Where is the charge port on a 2001 ford expidition front and rear a.c. unit with a 4.6 ltr auto. trans.
the rear a/c unit uses the same a/c charge ports that the front unit uses, check freon pressures, low side should be between 35-45 psi. high side pressure should be from 225-250 psi. if pressures are within range then the most likely cause would be one of two most common problems and they are 1. rear orifice tube is restricted with debris. 2. rear temperature control (mode door) motor or actuator is inoperative.
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