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Q: Having trouble with AC, sometimes it blows cold air,then warm air. on 1999 Ford Explorer

when AC is turned on will blow cold air, sometimes when you accellerate it stops blowing cold air. It also blows cold air out when you have the heat on.
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Your 134A (ac juice) is low. you must have a small leak in the system. Ac has a shut off safety switch on the low side of the system. When your system goes too low (pressure) it shuts off the AC pump to protect itself, since the 134A also carries the oil to lube the pump. When the system is low at normal rpm the pump works and cools but at higher rpm the pump draws the pressure below the safe mark and the pressure switch cuts off power to the AC compressor pump. No pump, no cold. Fix the small leak, top her off and you will be fine.
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