The temperature gauge is showing hot when driven after several miles on my 1999 Pontiac Montana. It's had the water pump, intake manifold gasket. belt, and thermostat replaced plus radiator repairs. I'm still having the same problems. If I let the car warm up before driving it, it doesn't have this problem as much. When I reveve up the motor sitting still, the temp gauge goes back down. What kind of gasket does it need? Could it have other problems as well? HELP!!!!! It's driving me crazy!!!
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Sounds like vapor lock. This is when the fuel turns into a vapor before reaching the engine (it needs to be in a liquid form). This is usually due to high temperature from the engine and environment. I would have someone check it out.
If the gas gauge does not work correctly and the temp gauge reads hot, you could have a problem with the instrument panel. Both gauges get power from the same circuit, but each gauge is grounded by its own sending unit. If the temp gauge is reading correctly, you could have air in the cooling system and it is not actually full of liquid coolant.
It sounds like the temp sender may be bad. This is the sensor that sends a signal to the gauge on the dash (as opposed to the engine coolant temperature (ECT) sensor that goes to the ECU instead.) It is located on the bottom front of the thermostat housing (which you will find if you follow the large hose from the top right of the radiator.)
Before replacing, make sure the connection is clean and secure, then check the wiring for any obvious failures.
Its definitly a bad reading, you would know if your vehicle is overheating, you can usually smell it right away.I would say its your temperature gauge sending unit is defective, check the wires to see if they are well connected or broken. ask a backyard mechanic for assistance.
hi to test remove the wire off the tempeture seender unit get someone to watch the gauge and earth the senders wire the gauge should go straight over to hot if the wirings and gauge is ok then replace the switch yates210456