I have same problem in my 2006. The light goes out on the drivers side and It actually blows hotter then when I had the heat on high. It will only blow hot even when AC is on. I assume its a loose connection because if I hit top of dash hard or bottom by ashtray the light comes back on and all is well until it goes out again. I am a procrastinator and keep putting off going to the dealer but I am going to soon.

 

Pulled the unit apart today, found that the large gear in the actuator assy was cracked. Found a new unit on Amazon at half the auto parts store price.

 

Great find... Amazon is a great source for parts
take picture of the broken parts and post if you can...

 

What did it cost? I assume you took out the blend door actuating motor? How long did it take. Any input would be helpful. I simpy unplug the actuator motor.

 

The one from Amazon is $69.95, Advance Auto was $138.00; Took about an hour to get the old removed, new actuator should be here tomorrow and I'm hoping to be able to say "job done!"

 

Take and post a few pictures of your process as a how to if you can

 

Installed the new actuator, ran through the cal procedure, and "whoopee", heat works fine again. I want to thank everyone for their help. Attached (hopefully) is a picture of the old actuator with the cracked gear

 

I have a similar problem, my ac/heat will only go to 3, if I put it on 4 or 5 the whole ac/heat thing shuts off. also when I have it on 0 "off" it blows, but only when im moving. the faster I go the more it blows....

 

05 Silverado LT dual climate control.
Replaced the Blend Motor and the Dash Control Unit and have disconnected the battery and done the recalibrate, pulled the fuzes and did the recalibrate. (key in ACC for several minutes)

Still no joy, no auto function, air flow is either "ice cold" or "total hot." I is produced only when the temp is set to 90 (the max).


HELP!

Thank you
David

 

Hello
I just recently bought this truck used, and kind of thought that the heating/cooling system was not acting correctly. The cabin temperature would vary greatly while driving and/or the temperature controls did not seem to respond to changes I made ,so I was constantly adjusting the temperatures to get what I wanted.I investigated today with the truck safely parked and noticed that there was no change in the temperature of the air coming from the 2 left vents in the dash as I slid the left temp slider up and down, but the air temp coming from the 2 right vents changed as I slid the right slider up and down. I then searched on the internet and came across this post (the 09-28-2010 post by the dogg7 in particular). As he mentioned, with the truck off, the heater fan off, and the key in the accessory position, I was only able to hear the passenger temperature blend motor working as I slide each of the temp sliders up and down.I then removed the heater fuse in the fuse box under the hood and the 2 heater fuses in the fuse box at the left side of the dash for 10 minutes as suggested in some other posts, and everything is working correctly again. Will the problem return ?.Is the temp blend motor on the way out. I have never disconnected the battery which some suggest can trigger this problem. From what I read ,the drivers temp blend door motor is on the passenger side and fairly easy to get at and change or fix. How hard is it to get at the passenger side temp blend door motor,if it should fail too? Does a lot of the dash have to be torn apart to get at it, as some web sites mention? Would it be a good idea to change the heater core while everything is torn apart since the truck is 8 years old?
Thanks Nov 2014