Originally Posted by
Altec-Racing
It seems like there are two different issues going on here
1. low/no heat at idle and city driving.
2. Water temp drop while under load.
Definitely two things going on. I've got problem #1.
Had the thermostat changed first, no dice, and then I noticed I was losing coolant. Searched around and found an Audi Technical Service Bulletin, tag line "coolant leak or no heat", blames it on a plastic plug in the cylinder block, near thermostat housing, that is faulty under 0'C (about -25'C here lately). Had that checked out, found some leakage so it was changed last week. Up to now seems leaking has stopped but heat gone again after a couple days. Could it be air leak or plugged up heater core?
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