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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.
The rear air has an expansion valve in the rear of the cargo area right next to the rear evaporator. There is no orifice or filter between the condenser and the rear expansion valve so if there is any debris in the line it will clog the expansion valve. The orifice under the hood is only in the front circuit so if the front is cooling and the rear is not, most likely the expansion valve is clogged and needs to be replaced.
There is a factory service bulletin on how to r&r the expansion valve. It requires some cutting since they did not design it to be replaced. Part of the service bulletin is adding an inline filter at the outlet of the condenser before the front and rear flows divide. That will keep the rear from clogging up again.
I have a 94 Suburban and I had to do this in about 1998. With the filter I haven't had any problems since.
well my 94 just blew a belt and they all seem to run on the same main pully. As i just learned these belts need replacing, especially the timing belt. its only good for 70000 miles. If its beyond that and the timing belt gets strecthed even a 1/4 inch it can throw off the timing and much more and make your car turn pretty gutless. If the timing belt brakes, there is a good chance it can permanetly damage the engine valves. If the timing belt is weak, it may affect idle when the ac needs to be turned as well?