Is the compressor working and pressurizing the freon --- is there air in the system along with the freon preventing the system from circulating --- is the heater control or vent closing --- are the evaporator coils/fins clogged or dirty -- are the air conditioning selector controls properly actuating vents for mixing inside and outside air and closing off heatter vents --- need more investigation on your part
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what is the low side pressure reading? is the compressor cycling?
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