2004 2500HD Chevy Silverado. 6.0L with digital dual climate controls. Everything was working fine before I changed the battery.After, the AC blows cold for 15 secs or so, then it switches to full hot.
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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?
Check the actuator motor on the heater it directs the air into the vents. There is probably two of them be sure to check both. The motor makes the vents move and again directs the air where you want. Hope this helps.
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.
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.
Just had this happen today to my 2007 silverado heat on the right side cold air on the left side. After engine was off 15 minutes and restarted heat was on both sides. I'm guessing a relay failed to open door to allow the heat to flow thus blowing cold air.will monitor diligently for a while.
My 02 Century has dual temp controls . One for driver for passenger. Make sure you don't have the dual climate enabled and just set for heat on your side and AC on the passengers
this is caused most often by out of phase climate zone blend door actuators, it is a very hard problem to repair, some luck in fixing it comes from removing the negative battery cable for 5 minutes to try and re-phase/sync the door actuators,if the one door will not change temp then it is more than a door sync issue and can require replacement of the blend door actuator, are the outputs of the 2 sides just reversed? that is to say will they change from hot to ac even though one is hot and one cold and visa versa?
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