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2001 Chevy S-10 intermitant overheating

Tiny
1931CHEVY
  • MEMBER
  • 2001 CHEVROLET S-10
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 131,000 MILES
The truck had a cracked radiator so I replaced it. It never got hot before (until the water was low). Since replacing the radiator, radiator cap, thermostat, water pump, the truck intermitantly gets hot - up to about 240.

The fan clutch appears to be fine. This is the only thing I haven't replaced. I checked the hoses to make sure they weren't collapsing and they are fine. I jacked the front of the truck up to get the air out of the engine and believe that I did.

I am stumped - what am I missing?
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Tuesday, September 22nd, 2009 AT 10:36 AM

10 Replies

Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok this may sound redundent but have you checked it to make sure the radiator is completely full. You may have a air pocket at the thermostat.
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Tuesday, September 22nd, 2009 AT 10:43 AM
Tiny
1931CHEVY
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  • 6 POSTS
I have done that 2 times. It never took any more fluid.
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Tuesday, September 22nd, 2009 AT 11:05 AM
Tiny
RACEFAN966
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Ok so what kind of thermostat did you get? It may be that the thermostat is sticking sometimes. Get back to me.
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Wednesday, September 23rd, 2009 AT 9:34 AM
Tiny
1931CHEVY
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  • 6 POSTS
The thermostat is a 195 degree - I do not recall the brand name.
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Wednesday, September 23rd, 2009 AT 10:44 AM
Tiny
RACEFAN966
  • MECHANIC
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Ok that is the temp it should have. Do you have access to an infered thermometer? If you do then check to see what the temp is it may also be that the temp sender isn't sending the right signal. When does it get hot? Is it only when you climb a hill or sit in traffic or?
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Thursday, September 24th, 2009 AT 9:31 AM
Tiny
1931CHEVY
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Did that. It registered 240. I have even changed the catylitic converter and nothing! Just yesterday I put in a new fan clutch and a cooler thermostat (165) and it still is getting up to 210.
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Thursday, September 24th, 2009 AT 3:37 PM
Tiny
1931CHEVY
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  • 6 POSTS
Correction - is getting up to 230 and it should be at 210.
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Thursday, September 24th, 2009 AT 3:37 PM
Tiny
RACEFAN966
  • MECHANIC
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Go back to the 195 thermostat. With a cooler stat you will get very bad mpg. Now with that I would like you to check the upper hose temp compared to the lower hose temp at opperating temp. Let me know what you find.
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Friday, September 25th, 2009 AT 9:09 AM
Tiny
1931CHEVY
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Will do.
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Friday, September 25th, 2009 AT 9:29 AM
Tiny
RACEFAN966
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Ok great let me know what you find with the temp difference between the upper and lower hose when you can. Thanks.
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Friday, September 25th, 2009 AT 10:06 AM

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