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Hi
i suppose i have to ask how it is that you know these temperatures are different?
is the car actually overheating?
Have you had it scanned for any fault codes?
You may have a defective temp guage...check it by removing the sender plug and see if the guage falls totally to zero...earth the guage wire and see if the guage goes to max.
Roger
It may happen due to faulty sensor or any crack in the wire or may be due to the improper wiring or any problem in the wiring due to rash driving.It is best to consult a mechanic or technician to solve the problem.
Answer to second question: It appears that that the wire to the coolant Temp Sensor has developed e short to the chassis somewhere which is giving the Max reading on the guage. Check the wiring in the engine bay around the Thermostat area for chafing or if the wire to the sensor has become disconnected and is touching the engine. The cooling fans normally are turned on by another sensor either near the temp sensor or on the radiator. Check the wiring around those places as well.
There are two pieces on your car for temp related functions. There is a temp sensor which you replaced but there is also a colling temp switch. The sensor feends the ecm and works with the fuel system. It does not control the guage. The switch is what controls the guage. Thats what you need to replace. In the even your car is one of the rare one that only uses one sensor then you need to check the wires going to and comming from the sensor. You will probably find a loose or corroded connection somewhere in the line.
Try a full tune up.. get Bosch platnium+4 spark plugs and Acel wires, do the fuel filter and air filter(i suggest K&N) buy some fuel injector cleaner or use Marvel Mystery oil. The ECU could e gone but hard to diagnose if the car needs a tune up.
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