Question about 1999 Pontiac Montana

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No rear heat in pontiac montana '99

The back fan but no blowing warm air just cold air

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Warm up vehicle, then access heater pipes that run to rear of vehicle.  they should be HOT. if not you have  a circulation issue.  IF they are hot, then the blend door is not in the correct position.  this door directs air across a hot or cold core to create the correct air temp. check and update me.  

Posted on Jan 05, 2009

  • Bob Magrowski
    Bob Magrowski Nov 25, 2013

    Pipes hot,does is always tend to be blend door problem?Can I test anything with access panel off?Or do I need to take trim panel off?

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