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Volkswagen Passat Turbo Issues
A quickie oil change place fouled the G12 coolant several years ago with green stuff... I replaced the coolant with new G12 about two months ago, and the problem soon started.
I'm wondering if running bad coolant could have corroded the radiator and caused this problem... Strangely, when I run the heater to cool the engine down, it sometimes blows cool air, even though the engine is hot... Might circulation through the radiator be an issue?
I'm also wondering if -- even though I don't have oil and coolant mixing, or power loss -- if an exhaust leak through the head gasket is causing the problem. The mechanic I usually rely on -- not the dumba** who did the water pump -- seems to like that one.
Anybody have any ideas?