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I have a 2003 Chevrolet s10 4cyl that is overheating

I replaced the radiator and water pump, there is no foam or bubbles in the coolant and no steam from the exhaust so I don't believe it is a blown head gasket. It does not overheat in park, only while driving and it quickly cools back down when stopped (like at a stop sign.) Any input or info on known issues is appreciated! Thanks in advance!

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  • William Money Nov 28, 2012

    Just put in a brand new thermostat today (right after posting the question) it still has the same problem

  • Thomas Perkins
    Thomas Perkins Nov 28, 2012

    Maybe a blown head gasket.Your belt is turning properly.

  • William Money Nov 28, 2012

    Belt seems fine, no squeaks or squalls, all the pulleys are turning. I guess the next step is check the oil for water, it had a little trouble starting last test and the idle was fluctuating a bit. Any ideas? Thanks for your response thus far!



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  • Cars & Trucks Master
  • 14,384 Answers

Check your thermostat to see if it is opening and closing.

Posted on Nov 28, 2012


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GM Elec
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SOURCE: my monte carlo overheats when idle but no signs of a blown head gasket nor water in oil. the temp gauge will go up to half way then the radiator fans will come on. when i'm driving it will go down to

When the engine is "over heating" are the radiator cooling fans running on high speed?

Has there been any engine work performed on the vehicle lately?

Let me know.

Posted on May 01, 2009

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SOURCE: 2003 4.6L expedition overheating after 15-30

change the thermostat

Posted on Jun 21, 2009

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SOURCE: overheating after head gasket replacement

signs your water pump isnt workin i had same issue

Posted on Aug 01, 2009

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SOURCE: overheat, excessive preasure build up in cooling system

Have you changed the water pump ?

Posted on Jan 18, 2010

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SOURCE: 2001 dodge durango 4.7L SLT

Well the only thing you haven't replaced is the water pump. The impellar can dislogde from the shaft or completely disinerate. this is not common but I have seen it. Mostly the impellar spinning on the shaft. this is one of those jobs you just have to take it apart and see. No way to check it that I know of.

Posted on Jun 16, 2011

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