Question about 2001 Volkswagen Passat

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Heater Only Producing Warm Air

I have a 2001 Volkswagen Passat. The blower works fine, but the air won't heat up. Even after driving for a while, the air only gets warm at best. Thoughts?

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  • IgorSmirnov Feb 05, 2009

    After cooling system repair at the dealer's (gasket, hoses, temperature sensor, wiring were replaced) the heating system stopped working (the day before everything was just perfect). After driving about one hour at 65 mph there is some warm air can be felt, but looks like it's just because the engine gets hot. Ventilation and AC are all right.

  • Anonymous Mar 26, 2014

    blower works but no heat

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I had the same problem and remedied it by disconnecting the heater core at the firewall (you have to remove the plastic shield by the windshield to access) and filling the core with radiator flush. I let it sit for 4-5 hours and then flushed the core with water from my garden hose. To make the connection, I cut a rubber washing machine supply hose, which fit inside the tubes to the heater core.

Once flushed, I added "Water Wetter" to remove any air bubbles from the system. heat now works great.

BTW - both the dealer and and independent said I needed to replace the heater core, at a cost of $1500. Glad I tried this first! Good luck!

Posted on Feb 02, 2009

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A hotter thermostat would probably help....the one in your motor may be defective, and not working properly. If the thermostat is stuck open, you engine runs at lower operating temps., and only produces warm air.......

Posted on Jan 31, 2009

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Posted on Jan 02, 2017

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