So this morning got up went to work and had heat. 12 hours later I get back in my 2007 hummer h3 base with 53000 miles and I get no air out of my vent. Heat air every setting and nothing happens. Any ideas? Thanks!

 

Look in the duct behind/under the glove compartment. You should see a wiring harness and plug screwed into the duct. Remove it and check wiring on the connector plug, it is most likely melted and needs to be "fixed". Replacing it will just let it happen again, doing an easy wiring "fix" is much better. (Search for it on here, its common)

 

Thanks rsc. Well looked at the connection and it's not burnt up or anything. Everything looks good. Any other ideas?

 

If the a/c fan resistor harness is not melted (after you removed the part from the duct) then I would look at the **** on the center dash (of course, it is never a bad fuse is it? ) After that, you maybe had all 4 blend actuators fail at the same time???

 

I haven't looked at fuse yet. Do you know what number I should look at? Also when I turn center **** to 4 I can hear a single click noise under the dash around where the resister is. Also the light in the center **** comes on so I'm not sure it that would help to try and diagnose this problem. O yea another thing I got in this morning to leave and thought for the heck of it I turned the **** on and it started to work for about 1 second then nothing after that. Again thank you for helping me try to figure it out.

 

Someone smarter than me may come along, but I think you may be looking at a $250 dollar panel. Maybe you can check voltages with a DMM coming in to the fan **** and back out?? If I had a wiring schematic, I would try to jumper a wire for 12V straight through and bypass the panel to verify the motor is still good, or apply 12V directly to the motor.

 

the motor gets 12v direct from a fuse. all speed resistors go to ground as does the high relay that he said clicks at top settting. no fan? check the fuses.

 

What fuse should I be checking?

 

fuses are under the fuse cover under the hood. pulling the cover is needed to get fuse locations.
you'll need to open it up if you plan to do your own fixes so look up the fuse info there. when you do.

 

Yea I didn't know what number or specific one I should pull.