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Sounds as if you have more than one problem. If the rear is blowing hot then the AC is not working. The front should also blow hot if the front fan motor is functioning.Youi need to have the system pressures tested for proper freon levels and have the front blower motor system tested if it is not working
I have a 2000 GMC Savana Van SLT with front and rear AC/Heat. My front would blow hot while the rear blew cold with AC on. It turned out to be low on Freon. It's hard to know if you have the right amount of freon installed because pressures vary depending on the ambient temperatures. So the best way is to remove all the freon then reinstall the recommended amount as listed on the evaporator housing near the firewall. This worked fine for me... works like new after installing the correct amount of freon.
Getting your system recharged at a dealership would be recommended but only hot air coming through the front could be an hvac problem, make sure that all your vacuum lines that run to your system are not crushed or unplugged, they will be located in the engine bay of your vehicle.
Either the door that controls whether air from the heater or ac is stuck in between or the ac system is having trouble. Minivans sometimes have seperate compressors for the rear and front.
On the bottom of the air unit is the lever that changes temps. It likes to fall out of place.I propped mine back with a piece of half-inch copper pipe a couple of years ago.Remove glove box then panel on front side of console to access.
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