The temp gauge goes from 100 and jumps clear to 260 without stopping anywhere in between... I know its not over heating because the problem starts when i first start the engine in the morning and lasts all day
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Re: Temp gauge isnt working properly
Try replacing the temp sensor.......its between the first and second spark plug on the drivers side of the engine........should have a single wire going to it.........on second thought check the connection to it first if that's good then replace the sensor.
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The first hing I would do is confirm the engine temp with a scan tool. If the scan tool is reading a normal temp, 200 to 220 degrees with the fan coming on at around 220 degreese, and the gauge us reading much higher than the gauge is most likely bad.
If the fans are not coming on than you need to look into that. Fuses, relays, wiring, fan motors would be the basic things to check. If you need more help with figuring out the fans let me know.
If the fans are coming on, the temp gauge is reading the same as the scan tool data that there are a couple of possibilities.
Either the system has air in it from nepot being properly bled or the headgket is bad forcing air into the system. Air will cause the cooling system to lock up. If you are try ing seeing the temp gauge spike to 260 degreese the head gasket is likely to have or will fail soon.
Like I said if you have any further questions let me know and I'll be happy to help.
It sounds like your thermostat is sticking. You can tell when it sticks when your temp gauge spikes high and your blower won't blow heat and when it finally opens your temp gauge goes back down and you have heat again.
You didn't say what kind of car it was, but with no heat and high readings on the gauge, my guess would be your coolant level. If that isn't the problem, then try replacing the thermostat. Other possibilities would be a defective temp sensor, or a bad electric fan on the radiator.
the aux fan only works when the ac is on, and has come to a predetermined temp(?) i found this out while going up a long grade in the back country without the ac on and later found out the radiator was half plugged!
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