Question about 2008 Hummer H3

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AC/Heat stopped blowing air. How much to fix?

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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

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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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6ya6ya
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Posted on Jan 02, 2017

co7196
  • 3433 Answers

SOURCE: AC blow cold air when moving but warm air when stopped

AC system appears low on charge

Posted on Jun 19, 2009

AUTODOC01
  • 216 Answers

SOURCE: my ac and heat stopped working, stopped blowing

check blower motor and resistor with test light,

Posted on Aug 25, 2009

emissionwiz
  • 75822 Answers

SOURCE: heat blows out driver vent when ac on

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

  • 15 Answers

SOURCE: ford ka heater blows hot air all the time

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

herbalgarden
  • 344 Answers

SOURCE: '00 Jeep Wrangler with no heat and AC not blowing

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

Testimonial: "herbalgarden answered my question fully. No one-word answers here; he answered each aspect of the problem and offered multiple troubleshooting points"

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It sounds like your AC unit could be overheating or even damaged.

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When the car is moving, more air is forced over the unit, likely keeping it cool enough to run, however, when the car come to a stop, it loses that air flow, and quickly heats up. Thus, the AC would work while the vehicle is in motion, and overheat and stop when the car is stopped and idling.

However, the AC unit could be completely blown. The cold air while moving could be just a case of air being forced into the car. Think of a house fan, the fast the wind blows on you, the cooler it gets.... Thus, it could be an illusion that the AC is working when car is in motion, when it really isn't.

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My ac was working fine then one day it stopped and now only hot air blows out the mechanic said the ac is fine and works good but there is a vent door that switches the ac to heater and he said it was...


There is a blender that controls the air flow to go through the heater core for heat, and the evaporator for AC. It very well could be stuck.

You maybe able to try and get it to get unstuck by running the cars AC and switching from heat to AC back and forth and see if it gets unstuck. Just turn it on full blast and go from heat to cool.

If that fails, then you may need to service it. There should be a Lever Marked VENT under the dash, usually by the Brake and other pedals on the Driver's Side. Close the VENT and that will stop the Air from coming in and leave the A/C Blowing through the outlets(Vents).

I also read this online if you have an electronic climate control. "On climate control press off and heat button and let go quickly. Then press automatic. The display will start rotating eventually displaying a code 025,125 , 024 etc. Then press defrost to stop. You may hear blend door operating atb that time. It worked for my climate control."

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