Question about 2003 Chevrolet Silverado 2500HD

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2003 chevrolet hd diesel 6.6-thermostat location and replacement

Posted by Anonymous on

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5 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 718 Answers

SOURCE: 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.
Clean up an spilled radiator fluid. It will destroy pets liver in 24 hours if they drink it.

Posted on May 31, 2009

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ftw1952
  • 10319 Answers

SOURCE: Diagram of thermostat location on 2004 Chevrolet

the 2,4 DOHC theremostat is located way down under the engine you can say enclosed in a steel tube with the bolt flange surrounding it. I do not have drawings for you, sorry. The 2.2 will be on the head cylinder

Posted on Feb 05, 2010

c17hydro
  • 2984 Answers

SOURCE: 2003 CHEVROLET SILVERADO 2500HD 6.0

4.8L, 5.3L & 6.0L Engines

  1. Remove the air inlet duct.
  2. Drain the cooling system.
  3. Remove the radiator outlet hose.
  4. Remove the thermostat housing bolts.
  5. Remove the thermostat from the water pump housing.

The O-ring seal is integral to the thermostat housing



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Thermostat housing-4.8L, 5.3L and 6.0L engines


To install:

  1. Install the thermostat to the water pump housing making sure the spring side is inserted into the engine.
  2. Install the bolts.
    • Tighten the bolts to 11 ft. lbs. (15 Nm).
  3. Install the radiator outlet hose.
  4. Fill the cooling system.
  5. Install the air inlet duct.
  6. Test the system for leaks.
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Posted on Nov 13, 2010

  • 94 Answers

SOURCE: location of thermostats on 6.6litre diesel

Top front of engine there inside a housing there is a heater tube going to them.

Posted on Feb 02, 2012

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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.
Clean up an spilled radiator fluid. It will destroy pets liver in 24 hours if they drink it.

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