Temp skyrockets as if the thermostat is not opening

Tiny
ERIC G
  • MEMBER
  • 2003 CHEVROLET TRAILBLAZER
  • 84,000 MILES
I just changed the thermostat and housing in my 2003 Chevy Trailblazer with the 4.2 liter. Everything went smooth. As I ran it, I noticed I do not get heat and the temp skyrockets as if the thermostat is not opening. Did I forget to do something or is there something else? Coolant is also a little low, 1/2 gallon or so, can that be the problem?

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Thursday, February 9th, 2012 AT 11:13 PM

6 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
-Did you bleed the system -if not do so-start here
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Thursday, February 9th, 2012 AT 11:21 PM
Tiny
ERIC G
  • MEMBER
  • 3 POSTS
How do I bleed the system?
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Thursday, February 9th, 2012 AT 11:26 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Are u sure u installed the proper degrees stat. How hi of overheating.
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Thursday, February 9th, 2012 AT 11:27 PM
Tiny
ERIC G
  • MEMBER
  • 3 POSTS
I installed the one the auto parts gave me for that make and model. The temp needle almost pinned after 10-12 minutes of running.
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Thursday, February 9th, 2012 AT 11:30 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Bleeding the Cooling System

Allow the engine to cool down to ambient temperature.

Open the radiator cap.

Turn the engine on and turn the heat to max. Turning the heat to max allows the radiator fluid to circulate through the cooling system to ensure that all air pockets are eliminated from the system.

Rev the engine to 2,000 RPMs and hold for approximately 10 to 15 seconds and repeat two to three times. This will allow the radiator fluid to circulate throughout the whole system and ensure that all air pockets exit the radiator.

Gently squeeze the upper radiator hose approximately 6 to 12 inches from the radiator cap. Squeeze about five times. This will bring more air pockets up and out of the radiator and will ensure that the engine does not overheat.
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Thursday, February 9th, 2012 AT 11:33 PM
Tiny
ERIC G
  • MEMBER
  • 3 POSTS
Thank you! I'll try that 1st.
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Thursday, February 9th, 2012 AT 11:40 PM

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