When I turn on the rear A/C it blows warm air. What can I check to see why the air is not making it to the rear area of the van.
Generally you would need to check the level of freon in the system, and probably the expansion valve in the rear unit. You should have one hot and one cold ac line going to each evaporator.
SOURCE: 1993 ford e-150 conversion van heat and a/c
Selection lever does not move to AC vent or floor vent only to the defrost. AC compressor does not kick in when AC is selected.
Vacuum level is at 18 instead of 23.
Any suggestions.
SOURCE: rear air a/c
Probably plugged or failed expansion valve on rear evaporator. Both front and rear are plumbed in parallel so if the front is cold, a problem with refrigerant flow at back unit almost has to be in the expansion valve.
SOURCE: heater blows cold air in my escort van
I take it the water level in the expansion tank is ok. You could have a blocked core in the heater. Also the heater could be leaking. You could try flushing the cooling system and checking for leaks and blockages.
SOURCE: 2003 ford van e350 rear air vent is not blowing
Try this article. I have the same problem and I think it is the vacuum motor that controls the door for changing from hot/cold in the rear heater box (located inside behind the L rear wheel)
https://www.fleet.ford.com/truckbbas/non-html/Q19.PDF
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