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I have a problem that I need some help with. My a/c will blow ice cold while the truck is up tp speed on the highway. Once you hit town or stop and o traffic it blows hot air and it will never go cold again. But there is more. Drove it to Houston over the weekend and it blew ice cold down there. Would not work on the way home.. Hit traffic and a slow idle speed and it started blwoing cold. Just the oposite symptoms as before. I was told to change a switch out in the right side fender well on the high pressure side I think that kicks the fan off and on. Did that and same problems... Help please or refer me to a good diesel mechanic in the north DFW area......
 
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