chevrolet avalanche no heat

[zombola]

hey guys and gals anyone know on how to repair or what is the problem the fan is not
not running so no heat or cold air is coming my friend can not drive his truck lately

thank you in advance:noidea:

[The Noof]

Blower resistors & their connectors are common problems,but if the resistor IS the culprit, it should still have the highest speed only.
If it has NO speeds,start by checking the fuse.The fuse box cover will i.d. the fuse or you.If it is good,check for 12v at the heater motor itself.IIRC it is easy to get at in the passenger compartment foot well.You can try tapping the heater motor with a small hammer while it's turned on the highest speed:if it turns on,you have found the problem.Lets try those things & go from there.

[runamok]

Do a search for chevrolet avalanche heater fan not working.First hit says check fan blower resistor.

[The Noof]

Do a search for chevrolet avalanche heater fan not working.First hit says check fan blower resistor.

Yes...but it will still have the highest speed if the resistor is the problem.The resistor is by-passed for the highest speed.

[zombola]

thank you for your Quick reply but go easy on me i have no idea what are talking about would you
have step by step and pics if possible
newbie here
https://s-media-cache-ak0.pinimg.com/736x/d4/47/ee/d447ee857bddfad45f6441dacf7f9cca.jpg

[bjim]

Yes...but it will still have the highest speed if the resistor is the problem.The resistor is by-passed for the highest speed.

I've had resistor go out twice on my 2002 Silverado, high speed was first to go, first time resistor went out, then second fastest went,then I replaced it, lasted a couple yrs, then started to lose speeds ,(don't remember which ones)replaced it again working still,very easy to fix yourself,resistor around $25-$30

[zombola]

I've had resistor go out twice on my 2002 Silverado, high speed was first to go, first time resistor went out, then second fastest went,then I replaced it, lasted a couple yrs, then started to lose speeds ,(don't remember which ones)replaced it again working still,very easy to fix yourself,resistor around $25-$30


would you be kind enough to take a pick
and post it thanks

[auggie]

This might help (www dot autorepairinstructions.com/archives/blower-motor-fan-speed-resistor)

[iq180]

What I have found is if the resistor is bad the fan motor is bad, the fan motor is pulling to many AMPs, that's what kills the resistor and 50% of the time you will find the wire plug is melted at the resistor and you will need to replace it as well.

[dukeathome]

Did the heater make any noises before failing,sqeeling or grinding sounds? Guys a bad motor can cause resistors to fail. Try not to run your fan on high speed it's hard on the motor

[bjim]

no noises,just speeds started to stop working, had to replace plug second time I replaced resistor, I have an old resistor that I had replaced, but not sure how to post pic, my camera probably doesn't work hasn't been used in years, can I do it with smart phone somehow?

[auggie]

Go to the website that i mentioned in post #8 by me.
It will give you a step by step with picks to follow

[zombola]

sorry for the delay and i thank each one of you for your help


https://media.giphy.com/media/awpqNsKuFtXI4/giphy.gif