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Hey everyone, so my buddy has a 1998 chevy S 10 LS base model 4 cylinder 2.2 liter 5 speed with manual transmission, and he’s having some odd temperature gauge readings. I’ll start here, his gauge always has read at about 207-208 until just recently. Granted, it has been well over 100 degrees here in california. His issue is that it will stay around that temperature, after driving it about 15-20 miles, the gauge creeps up to the 3/4 mark. If he stops and idles, it will go back to the range of 207-208.
He has flushed the cooling system, changed the thermostat, checked for leaks, no mud or gunk came out while flushing, he’s cleaned the radiator fins, cleaned between the radiator and the condensor, the water pump was replaced about 3 years ago, but shows no real sign of the pump going bad. The fan seems to run at full speed. No issues as if he has a blown head at this point. He also says he has double checked the radiator for cold spots, and says there is none.
Any suggestions? Help would be appreciated!
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It may be a problem with the gauge itself. If you can get your hands on a scan tool that reads live data, check the coolant temp reading there. If it’s different from the gauge reading, there may be a problem with the gauge circuit.
Good luck and keep us posted on what you find.
Have a similar issue with my temp gauge in my 2002 Blazer, it will read 207 ish then will drop low, and then shake and climb up to over 210. I put a scan tool on it and read live data. It was holding a constant temp. These gauge clusters are known to have issues at least from what I see. Eric is spot on with his reply.
in agreement with them, either its the gauge in the instroment cluster itself, or its the coolant temperature sensor, plug a scan tool in and look at your live data if you can, see where your engine temperature is, at idle at a stand still engine temp should be between 190-220 degrees, if you see high fluctuation on the live data it may be your coolant temperature sensor, if you see it just on the gauge, it may be the gauge on your instroment cluster.
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