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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.
Take a look under the dash at the heater/ac blend door(s) and cycle hot to cold on he dash heat control while asking for AC and the vehicle running.Do the doors move fully?
You may be able to manually help the door move to get cold air.
no....This is the rear A/C & heater actuator blend door malf/broken. This is very common on expeditions and I encountered the same issue in my 2006 expy. This door switches from hot to cold vents, once stuck only hot air will blow. Also, is there any thumping or tapping noises from the right rear panel (this is where the rear a/c unit is)???
always check the coolant first, then feel both heater hoses to see if they are equally hot.
if one hot and one cold, then the heater core is clogged
if both hot then you have a blend door problem.
on the a/c there's some time a rear unit that blow cool air even the front does not
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