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Car AC cools only above 40mpg!?!?

jeepnellyjeepnelly Posts: 1
edited June 2015 in Jeep
My Liberty has been having ac issues. When the car first turns on in the morning (car engine not hot) it cools then as the car heats up AC only cools when above 40 mph.

Some recent history:
Just replaced radiator fan relay as the radiator fan would not start up. It does now but I wonder if the fan has two speeds? If so would there be another relay to look for and change.

I checked the compressor and it starts up but then turns off.. I assume it is a safety mechanism but not sure. Any ideas as to what it could be?

I am going insane as I'm in south Florida, traffic and I feel bloody hot:(
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