Question about 2003 Chevrolet Tahoe

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A/C and Heater Only works on the highest speed

2003 Chevrolet Tahoe 2/w Drive. Both a/c and heater works good, the only thing is that it must stay on high speed # 5. If I drop the the fan speed to any thing lower, the system shuts off.  Its started by loosing fan speed # 1 then #2 and so on the only one that has continued to work is #5. Please help, is it the in dash heater a/c switch that needs replacement or a simple fuse that has expired.

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  • Anonymous Jan 03, 2009

    Heat only work on High also , But in the morning truck feels funny like its going to cut off ideals high the low but doesnt cut off also ...

  • Anonymous Mar 28, 2014

    It used to work on speeds 3 & 4 but now it's completely stopped working.

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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.

Posted on Dec 15, 2008

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Not the fuse, if that was blown, the system would not work at all. Probably your switch assembly has gone bad.

Posted on Nov 25, 2008

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1 Answer

The 2 low speeds are not working on my pickup i was told it could be a low voltage relay and needing to know where it is located at!! it goes on a 2003 silverado extended cab 1500 5.3litter 4x4


Are you talking about your Heater/AC fan??

If so there is a resistor pack under the dash on the passenger side (mounted to the heater housing). I would check it first.

My 2003 5.3l did the same thing; (not saying that it couldn't be something else). We froze that Summer because the AC only would blow on high.

My silverado had about 80,000 miles when I replaced it, now I have 96,000 and it still works fine.

There is an updated design available that should get your speeds back to normal, and last longer than the original part.

Good luck!




Good Luck!!

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I have a 2003 Chevy Tahoe . The heater and a/c fan only works on the highest speed #5. How do you repair this problem?


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you have air trapped in the cooling system. A good indication is that one or both of your heater hoses going into the heater core are cold when they should be hot.
Park facing uphill, raise front of vehicle so radiator cap is higher than top of engine. (You want bubble to get to radiator and out the cap.)
Leave cap on but loose, so bubble can purge.
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please Rate as fixya if this works. good luck

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