I have a 2004 f-250.I noticed last year that it didn't seem to cool as well as it has in the past.This year it is getting worse.Around town it cools fine,but when you are on the hiway @2000+ rpm,its goes to pot.Being a long time AC residential & commercial mech.,I washed out the condensor,but didn't help.I guess I will buy some 134a & service fittings tomorrow.Am I assuming it is low on freon.Any other thoughts?Thanks,Ray
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