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need a.c. help and loss of power

Hi my 91 740 with the regina system is running weak and seems to have loss its power in the last year. I have 170000 miles on it and my air conditioning only will blow nice and cold when i hit 65 miles an hour. I replaced the idle air control valve and my refrigent on the ac is full and my ac was blowing very cold at any speed for a few days after the iac valve replacement and now it only works when i get up to highway speeds again but once i am at highway speeds it is ice cold the hole time. If someone could help me solve my loss of power issue and my ac issue i would appreciate it. thanks






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