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Hi Kinda New here, I have a 2008 GMC W4500 Forward Crew Cab 6.0 lts, gas (basically is an NPR HD), with overheating problems, Water Pump, Thermostart, Fan clutch and even the head job has been done since it was overheated, but as I got the truck back, it runs fine cruising at 60 MPH, but if you...