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1990 S10 4.3 temperature gauge reads High replaced both sensors and thermostat.

(1990 Chevrolet S10)
in Gainesville, FL on April 12, 2018
Engine runs fine doesn't seem to overheat problem started by four five weeks ago the temperature gauge would heat up above 220 and then all the sudden drop back down to where it was supposed to be and then go back up again and come back down and it got worse and that goes all the way up to 260 and the check gages light comes on but the engine does not seem to be overheating
Tags: chevrolet, s10
Displaying 2 answers & 2 comments
Popular Answer
on April 12, 2018
Was the temperature gauge *sending unit* on the drivers side cylinder head replaced?

Is that one of the sensors you’re referring to?

Defective ‘new’ thermostats are not uncommon.
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on April 12, 2018

‘IF’ overheating occurs going up a long hill - radiator restriction is prime suspect.

‘IF’ overheating occurs while sitting still or in slow traffic - radiator cooling *fan clutch* is prime suspect.

The more details we get - the more accurate answers we can offer!
on April 12, 2018
I replace the waterpump about 2 years ago I have a stamp thermostat now this is the fourth thermostat that I've had three cheap ones and this one it does it sitting still idling or going down the road. The sending unit was on the passenger side and the one right in the middle by the thermostat housing
on April 12, 2018
This could be a few things but you need to verify if the engine is actually over heating or if it's a gauge issue. You can order a cheaper laser temperature gun online. Point it to where the coolant temp sensor is and see if it lines up with what the gauge is reading. If it is indeed over heating then you need to start with basics like making sure the fan is workings, the radiator isn't clogged and the water pump is pumping.

Alex
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