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2003 chevy s10 gauge temp not reading

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Old 11-13-2010, 02:17 PM   #1
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2003 chevy s10 gauge temp not reading


hello everyone, my name is Carlos i am new here.I got a 2003 chevy s10 yesterday,yellow i think is the LS model with 58823 miles. everythin in the truck seems to be new,rides really smooth and all, no leaks or nothing like that.

MY ONLY CONCERN is that the temp gauge seems to not read the temp. like something it tries to go up and then drops back to 100 again like it plays back and forth sometimes. any suggestions what could it be?? i dont know anythin about this truck so any help would be great. i always owned hondas. currently have a 90 integra Da. thank you guys.
Old 11-13-2010, 07:15 PM   #2
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Re: 2003 chevy s10 gauge temp not reading

Check your coolant level. If you're running way low on coolant then the temp sensor reads low when theres no liquid in contact with it. Check this first, and before you drive it next IMO.

Or

You might have a bad or sticky Theromstat. I'm fighting the same issue in my 96. I had to replace the radiator that was cracked and my new one has almost 30% more surface area than the stock radiator and the coolant was being overcooled. I managed to fix that by blocking part of the radiator.

If the coolant level is correct then you might wanna try removing the thermostat, button everything back up (including the fan shroud) and let the truck idle for about 5 - 10 mins. Check to see if the coolant gauge fluctuates as it did before while its running unobstructed. If not then your temp sensor is working. (the engine will run cool but shouldnt fluctuate). The thermostat is like a 6 dollar part at autozone, i'd start there.

Either way, excessive cooling and heating of the engine block will compromise the integrity of your cylinder walls, I wouldnt take it on extended trips before you get it figured out.

Last edited by tiredoltruck; 11-13-2010 at 07:17 PM.
Old 11-14-2010, 02:48 PM   #3
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Re: 2003 chevy s10 gauge temp not reading

i refill the cooloant level cuz it was a lil low.. not so low tho! and again on a cold start it tries to moves and when i accelerate it flunctuates!! also. after a while it goes down to 100 and sits there.! so it prob s the thermostat that s staying open!! i got one in autozone along with anticoolant to do a radiator flush as well just to clean out the whole system and put a new thermostat and c if that fixes the problem!
Old 11-14-2010, 09:08 PM   #4
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Re: 2003 chevy s10 gauge temp not reading

OK I CHANGED THE THERMOSTATE AND STILL HAVING THE SAME ISSUE WTH???? THE GAUGE STILL DONT WORK.!!

I SCANNED THE OBD CODES AND IT TROWS:
P0118 - Engine Coolant Temperature [ECT] Sensor Circuit High Voltage
P0171 - Fuel Trim System Lean Bank 1

DOES ANYONE HAVE ANY SOLUTIONS FOR THESE CODES???
WHERE? IS THE ENGINE COOLANT SENSOR??? LOCATED ON A 2003 S10 2.2L ?

AND ABOUT THE PO171?? WHAT IS CAUSING THIS?? THE TRUCK SEEMS TO RUN REALLY SMOOTH IT DOES NOT SEEMS LIKE IS RUNNING LEAN OF GAS BUT I DONT KNOW?? HELP?
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