I have 2007 hummer h3 roughly 134k miles
when I turn the ac on the coldest settings it’s ice cold as soon as I lower it a notch it’s burning hot. So basically the max ac is ac and everything else is heat! It suppose to like adjust the ac to like less cold gradually until you pass the middle to the heat side then it start to get really hot . I tried calibrating my buttons by following a video online to calibrate the vents and such but the calibration doesn’t go the full way and it stop . Does that mean like my damper broke or multifunction? Or what could cause this and how can I fix it ?

thank you

 

May we assume you already had the HVAC recall fix performed?

From an old post by Hunner. That guy will be missed.
Since I see people asking about it I thought I would post how I did it to help those needing more info. It's great to have people with a common interest getting together to fix things.

The procedure here is the HUNNER method of installing it. Proceed at your own risk.

• I did not disconnect the battery as I wanted to confirm this resistor fixed it instead of by some fluke disconnecting the battery did.
• Set the parking brake. Turn the key on.
• It helps to shift to Low. However leaving the key on will drive you nuts so after removing the dash piece I put it back in park.
• Disconnecting the battery would of course shut the dinger bell off. So I would recommend that and you can leave it in low to have more room, now that we know this did fix it. (fingers crossed)
• First you have to do the stick your fingers in the DC sockets and pull up and out.
• I cut me a piece of cardboard for a work surface in case solder dropped.
• I disconnected the plug from the back of the switch to get more room to work
• Find the light blue wire with black stripe. I peeled back the high quality gooey sticky black electrical tape GM chose to use far enough to expose the wire back into the loom so I could slide on some shrink wrap long enough to cover the splice.
• Call me old school, I'm old and went to school, but just as in my battery thread I make a physical connection first then solder.
• I used some forceps for a heat sink.
• I used a Radio Shack 68 ohm 1/2 watt resistor. They come 5 to a pack for $1.30 or $.26 a piece.
• If you don't know, use a low wattage iron so as not to fry the insulation on each end. Heat the wire until it pulls some solder as you feed it.
• Use some fine solder, Radio Shack still has that!
• Grabbed a short piece of shrink wrap I keep around. After the solder area cools slide the shrink wrap you remembered to slide on BEFORE you soldered over the entire splice. Use a heat gun carefully to shrink the wrap and secure and insulate your splice. I did not re-tape it at this time as I wanted to test it first. I will use a high grade of black electrical tape or some loom.

Now in transitional fall weather you can adjust the air temp but leave on the air conditioning to freshen your cabin temp and humidity!
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problem with ac climate control need some help..

 

Search feature actually works if you try to use it.

 

I just saw the pics at the original post , thank you very much I’ll try that

 

update I did the resistor and everything working like it suppose to! Thank you very much doc don’t forget yall to do the calibration after to make sure everything is calibrated