2000 Jeep Cherokee

Air Conditioning problem
2000 Jeep Cherokee 6 cyl Two Wheel Drive Automatic 97,000 miles

I have had my A/C repaired recently. They changed the evaporator, compressor, orfice tube, and accumulator. It blows cold when the A/C is on but when it is turned off the low side pressure shoots way up and the high side drops low. The original guy says it isnt anything he did. Any ideas on what would cause this so I can get it properly fixed?
March 2, 2008.

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