Question about 2002 Pontiac Montana

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2002 pontiac montana. where are the relays for the hvac blowers. the front and rear blowers dont work I have already replaced the resisitor in the front blower. there are some relays behind the glove box on the right side of the dash on the side and I have already checked them or what else could be the cause? I have replace the circuit breaker in the fuse box in the cab and checked fuses inside and under the hood. the blowers work sometimes which makes me think it is a relay but can't find them. they are not behind the heater and ac controls either any ideas?

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  • Randy Kruid
    Randy Kruid Aug 11, 2013

    The new ignition switch fixed the problem

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  • Pontiac Master
  • 5,332 Answers

I think these two problems have a common solution. When they do not work check for power at the HVAC Blower Fuse in the instrument panel fuse block. Check this with a volt meter. You should see battery voltage at the fuse. If you see no voltage or very little than I would bet you have a bad ignition switch. The switch is what supplies power to the fuse.

Posted on Jul 22, 2013

  • 10 more comments 
  • Randy Kruid
    Randy Kruid Jul 22, 2013

    I think if it was the ignition switch there wouldn't be power to the radio or the rear wiper or fog lamps. Also when the blowers quit the other hvac controls don't work either. At the parts store they have 2 relays for the hvac but I cannot find there location I think it acts like a weak relay

  • Randy Kruid
    Randy Kruid Jul 22, 2013

    I think if it was the ignition switch there wouldn't be power to the radio or the rear wiper or fog lamps. Also when the blowers quit the other hvac controls don't work either. At the parts store they have 2 relays for the hvac but I cannot find there location I think it acts like a weak relay

  • Jeremy W.
    Jeremy W. Jul 22, 2013

    Yes you ar partially correct. There are several circuits that the ignition switch is responsible for. One of them feeds power to just three fuses. The DRL/HVAC/HTD fuse, the front HVAC fuse and the rear HVAC fuse. If this circuit burns up in the switch you will have no power to these three fuses but continue to have power to the rest of the vehicle.

  • Jeremy W.
    Jeremy W. Jul 22, 2013

    Check for power at those fuses. They are fed by the ignition switch. There are no relays between the ignition switch and the fuse. If there is no power than the ignition switch is the issue. It's pretty common on GM models.

  • Randy Kruid
    Randy Kruid Jul 22, 2013

    Ok I was wondering if there were several accessory circuits controlled by the ignition. I will check for power at the fuses also would the ignition switch be located down on the steering colum? Since the key is in the steering colum

  • Jeremy W.
    Jeremy W. Jul 22, 2013

    The ignition switch will be on the other side of the column from where you insert the key. Once you drop the column covers you will see it on the left side of the column. I can get ou the wire colors to check at the switch if you need them.

  • Randy Kruid
    Randy Kruid Jul 28, 2013

    Thanks for your help I checked the fuse yesterday and no power to the fuse but there is power to the circut breaker I didnt have a lot of time to work on it. Its my daughters van and she lives 30 miles from me and also in the process of moving her I will get a chance maybey sometime this week and I should have be able to work on it next weekend I also should remove the hvac control panel and see if there is any power there because there may be a chance its the control panel circuts but I should check the ignition switch 1st. why would there be power at the breaker but not at the fuse?

  • Jeremy W.
    Jeremy W. Jul 28, 2013

    What breaker? There's not a circuit breaker on those circuits. I'm not sure you are sure of what you are checking. If there is no power at those three fuses and since power has to go through those three fuses to get tot the control head, why would you think there would be power at the control head?

  • Jeremy W.
    Jeremy W. Jul 28, 2013

    I think it would be a good idea to swing buy the library and get a copy of the wiring diagram for the HVAC circuit. Also one for power distribution. Most libraries have a free automotive database that you can get all this info for the cost of the printing paper. This is not a hard diagnosis and would take an experienced tech maybe 20 minutes tops to figure out. You need to go to the ignition switch and see if the wire for the HVAC supply circuit has power. If it does not replace the ignition switch. It's that simple.

  • Randy Kruid
    Randy Kruid Aug 11, 2013

    There is a 30 amp breaker labled FRT HVAC BLWR thata why I wanted to check for power at the control panel no power at the fuses I did put a new ignition switch in and it fixed the problem Thanks

  • Jeremy W.
    Jeremy W. Aug 11, 2013

    Sweet!

  • Anonymous Nov 06, 2013

    I don't want these problems to happen to me. Where is a great place to learn aboutHVAC in Kansas City?

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