I AM OVERHEATING PUM THERMOSTAT AND FAN RELAY ALL OK ,WHAT AM I MISSING?
2005 GMC Sierra
September, 23, 2012 AT 7:06 PM
I have a 2005 gmc sierra with a 4.8 vortex engine. It recently began to overheat.I checked the water pump but it gives no sign of failure, I replaced the thermostat and the fan relay but it still is running hot. What do I try next?