94 chevy s10 2.2 i replaced the coolant temp sending unit and plug and when i turn on the ignition the gauge pegs out past 260 but when the sensor is out of the housing just hanging the gauge reads normal
SOURCE: Temp gauge
the sender for the gauge is on the cylinder head near the spark plug if you unplug it the gauge should stay all the way cold then ground it out it will go all the way hot if that reads like that replace the coolant sensor
SOURCE: temp gauge reads hot when cold
That wire you are unplugging is pinched and being shorted to ground ! You need to trace that wire until you find it . Also if anyone has done any repairs recently you may want to start looking in that area .
SOURCE: Gauge reads Hot but truck doesn't appear to be overheating - help
is antifreeze dirty looking and if was changed was it chemically flushed?
SOURCE: COBALT TEMP GAUGE READS 250 DEGREES BUT ENGINE
Probably the temp gauge itself. Most of the time it doesn't have a problem but sometimes they do go bad. Did the car ever overheat prior to changing the solenoid?
SOURCE: 2002 ford e250 5.4. engine temp gauge giving false
Well, it can be a sending unit issue, they are pretty inexpensive, so worth while to just replace it. Do be aware that the temprature DOES normally do what you describe. The condition is called heat soak, where the temp goes pretty high, due to no water circulation, after shutdown. This is normal and some vehicles run fans after shutdown to help. Usually not an issue with properly functioning cooling system that can hold pressure.
Remember the coolant recovery tanks? Their purpose was to recover teh small amount of coolant pushed out during heat soak.
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