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Re: 2004 silverado ac heater problem
I had this same issue 2004 2500HD duel climate zone.Some times when I hit a bump would go to hot.Turn off truck and restart it was fine.Dealer checked plug in and said wire were loose,then door actuaters was bad.I ended up replacing the heater control myself and it worked fine ever since.
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You may find a reset will solve this annoying problem. The problem you have is the GM heater control unit has lost it's
calibration, which can happen from time to time. The way to reset it is,
start your car and turn your heater off, and shut off the car, pull out
the keys. Then with vehicle off, disconnect the battery, (or batteries
if it has two). Let sit for 10 minutes, then re-connect battery. Get in and
start the engine, DON'T touch anything, let the heater control unit
re-calibrate for at least 40 seconds, (by the clock), then try turning
on the heater. Good luck!
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
Well had the same issue on my duel climate controll 04 2500HD but changing the heater control solved the different temp.The only other thing would be your mixer door motor.There are two,one for DR side is probibly stuck..As far as the blower motor.The resister should have taken care of that.Sounds like you may have another bad one.May want to take a volt meter to the resister plug in and run you different fan speed just to make sure that you get voltage to the different conecters.
Cold on drivers side and heat on passengers side, actuators working properly and blend doors are moving. Heatertreater is for piece of plastic on actuator motor. I moved blend door by hand after disconnecting actuator and works fine, both sides freezing when moved in opposite direction.
The Drivers temp actuator has stuck. Most of the time they need to be replaced. That is the one on the bottom of the dash. It's underneath by the tranmission hump. Most trucks have a cover. You will need to remove it to gain acess. There are 3 or 4 7mm screws that hold the cover on. Then the temp actuator is right there.
You may be able to unhook the battery and see if it resets before you go through all of that. Sometimes it works most of the time it does not.
You have dual zones that are controlled by temperature actuators the passenger side has lost its memory or has gone bad you can put it in self programming by disconnecting the battery for ten minutes then hook it back up start the truck turn the temperature control on but do not touch any other controls let it go thru the self programming for about 6 to 7 minutes then select your temperature you want if it still does not work properly you may have a bad actuator or a bad connection at the actuator