Question about 2001 Pontiac Montana

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Pontiac montana heater works but doesnt blow heat out on defrost

It doesnt blow very well and turn it to other settings it does the same thing.

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  • hlittlewolfe Jan 15, 2009

    I have the same problem and my windows frost up on the inside my heater does not blow enough air through there is alot of heat coming just not enough air flow

  • Anonymous Jan 16, 2009

    no heat, why?

  • adfrench Jan 30, 2009

    I have the same problem. Also, my fan did not work on #1 and #5. I replaced the 30 amp HVAC High Blower fuse located in the passenger side fuse panel as well as replaced the blower relay (located on the passenger side under the dash), which resolved the fan issue. However, even with the fan on high and the temp set to the hottest level, the windows frosted quickly. No interior coolant smell, which is normally the sign of a bad heater core.

  • adfrench Jan 30, 2009

    Correction to my post above: I replaced the blower resistor. It was a $49 part and took about 20 minutes from start to finish.

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If the heater core is good and the blower works, the valve doors may not be opening and closing properly to direct air towards the proper vents. This may be because something has fallen in and is obstructing their movement. The actuating motors may not work properly, or the linkages that connect them to the mode doors may be worn or improperly adjusted. You can get a look at the mechanisms by removing the driver side knee bolster (two screws) and a lower trim panel on the side of the center console.

Be careful fiddling with the linkages. Everything is plastic and easy to break, and replacing the heater box requires removing most of the dash.

Posted on Nov 17, 2009

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This is most likely the pollen filter. the access door is in the back of the glove box. It is probably clogged and restricting air flow. To test remove the filter and see if there is a significant increase in heating and air conditioning air flow.

Posted on Aug 28, 2009

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Where are the heater flaps on a 2000 pontiac montana

Posted on Dec 21, 2009

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