Question about 2008 Hummer H3

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I HAVE AN 06 H3 HUMMER the heater was blowing fine when I shut the car off ok, when I got back in and started it the heaters blower stopped. I have checked all fuses and relays and they are fine I even swapped fuses and relays around and everything is working except the heater fan whats up? Marty

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  • vampirate Jan 26, 2009

    Anyone? I have a 2006 h3 also and the heater seems to stop when it gets so cold. Convenient as always. Checked fuses already. I was about to investigage under the glove box according to on-line troubleshooting. Can anyone shed some light on this job before I go in and pull things I shouldn't?



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Check the blower speed control, it most likely burned out, also jump battery power direct to the blower and see if it runs, if it does the speed control is defective, if it doesn't the blower motor is toast.

Posted on Jan 16, 2009

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My '08 H3 blower was not blowing air on any setting after I started the engine, unfortunately on our coldest day of the year. We also had 1 1/2" of snow and the defroster wouldn't work without the blower. Stranded! I checked the blower speed resistor pack located under the glove box on the far right side. Tight fit but easy to reach from under the dash. Take out two phillip head screws to remove the white plug. The white and red wiring plugs did not show any melting around the wires from heat that I had read could cause the problem. However, the flat resistor terminals were showing corrosion and the resistor pack appeared to be somewhat discolored. So rather than freezing while troubleshooting further with my meter I went ahead and bought a new resistor pack. Plugs right in, a very easy and quick operation. GM# 15-80647 at about $27. Fits several years of H3's. Blower now works perfectly.
Probably would need a blower wiring harness if the red plug is melted. Harness should be easy to replace if you drop the glove box door.
Discovered that these resistor pack problems are extremely common on H3's and other GM vehicles.

Posted on Jan 31, 2014

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It was a temp fix for me I replaced the resistor pack and harness it lasted about 2 weeks and burnt the new harness and resistor pack. Worked fine until now no changes to vehicle just died. repalced it and it died again.

Posted on Sep 02, 2009

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