My 2005 caravan started blowing hot air out of the vent above the right side, passenger side, sliding door. But it was blowing cold air on the left side vent above the sliding door. Temperature setting on the roof was on cold and outside temperature was 69 degrees. When I turned the rear temperature up the left side vent, above the sliding door, got hotter and the right side, above the sliding door, got slightly hotter. I thought all the roof vents were hooked up to one tube from the heater/ac unit in the back. This doesn't make sense, help!

 

They are all connected to the same outlet duct. Both sides have the same quality of air flow. A lot of joints up in the roof.

 

Exactly what I was thinking so what could have cause this? Could the air cool down that much from the right side to the left? It didn't do this before, very odd.

 

most likely is a duct has come separated and is getting fresh air mixed in. The duct comes up the right rear corner and then around the roof. Probably also a rear blend door issue if it is set to cold and blowing hot air. Try running the system calibration and see if it improves anything. Hold down the power and recirc buttons at the same time until all the other buttons light up.

 

Do you know if this works on 5th gen GCs?

 

It does not work for the RT body (08-13). Those have to be calibrated with a scan tool.