I had my AC serviced a couple years ago due to a bad hose and it's been fine ever since and it gets really cold while driving it in town and short trips down the highway. But even before the AC repair and after during the 5 years I've owned it the AC always gets warmer while cruising on the interstate for an hour or longer. Any ideas what would cause an AC to do this that is properly filled and not in need of service? Also..I when it starts blowing not as cool the air coming from the vents feels like it's not as direct or coming out of the vents as fast.
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