Blower motor doesnt work

I would check the blower motor first, make sure it is getting power.

The burnt wire's ,are they in the connector that plug's to the control switch ? High resistance ,loose fit cause's this . If the motor works on high the switch isn't the problem , The blower motor resistor is . On high the power flow bypasses the blower motor resistor to ground . Do you know what a blower motor resistor is ? The switch just supply's a path to ground through the different resistances to create different speeds. Your switch probably is not bad . But rather then guess use a ohm meter an test it. Do you know what a wiring diagram is ?
Free wiring diagrams here http://www.bbbind.com/free_tsb.html Enter vehicle info. year , make , model an engine size ! Under system click on HVAC ,then under subsystem click on HVAC control's .Click the search button then the blue link . Here watch this video . Blower Motor Problems Auto Repair Help Your blower motor circuit is a little different . Learn to test an not guess or take it to a qualified repair shop.

normally it is the resistor,( relay) then resistor module then motor.
did you test the relay(I believe located under hood, relay/fuse center), If OK check plugs and wires for melting, damage and good connection, grounds should also be checked. Use a volt ohm meter to see if you are getting any power ti motor,etc.
the first link below gives good how to diagnose blower,press the helpful button
GM Blower Motor Resistor Diagnostics by Wells

DIagnose and Replace GM blower Control Module

http://www.gmcproblems.com/tsbs/Envoy/2003

Wiring problem of the 2005 GMC Sierra 1500 6 Failure Date: 07/18/2009

The connector that plugs into the blower motor under the glove box became too hot and melted the plastic resulting in the a/c and heat not to work (this includes the windshield defroster). I've been looking up problems and solutions and found that this is a recurring problem with GMC and chevy trucks yet there has not been any recall, in fact the dealerships have an extremely overpriced kit to fix their faulty wiring. About 66,000 mi.

Hi Roody, Im glad to help!

Usually when a blower motor is working one moment and not the next the "Blower Resister" is trying to go bad, make sure you also check the connector to see if its burn't, if it is you can get a jump wire from Chrysler. The other thing I have seen is the "Connector" at the blower motor can burn up if there's to much resistance in the motor itself or a loose connection. If that the case, you'll need the motor and wiring. I've also seen where the control head is defective inside. HERE"S HOW YOU CHECK IT: The next time the blower quits working grab the blower speed knob and wiggle it, if the blower starts working again then you'll need a new control head. Hope this helps and have an awesome day Roody.

Hi Donna, I'm glad to help!

Donna, I'm not sure what you mean by relay switch, I'm assuming you mean the "Blower Relay" under the hood. In all my years working for Chrysler I can tell the biggest problem with the blower not working is usually the "Blower Resister". Here also is some things to check while replacing the part. When you unplug the connector at the resister look at it and make sure it is not burnt. If it is you'll need to replace it as well, the dealer has a new overlay wiring and connector you solder and heat shrink to the vehicle wiring. If it is not burnt then of course you just replace the resistor. One other thing to check out, is remove the connector for the "Blower Motor" and check to see if its burnt, if it is replace it in the same way you would the resister wiring and also replace the blower motor. If it is not burnt the your OK just trying the resister by itself and see what happens. I'm just down the road in Saint Peters, if you have any questions call me. I'm Allen 314-374-5218. Hope this helps and have an awesome day Donna.

there is a blower motor resister which controls fan speed i believe its located pass side of dash by blower motor has one plug about 5 wires red ,orange .blue yellow

if fuses are good, check for power at blower motor, when truck is running and a/c on. the resistor and the switch provide ground, so the blue/white wire should have power, and the blue/black wire should have NO power, if it does have power, then most likely the resistor is bad. if it has no power and the motor doesnt run, the motor is bad.

resisters, follow wire from blower to small electric piece in the duct near your blower motor.

Try checking for power at the blower motor. Not quite sure on yours, but a lot have the switch more or less grounding, with the power at the motor. Remove the resister assembly from the blower housing and check that the coils are not burnt. Quite often this resister needs to be replaced. Frankster016