Question about 2005 Ford F 350 Super Duty

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When at idle a/c works fine but when going down the highway at higher speeds the a/c starts blowing hot. this is a 2005 6.0 ford 350

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This will be caused by either a bad compressor, which is probably not your problem on a newer truck, or a low refrigerant charge. At higher speeds the compressor is working harder and pushing the refrigerant faster through the system and if the charge is low, it will run out of refrigerant and stop cooling until its can get more gas. A clogged dryer/receiver or orifice tube can also cause this but, again, that will usually happen on an older vehicle.

Posted on May 27, 2010

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