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The causes of this are many and seldom the same. Please read the info at the link to better understand what to check. If the engine is really overheating the check engine light will come on. Common Causes of Overheating ASC Industries Inc
You need to find out the fault code that is stored that is causing the check engine light, the whole thing may be related to one failed part like the temperature sensor or the wiring to it.
Well sounds like first start your car record where the temp needle reads, then let the engine warm up (with out driving) then rev the engine to about 3500-4000rpm a couple times does your needle move at all record then hold your rpm at 3500 for about 5-10 sec does this get the gauge to drop? sounds like you may "if not over heating at all and coolant level and circulation is good" have a circuit problem, you can test this by going to auto zone and ask for a scan to be done on your car when the plug into your OBD 2 ask them to go into DATA STREAM and then check to see what temp your ECM thinks the engine coolant is at does it match your gauge at idle and at 3500rpm if not its a faulty circuit
Check your coolant level. When the level goes down, the heater is usually the first unit to show the lack of coolant (no heat). As the coolant decreases, eventually the temperature sensor is intermittently 'out of the water' and can't indicate water temperature, causing the fluctuation. If your coolant is low, find and repair the leak.
A "check gage light" typically indicates a faulty reading on one of the gages located on your instrument cluster. After starting your vehicle, observe your instrument cluster if one of the indicator needles on the instrument cluster remains all the way to the left or "pegs" out all the way to the right, it may be the cause of your fault. The exception is the coolant temperature gage it will take 10 to 15 minutes after which the needle should rise to a normal position. Correcting the "faulty gage light" will depend on which gage is malfunctioning. Once you have figured out which gage is causing the check gage light to illuminate, then we can proceed to correcting the problem causing it.
check the coolant level - you may have low coolant, causing the sensor to occasionally read an air pocket. If you don't correct this you will burn out your motor.
We had this problem & eventually replaced both the thermostat and radiator cap, being careful to bleed out any air pockets by running the engine form cold with the heater on hot and the radiator cap off - keep watching & topping up the coolant as the enigine heats & the thermostat opens.
Good luck!
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