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coolant system issue
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  1. Duramax Fourth Generation: 2007.5-2010 (LMM)
    Okay so I started my truck the other moring let it run for 15 mins it warm up to 89 degrees I went to store witch it 2 mins down the road then back to my house and then about 15 mins away and it didnt warm up so I stopped and check everything I t uh need around and head back home and the temp...
  2. 6.2L Diesel Engine
    Well, I am not sure what to try from here. I just replaced my thermostat for the second time with another Delco 132-55 (GM 14077122), and the truck still will not warm up above 160F. I have a Vintage Air system with a block off valve in the heater circuit, so there is no flow through the heater...
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