A/C is hot on the drivers side cold on passenger side??
I am running the system in the auto setting with the temperature set at 60 degrees and the air on the drivers side of the car is HOT...like the heat is on. However, the air on the passenger side of the car is ICE cold. I do not have the passenger climate control turned on, so both should be the same. I'm sorry I don't have any more details than that, it is my father-in-law's car and I am not experienced with newer Cadillacs...if only he would have bought the '70... Anyway, any help would be much appreciated and I hope to hear from someone soon.
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Hello: You have a failed temperature control actuator for the passenger air mix door. Remove the glove box and the close out panel under the dash on the passenger side. You will see two silver rods going from the actuators (mounted on the top and bottom of the heater/a/c programmer) Turn key on (engine off) Turn the a/c heater control on. Go from 60 to 90 or 90 to 60 and watch the rods the one that doesn't move is the failed one. The actuator is held in place by two 7mm screws and one electrical connector. When installing the new actuator have the temp set at 60 when you hook up the linkage. The passenger side set at full cold.
The way G.M. designed this system is if the a/c system is low on r134a, the passenger side is disabled to allow driver comfort. When the system gets too low it will shut down a/c all together. Another problem could be faulty interior temp sensor on right side of dash, or stuck blend door/servo motor in a/c box under dash. Programmers are also known to fail.
this problem is caused in almost all cases by a failed actuator that moves the door insiode the heating/ac duct to change the outlet temperature, it is called the Air Temperature Control Blend Door actuator.
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
The problem is most likely a bad dual climate control valve. This component is located on the right side near the radiator under the hood. It will have several coolant hoses hooked to it and 2 silver cylinders protruding from it. You can clamp off the heater hoses at the heater core and see if both sides cool then and this will tell you that the valve is letting coolant thru when it shouldn't be.
This will narrow it down to either the valve or the control head inside the car,or wiring in between them. The only way to narrow it down further is if you have a scan tool that could access the climate control data. Have seen several of these valves cause this concern and have only seen one control head cause it.
Turn your AC off.
Turn the car off
Crank the car
turn ac on drivers side to 60
passenger side to 90
wait 1 minute
turn AC off (very important)
turn car off
turn car back on
switch driver's side 90 passenger 60
wait one minute
turn AC off( very important)
turn car off
turn car on
AC 70 both sides
your ac should be blowing cold
If not, you have an expensive problem