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Q:

My AC is cold but after it is run for about 10 minutes the compressor shuts off. on 2000 Mercury Mountaineer

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When it cools off it comes on until it warms up again.
(1) Answer
(1) Comments
Time for a compressor, accumulator, orifice tube and flush the condenser. You have a restricted o-tube.
Or a faulty evaporator thermister or a faulty pressure swich or a stuck clutch relay causing it to stay on till pressure gets to high and cuts it off as a fail-safe.or get it diagnosed at a shop you trust (I hope you did the last item first!).