A/C blowing hot air on driver's side

Does the vehicle have dual zone climate control, where the driver side and passenger side have different control? Sounds like a blend door issue on the driver side. Why did you replace the passenger side, was it blowing hot too when AC was on?

Dual climate control on these is not a manual valve adjuster. It is done electronicly with a electric motor on a valve instead of ran by a maual cable. Find this and check the plug for a 12 volt signal. If you are getting a signal replace the valve, if not it could be a blown fuse, cut wire, or a bad climate contol switch.

temp blend door problem. either actuator motor bad, door broke inside heater box, or somthing interfearing with it closing. it could be an electrical issue w controller as well.

If it has dual zone temp. control it is most likely the heater control panel.

Take battery cable off for 5 mins, then put battery cable back on. Insert your key into the ignition turn to on but don't start the vehicle wait 5 seconds turn back off repeat the key on/off three times. This initiates a re calibration of climate control equipment and actuators. It will fix your problem.

you may need to have the controller re-calibrated. There is a TSB at the GM dealerships on this. What is happening is the the blend door control for the pass side has OVER-travelled and is stuck in a default position. You can try to pull the Blue fuse under your hood for the HVAC, for about 5-10 minutes and put it back in. (with the engine off) Then restart the truck and turn the Climate control back on, and push and hold the Auto button for 4-5 seconds

I have the same problem with my 2003 Silverado. I am not sure how to fix the problem but I'll keep looking and let you know what I find out. If anyone has any suggestions, it would be greatly appreciated.

if it has dual zone climate setting it could be stuck in the cool setting. if it is not blowing any air it could be the duct came loose and it is blowing the air inside the dashboard. it will require you to pull the dash apart to inspect what the exact cause is. it could be anything from a bad temp setting switch in the climate control panel to a bad vac line that that switches the air from hot to cold. any other info you could give me may help such as if it is full electronic climate or manual knobs, dual zone, is it blowing any air or just no hot air.

It is probably the (DCCV) Dual climate control valve. It is located RT front of engine with heater hoses and wires goin to it. I ordered one from Rockauto.com for about a $100.00 i think. It is pretty easy to change and I found out when mine went out that it was a very common problem with these cars. When mine quit it started the same as you are describing for a while then it only would blow hot air and it blew the a/c compressor fuse. The DCCV is a dual cylinder valve and i beleive that they get stuck open and short out. If you have any more questions or need more information let me know.

Had the same problem with my Mazda6 awhile back. Took it to the dealer and they found the radiator wasn't holding pressure. They replaced the whole radiator under warranty (WHEW!). Not sure how to check for that kind of thing, but it's a start.