Air Conditioning problem
1999 Jeep Cherokee 6 cyl Four Wheel Drive Automatic 97000 miles
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Hi, I recently purchased a Jeep grand cherokee this winter, and come summer, I find out the AC doesn't work. I recently hooked it up to a pressure gauge, and it immediately rises into the red (over pressure area), then a click, (must be a safety switch), goes off, then the pressure drops, and rises again, repeating itself till I shut it off. Any advise would be greatly appreciated. Thank you in advance.

does the coolant fan come on when this happens? if no thenyou need to fiz that. the cooling fan needs to come on and cool the ac condenser to lower the high side pressure