Question about 2003 GMC Envoy

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2003 GMC Envoy Heater Fan doesn't always blow

Sometimes it works fine, but only on high speed. If it doesn't work at all I can usually get it going by turning the vehicle on and off several times.

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  • GMC Master
  • 641 Answers

Your problem most likely is the resistor block. In order to limit the fan speed a reistor is placed in the circuit which will limit current flow to the motor thus giving you the diferent speeds. High speed bypasse the resistor to get full motor speed. Since you only get high speed it is very likely that the resistor block is faulty

Posted on Oct 27, 2012

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: 2003 GMC Envoy lower 3 heater fan settings quit working.

had same problem on my XUV. changed the blower motor resistor, located under passenger side dash. easy to change, works no problem.

Posted on Feb 17, 2009

  • 1114 Answers

SOURCE: blower dosent blow on high

fan blower speed switch under hood usually in fire wall or in heater box under dash area if you do not change it you will keep losing all your speeds until nothing left! it is not!!!!the one in your dash that you hand operate! hope this helps.John

Posted on Jan 24, 2009

wireguy212
  • 1627 Answers

SOURCE: 2003 GMC envoy heater fan motor will only work on

You need to replace the blower motor resister to get the other speeds back.

Posted on Dec 16, 2009

  • 1 Answer

SOURCE: my 2003 gmc envoy heater

Did you happen to find out what the problem is. I am having the same issue?

Posted on Feb 23, 2011

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fan blower speed switch under hood usually in fire wall or in heater box under dash area if you do not change it you will keep losing all your speeds until nothing left! it is not!!!!the one in your dash that you hand operate! hope this helps.John

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had same problem on my XUV. changed the blower motor resistor, located under passenger side dash. easy to change, works no problem.

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