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2013 Jeep Wrangler - AC issues

ac works off and on high pressure side is 250 to 300 psi with a standard 18 oz measured charge has good air flow what else is the problem?

Since the vehicle doesn’t utilize a CCOT AC system, the high/low side pressures should be constant.

The only thing that can cause a fluctuation in the high side pressure is a faulty expansion valve.

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