For 2000 Passat Wagon AWD w/ Auto Temp. AC works fine, but when I turn the thermostat up into the high 70's and mid 80's, the air coming out is luke warm at best whether using the "Auto" mode or "Econ" mode. Water temp is solid at 190 degrees. Any ideas?
You should have overheating or coolant leaking into your interior if the heater core was at fault. Either of those issues occuring?
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