2001 Volkswagen Passat Logo
Posted on Dec 17, 2008
Answered

My heater is blowing just air, but no hot air?

My AC works fine.

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  • DBYERS1979 Jan 02, 2009

    MINE STARTED WHEN I REPLACED THE BATTERY

  • DBYERS1979 Jan 02, 2009

    MINE STARTED NOT WORKING WHEN I REPLACED THE BATTERY

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  • Contributor 46 Answers
  • Posted on Dec 28, 2008
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Joined: Dec 26, 2008
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Check to make sure that hot water is making it to and from your heater core. There are usually two lines that direct water (coolant) to and from the firewall from the engine (not the A/C) system. These lines are usually heater hoses.
If both of the lines are hot, there's a problem with the blend door, or an electrical fault in the controls or wiring. If one line is hot and the other one cool, your heater core is either plugged or had an air pocket. The latter will require bleeding the cooling system and the former will require replacing the heater core, (not a job for the faint of heart). Also, check the thermostat to make sure it didn't fail in the open position.

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