One side blows cold air and the other side warm air. I assume the Control Blend Door is stuck. Everything was working great until I replaced the battery. I have disconnected the battery and after waiting for 30 or so minutes, reconnected the battery with no change. I also tried taking our the HVAC fuse B and waiting then reinstalling with no change.
Surely, replacing the battery didn't not ruin this door. The dealer is asking $700 bucks to repair. I think the DTC need to be reset.
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Re: 2004 Bravada Climate Control Blend Door
You might try treating it like a computer...reboot. Disconnect the battery for 20 minutes and make sure the cell phone charger doesn't have a cell phone in it. Surprisingly enough, there was a guy years ago on the old Wrenchead.com site who couldn't reset the codes on an OBDI vehicle and later found a cell phone on the charger which was back feeding the ECM enough the codes wouldn't reset.
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Sound like you have a blend door actuator that had stopped working. You have cold AC on the drivers side but not the passenger side? Your car has dual zone climate control where you can adjust either side independently. If you have cold air when you ask for it and hot air when you ask for it then the overall system is working properly, it is just that one side is not moving the blend door between the heater core and the evaporator core. Either you have something inside of the hater box that is keeping the door from moving or that hte motor that is suppose to move the door has quit.
An all too common problem is the heat/air blend door in the climate control duct system. The blend door is either stuck, or you could have a bad actuator, ( the actuator is the device that moves the blend door based on your setting.)
This is my best guess with out knowing the year of the vehicle.
If you have a climate control system, ( driver's side, and passenger side heat & a/c setting ), you likely have an issue with the blend door being stuck, or a bad actuater, ( this moves the blend door )
If you do not have a climate control system, you likely have a trap/flapper door sticking, or some blockage in the duct work.
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.
I have narrowed the problem to a non-functioning climate control acctuator (a mechanical vent door opening/closing unit that mixes warm and cold air) Unfortunately it is located high in the dash and requires entire removal of dash panel. Shop repair manual states a repair time of 5.2 hours... GM parts $260 actuator $75 door panel......Online parts $60 to $175