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Hello, Inspect the vacuum temperature blend door actuator. Make sure it is hooked up properly and manually move the door, it should change from heat to ac, if it doesnt the door is broken. Vacuum test the actuator to see if it will hold vacuum and move. If it wont move or hold a vacuum, the actuator is bad, if its not getting a vacuum supply to move the door, you have a leak in the system from the front of the vehicle to the rear ac.
Do you need more help with this concern?
Hello, do you need more help with this concern?
Hello, yes the front leaking will affect the rear system. Yes you will need to remove the trim panel to get a look at whats working. There could be a leak in a supply hose, bad check valve of crack in the vacuum resouvoir tank. You can mount a remote vacuum tank instead of pulling out the front ac evaporator to replace the factory vacuum tank if needed.