Question about 2003 GMC Sierra 2500HD

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Location where are the location of the 2 thermostats on a 2003 GMC 2500hd deisel motor?

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Right on top in the middle between the alternator and A/C compressor. The back t-stat has little vent holes that need to go towards the rear of the engine.

Posted on Jan 09, 2009

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Location of bank 2 on gmc 2500hd ?


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Feb 08, 2011 | 2003 GMC Sierra 2500HD

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Dec 17, 2009 | 2003 GMC Sierra 2500HD

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Where is the pcv valve on a 1992, 2.3L 4cyl. ford?


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Sep 01, 2009 | 2003 GMC Sierra 2500HD

1 Answer

Location of engine thermostats on 2003 ch2500hd turbo diesel


Check this location.
Between the alternator and A/C compressor, on the top. The other thermostat with vent holes goes toward the rear of the engine.
I believe the temp ratings are different for each.
Let engine cool before working on it.
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1 Answer

Need to replace thermostat on 2005 Chevy 2500HD 4x4


The thermostat is located in the water pump next to the 2 heater hoses. I think you have to buy the housing to get a thermostat. Not serviced seperately.

Feb 20, 2009 | 2003 Chevrolet Silverado 2500HD

1 Answer

Locating thermostats


Who told you this??????? There is only one Thermostat in your Truck. Follow the Upper Radiator Hose to the Motor. Remove the Housing that the Hose is Connected to and the Thermostat is Under the Bell Housing.

Jan 10, 2009 | 2001 GMC Sierra 2500HD

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