut off with the engine hot around the temp when the fan would come on to bring temps down, a minute later I can hear bubbles. Usually starts about a minute or two after shutting the engine off, and it starts with little small bubbles, but then gets really into it with fast big bubbles. Lasts for only a few minutes.
I know it could be a head gasket, but we did a check for carbon monoxide in the coolant but it showed negative.
I know it could be a head gasket, but we did a check for carbon monoxide in the coolant but it showed negative.