Newer cars have dual heat and cold on each side separately and hot on one side cold on other vent actuator not working how to fix you will need to remove part of the dash best take to shop cuz Dash work is not easy and the plastic Clips holding everything in usually break when removing depending on the exact problem location 50 bucks 2 600 bucks depending on what shop you go to
SOURCE: heat works on driver side, passenger side blows cold air.
Did you check your coolant level or was it low and you added to it at some point? If so the system my need to be bleed or worst case the thermostat is going bad.
SOURCE: heat works on driver side, passenger side blows cold air.
Blend door for passenger side or blend door motor has failed. Very big job to remove dash and work on it. Except the door motor is accessable from the glove box.
Rudy
SOURCE: how can I fix
This is either an out of phase issue or a temperature control blend door or blend door motor actuator problem, it can also be the climate control module in the dash, 1st try disconnecting the battery for 5 min's to re-sync the climate control module, if this fails u will need to find out what blend door is the problem or if they are ok replace the automatic climate control module in the dash
SOURCE: 2004 gmc 1500 heat is only blowing on passenger
sounds like you have dual zone climate control in your truck. Most likely the actuator that controls the temp door in the HVAC box
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