I just changed the thermostat (the old one was stuck open) on my 96' Explorer. The temperature gauge will fluctuate now, getting pretty hot then dropping kinda cold. It will stabilize after you drive for a while. There is so much coolant that I think this is a way to get it all warmed up? I'm not sure, I used to have a Honda. I do know that the Exploder is running better, getting better mileage- so everything seems to be fine.
Temperature gauge fluctuations can be caused by issues such as a faulty thermostat, low coolant level, air pockets in the cooling system, a malfunctioning temperature sensor, or a failing water pump. It is important to address these issues promptly to prevent potential damage to the engine.
On a 1997 Ford Explorer : CHECK ENGINE is just to the left of the " C " on the engine coolant temperature gauge ( Helpfull )
Either your engine coolant temperature is too high , your oil pressure too low , or your gas gauge is near or at empty
engine coolant
For a 2001 Ford Explorer : No , there is an engine temperature gauge Also , there is a " CHECK GAGE " light ( the light will come on if the engine coolant temperature is too high , the engine oil pressure is too low , or the fuel gauge indicates it is at or near empty )
I was looking at the 2004 Ford Explorer Owner Guide and it has a picture of a instrument panel that shows a " check gage " light in the upper left corner by the engine coolant temperature gauge . The light comes on if the engine coolant temperature is high , the engine oil pressure is low , or ( the fuel gauge is at or near empty )
Bad gauge or defective coolant temperature sensor
water temperature. 180-220 degrees
Low Coolant or faulty gauge
The check gage light comes on if the engine coolant temperature is too high , the oil pressure is too low , or the gas gauge is at or near empty
Your engine coolant temperature gauge has a sensor ( there is also a engine coolant temperature sensor that is used for the computer / PCM )
It has a " check gage " light if the fuel gauge is at or near empty , the engine coolant temperature is high , or the engine oil pressure is low