Question about 2003 Chevrolet Avalanche

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2003 Chevy Avalanche fan blower only works on high

The other speeds 1 through 4 just quick working. A/C heater blower now only works on high mode

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Needs blower control module

Posted on Sep 08, 2009

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Posted on Jan 02, 2017

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My chevy avalanche aircon blower will not start on 1st to 4th only works on 5th speed. Chevy Avalanche 2003 model with 5.3 L


Sounds like a blower motor resistor. Not an expensive part, fairly easy for a mechanic to change. Located usually behind the glove box door.

Jul 15, 2011 | 2003 Chevrolet Avalanche

1 Answer

Heater/acblower fan doesn't work on high. Other fan speeds work ok. what is the problem? It's a 2003 chevy astro van


Hi, check fuse 12 first. If it is good, you will need to replace the blower resistor. The high speed relay is built into the resistor. The resistor is next to the blower motor and looks like the picture below. There is a connector in the resistor and the 2-wire connector coming out of the resistor attaches to the blower. The blower is usually under the dash above the passenger's feet. You may have to remove a kick panel to see the motor and resistor. Please let us know if you have any questions, and thanks for using FixYa.

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Feb 19, 2011 | 2000 Chevrolet Astro

1 Answer

2005 Chevy Avalanche - my heater contol turns the fan off when I put it on #5......works fine on 1, 2, 3, and 4, but as soon as I turn it to 5 ....it stops.....


Motor switch has gone out, most likely due to high load on level 5. Replace switch and I suggest lubricating blower motor bearing to help take the strain on the system.

Apr 16, 2010 | 2005 Chevrolet Avalanche

1 Answer

2004 chevy heater fan works on low and medium speed but not on high speed


There are two relays for the heater control fan,a low blower relay and a high blower relay.It sounds like the hi blower relay is bad.

Dec 12, 2009 | 2001 GMC Jimmy

2 Answers

Heater blower is not working in 1, 2, 3 and fan


MY 2003 MALIBU AC WORK VERY COOL FOR ABOUT ONE HOUR AND THEN TURN A BIT HOT AND THEN NO AIR COME OUT WHY I HAVE CHECK THE FREON AND ITS OK .

Nov 22, 2009 | 2003 Chevrolet Malibu

1 Answer

Blower doesn't work at high speed


you will need to replace the fans blower resistor. its mounted in the cab. in the lower right side of the heater box. some aftermarket suppliers are carrying the part but all chevy or gmc dealers will have it.
good luck chris

Mar 15, 2009 | 2003 GMC Envoy Xl

1 Answer

Heater fan only works on high on my 2002 Avalanche


If your Chevy is equipped like most vehicles, the speed control is accomplished by a stepped or tapped resistor that has now failed. This may be located on the fire wall under the hood or near the blower assembly under the dash. When these resistors go 'open' inside, it will only affect the lower speeds since the fastest speed bypasses the resistor completely. Can't say how hard yours is to access but the part is pretty itself is cheap, guess that's why they fail so often.

Feb 19, 2009 | 2002 Chevrolet Avalanche

2 Answers

A/C and Heater Only works on the highest speed


The blower motor resister is bad...It is very common in chevy trucks. The resister is located behind the glove box and is held in place by two screws, it will also have a wire harness attached to it. If you want to see a picture of it go to www.partsamerica.com and search for the blower motor resister.

Nov 25, 2008 | 2003 Chevrolet Tahoe

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