Question about 2008 Hummer H3
I just solved this problem on my 06 H3. My fan just stopped working on all settings. My problem was the resistor pack. It internally shorted and burned the harness. Once you locate the parts it is only like a 30 min fix. Under the glove box is the blower motor. There is one red plug, that is for the resistor pack. Under that are two screws holding the resistor pack in. Check to see if the red plug is burned, if it is, replace it. Then replace the resistor. The harness to replace also has two other connectors at the blower motor(one for a relay that is beneath the blower motor and one that actually powers the fan). The harness (for an 06 H3) is part 25867517 List Price $28.68 and the resistor is part 10397098 List Price $37.72. Hope this helps..
P.S. The motor is a regulated ground don't apply power to this wire. The Brown wire is 12V+ and the Orange wire is regulated ground. Here is the diagram.
Posted on Jun 30, 2009
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
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
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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