1997 Chevrolet S-10 running hot

TOMIE

MEMBER
1997 CHEVROLET S-10
115,000 MILES

I have a 97 chevy s10 4.3 X code my question is this I know the head gasket is fine and there are no leaks, I replace the heater core, all hose's, water pump, thermostat, and flushed the system three times I also did a pressure test and it was fine, but the temp gauge still reads hot (red zone) after 5 minutes could it be the coolant sensor

5 Replies

JACOBANDNICKOLAS

MECHANIC
109,747 POSTS

If the gauge reads hot and the engine isn't actually overheating, that would be my first guess, the sending unit.

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Friday, July 26th, 2013 AT 7:06 PM

TOMIE

MEMBER
3 POSTS

Also fallow up would the fan clutch cause this also, I thinking about just changing both but money is tight I have 3 triplets that are 4 months old.

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Saturday, July 27th, 2013 AT 9:47 AM

JACOBANDNICKOLAS

MECHANIC
109,747 POSTS

If the fan clutch is bad, it could cause the engine to overheat when in stop and go traffic. However, at highway speed, it shouldn't happen.

Congrats on the triplets!

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Saturday, July 27th, 2013 AT 6:09 PM

TOMIE

MEMBER
3 POSTS

Thanks for the congrats on triplets I feel kind of stupid I found a pin hole in water outlet thermostat housing would cause over heating by letting air in wouldn't it

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Sunday, July 28th, 2013 AT 11:56 AM

JACOBANDNICKOLAS

MECHANIC
109,747 POSTS

Are you sure it wasn't losing coolant there? The system is pressurized when it gets hot. Has the coolant been getting low? Also, is there a reason you feel there may be an air blockage in the system?