Question about 1999 Chevrolet S-10 Pickup

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Thermostat will not open

The truck is a 96 sonoma 4 cylender 5 speed

after i replaced the cooling fan pully bracket and waterpump the thermostat will not open. i tryed 5 different thermostats. the antifreeze is getting to the thermostat but not past it.

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  • 3 more comments 
  • jj12903 Feb 05, 2009

    yes spring down

  • jetfixr May 11, 2010

    How do you know the thermostat is not opening?

  • Allison Hulbert May 11, 2010

    how can you tell it is not getting past the thermostat

  • ccn7 May 11, 2010

    you may have a air pocket in the system.

  • djos15 May 11, 2010

    Did you put thermostat in the right direction?

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  • 508 Answers

If the top radiator hose is not getting hot you know the coolant is not passing the thermostat. The last gentleman to answer you is probably correct. The thermostat must face the correct direction for the hot water to open the thermostat.

Posted on Feb 07, 2009

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