Question about 2008 Hummer H3
Check the fuse panel, for a blown fuse. If that's not it, find the wire that powers the blower motor, it is usually visible in the engine compartment firewall area. Test to see if power is getting to the motor, if it is replace the blower motor. Usually not a hard job.
Posted on Jun 30, 2009
After checking the obvious things such as fuses and connections with a test light or volt meter , check the power at the blower motor ( behind glove box door . low and to the right ) If power is not present check the blower resistor and wiring harness ( resistor will be attached to the blower housing . These can become very hot and even melt the harness .
Posted on Jul 10, 2009
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Posted on Jan 02, 2017
this problem is caused by a defective air temperature control blend door actuator motor, it is about center of dadsh in air ducting, it moves the door that diverts air for cold from ac or hot from heater, you must remove the dash to repace it, about a 15 hour job fotr a home mechanic with a factory repair manual, nearly imposs without one.
Posted on Sep 04, 2009
Your problem is a faulty heater control valve. The design used on these vehicles allows for hot water to flow constantly and compete with the evaporator as there is no blender door. You have to replace the valve and possibly the control head. Meanwhile, you can bypass the valve to have cold air
Posted on Sep 12, 2009
Ok, if you are trying to use your AC and its not turning on, odds are your refrigerant levels are low, the system will not turn on when low fluid levels are present so the system doesnt burn up the compressor.
If your blower motor is not operating, you may have a fuse blown that needs to be replaced, or the control chip that plugs into the blower motor (for fan speed settings) has burned up (easy fix).
If your climate control is not throwing out heat when you change the settings to hot, you have a leaky vaccume line and the vaccume pressure is not strong enough to open or close (depending on setting) your blender box. Although typically when a vaccume line springs a leak you will have issues with your selector switch as well (defrost, vent, floor)
Also pay attention to your temp gauge to make sure the thermostat is operating properly, and the engine is not over heating ro getting excessivly hot! If it is, then you need to replace the thermostat ($8 part)
and go from there. Also you should check your heater core, if it gets clogged or has restricted coolant flow, your system wont have the heat it normally did (if any) when it worked properly.
This is just a quick summery of the area's you should be looking into for the problems you are having! thanks for using Fixya.com and good luck, I hope I have helped make resolving your problem alittle easier
Posted on Jan 08, 2010
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