BUYER BEWARE Some GM 2002-2006 V8 motors have factory defects in the cylinder heads. See service bulletins, loss of coolant and no signs of leaks and heater blows cool air. Hedricks miss diagnosed my Tahoe and now that extended warrenty is out it could cost me over $3000.00 to repair.Poor GM and Hedricks customer service, with no help. I lost my faith with Hedricks and GM.
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