Question about 2005 Chevrolet Silverado 2500HD 2WD

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The heater blower doesn't change speed. It's a constant low speed. Every now and then it will go to high, but not very often. It also stays running for about five minutes after you shut the truck off and get out. It's a 2005 gmc with climate control for both sides.

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Sounds like a bower motor resistor to me.

Posted on Mar 07, 2009

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3 speed fan barely changes speed


You are talking about your blower fan for the air conditioner and heater right? More information will be needed to solve the problem.

When you say it barely changes speeds, does that mean it doesnt speed up, or doesnt slow down? By that I mean, is it "stuck" on low, or high?

Most blower fans run at different speeds through the use of a multi-stage resistor built into the fan switch circuit. Low speed is a high value resistor, medium speed is a low value one, and high speed is the fan running without any resistance.

If your fan is running on high and doesnt seem to want to run on lower speeds, the resistor pack may be failing. If the fan is running on low speed only, it may be that the fan itself is beginning to fail, or that the lubricant in it has gotten gummy.

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1994 chevy kodiak with Cat 3116. Heater/AC blower shuts down


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High speed doesn,t work on heater switch.


Pull the heater control panel out of the dash and inspect the blower speed control switch, look for signs of a burnt connector to the switch, it will be discolored looking, if this is the case replace the switch and install a repair connector

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1 Answer

2002 Grand Prix heater/lights, My heater randomly works and if the heater doesn't work either does my head lights. I'm thinking it's my ignition switch?


If you mean that the Daytime Running Lamps (DRL) does not work when the blower motor does not work, then YES it COULD be an ignition switch problem. However, not very likely (please read on). The regular HIGH and LOW beam headlamps do not require the ignition switch to operate.

The main circuit that runs your regular headlamps also runs the blower motor HIGH speed. This has nothing to do with the ignition switch.
This circuit also operates the Power Mirror circuits and the Hazzard Flashers. You may want to check to see if these are also malfunctioning when this happens.

The Circuits for your other blower speeds go through the ignition switch along with the DRL control module, but your HIGH speed does not. So if it is your ignition switch, your HIGH speed should still work and your regular headlamps should still work. You will lose only your lower blower speeds and DRL if it is an ignition switch problem. You will have a bunch of other stuff going out if it is an ignition switch also. The ignition switch circuit that runs your DRL module also runs your Powertrain Control Module. So if it is an ignition switch problem causing your DRL to shut down, your engine will also be shutting down.

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My heater fan runs on low and high only


You need to change the blower motor resistor.

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if you have just high speed, you need to change resister, usually in plenum case to keep it cool. If it goes again, change motor, it is drawing too much current

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When this happends, it usely is caused by a bad blower motor resister. I can't tell you if it is a seperate unit or if its built into the blower motor . If its a seperate unit it should be located close to the blower on the heater box, if its in the motor you will have to replace the motor.

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Heater blower only blows on low


This could be a few different things:

1.Check the power and ground connections on your blower motor, corrosion can cause high resistance and a slow blower speed.

2. Check your available voltage at the blower motor on the different settings. it should vary with high supplying 12volts, make sure to do this check with the blower motor still plugged in.

3. Connect the blower to a 12v power source and see if it runs at high speed.

If all else fails i would check your resistor pack, i would not suspect this because when it fails you usually just loose all speeds except for high, but it could happen.

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