Question about 2002 GMC Envoy
Check the fan by putting 12 v on it.then check with a test light and see if the relay has 12v
Posted on Jul 18, 2009
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Posted on Jan 02, 2017
rickalber: The fan motor switch is within what GM refers to as the HVAC control unit. This is located in the dash, You actually touch part of it, which are the knobs.
Looking at the flat rate guide, it shows 4 tenths of an hour to change the part out and the part retails for $142.58
Are you sure you need this part?
What are the symptoms?
If the blower runs but only has high, it is not the switch, but the blower resistor! That part cost $24.00 but takes 8 tenths of an hour to replace according to GM.
Make sure of your diagnosis before replacing a part. All too often, I see people throwing parts at problems and spending small fortunes on simple problems. Had they only waited and gotten professional help.
I had a customer bring his car into my shop after he had spent untold hours trying to fix his car and nearly a thousand dollars in parts.
After listening to his discription of the problem, it took all of 5 minutes to pin the problem down and fix it. We found his problem which was a loose ground wire on his intake manifold which affected his fuel injection system. We happened to specialize in this product and the problem was quite common!
CAN YOU SAY HOPPING MAD?
We charged him about $50.00! He has learned a very expensive lesson. Mind you, this doesn't mean you shouldn't try to fix your own car, but make sure it is something you can handle and if the tech says he/she thinks it may be better addressed by a professional actually working on it, take their advice.
Posted on Apr 20, 2009
Your switch acts as a reastat which adjusts your speeds your switch is going bad so you only have the two speeds left on that reastat.. thanks Jerry
Posted on Apr 22, 2009
SOURCE: 2006 Trailblazer AC fan
I believe you must be talking about the inside blower fan tht is not coming 'on'.
It could be the switch tht operates the fan, remove the switch and check for live wire if theres current over there, if theres current thn operate the switch and check other ports for continuity of the current flow.
Its better first though to check the fan itself, it could be faulty or jammed or the brushes wornout.Remove the fan and you can test it out with the help of the car battery and two pieces of wire one to + and the to - , if the fan works thn you will have to proceed further as mentioned above.
Hope this helps.
Posted on May 10, 2009
you have a short to power which will cause it to stay on constantly check your blower motor resistor pack to ensure that it is working and check the wires going to the blower to make sure you have a power and a ground
Posted on Jun 29, 2009
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