Do i have thermostat issue or waterpump
One qualification. Is this a really recent problem? Is it REALLY cold there? Is there enough antifreeze in the coolant?
After engine running for 15 minutes while driving; is the coolant hose from the top of the radiator hot? If so, good. if not, a blockage or thermostat issue.
If good in previous step, Inspect heater control valve for proper operation. Scan with VCDS. Repair as necessary.








