[5greenmonkies]

Busboy4, thanks for the reply. I was wondering about the rear evaporator as you mentioned. I first wanted to check the vacuum on the front control switch, which I just completed. Results are: at idle operating temp the black vac line holds at 20" hg, all the others are 0. While idling I jumped my black and orange lines to get the front dash blowing the ac. This worked so I checked the vac with the engine off. All lines (blue, orange, yellow, green, and red) held vacuum up to 25" hg. The black line could not hold vacuum with the engine off.

I also tried to track the vacuum lines to the rear unit. After removing all the rear panels and the back half of the roof liner I have determined the rear unit is electronically controlled (or the vacuum lines are well hidden). So I believe I am back to your thought about the rear evaporator.

At operating temp my heater lines under the left rear of the van are extremely hot to the touch (probably normal) and they are hot inside the rear cabin at the rear unit. In fact they are so hot that I noticed the rear left panel insulation has two burn marks from those hoses.

The ac lines under the van are not cold to the touch. The smaller diameter of the two leads to a bell-like apparatus inside the cabin at the top of the rear unit. This apparatus, while at operating temperature, is very cold and has condensation on it. The tube continues on and enters a plastic compartment above the rear blower. The larger of the two ac lines enters into the same plastic compartment but at a different location, also at the top. I did notice that where each of these metal lines enter that there were leaks where the black goopy stuff was not packed in around the lines. I went ahead and repacked the black stuff (no idea what its called) but this didn't help or hurt the air temp.

Not sure if the bell-like apparatus I metioned above is the evaporator or expansion valve. Also, I checked the drain tube for the same plastic compartment and it is clear. Any way I can check the evaporator and expansion valve? Thanks!