My vw passat heater blows cold air

Asked by Sep 29, 2013 at 07:19 AM about the 1999 Volkswagen Passat

Question type: Maintenance & Repair

The pump thermostst and radiator have been changed and heater core is ok. I,ve bied it
and the heater fan works fine

2 Answers

5,105

You may think the heater core is okay, but if someone used a quick-fix stop leak additive on that radiator prior to replacing it, the heater core may be clogged. Also, verify the heater control slider is actually working the bypass valve properly.

3 people found this helpful.
40

Scott is right, be sure to check both coolant lines for the heater core that they are equally hot. Burping all of the air out of the cooling system on your Passat is also a real challenge. Have you run the car through multiple heat/cool cycles?

2 people found this helpful.

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