blocked colant passage gasket on wrong bad temp sen
It has a 195 degree Fahrenheit thermostat so runs around 195 to 215.
Yes, it controls the coolant flow around the engine block, without coolant the engine would overheat.
It cost me $80.00, Thermostat around $26.00 $4.00 for coolant & $50.00 for labor, its around 1 or 1/2 hr job.
There is usually an ECT (engine coolant temp) sensor and a CTS (coolant temp sensor) located around the thermostat housing mounted in the intake. One sends coolant temp to the guage, the other sends temp to computer.
The thermostat is a mechanical device that restricts the flow of coolant in order to allow the engine to reach it's operating temp more quickly. It then opens and allows coolant to flow but will hold the temp at whatever is the set limit of the thermostat, usually around 190 degrees. The gasket is what prevents it from leaking.
If the thermostat does not close properly, then the coolant will not get up to "normal operating temperature" usually around 190 degrees Fahrenheit, and the heater will not work properly. Heated air will only be about 140 to 150 degrees (cool) and fuel mileage will suffer also. The vehicle is designed to operate within a certain engine temperature range.
should be the same temperature as your thermostat rating...generally around 190 to 195 degrees.
If you look at the bottom of the thermostat you will see the spring wrapped around the valve that goes up & down to open & close the thermostat. The spring is made from heat sensitive metal and is what opens and closes the thermostat as it expands & contracts. If the thermostat is installed upside down, the spring will not be in the coolant and will not open until it gets hotter than the specified temp of the thermostat and could cause overheating problems and coolant flow issues.
* Thermostat housing not secured tightly * Gasket damaged or not put on properly * No gasket sealant(Permatex, etc) applied to gasket * Radiator hose not secured tightly
on a 95-98 its on th passenger side of the engine,follow the top radiator hose to the water neck.on the left side of the assembly is the thermostat housing, (looks just like the water neck),2 bolts i believe are 10 or 12 mm 1st drain coolant,remove thermostat housing, pull old replace with new,dont forget rubber gasket that goes around the thermostat, and you might need some liquid gasket to put in the channel around the thermostat.top off with coolant bring the car to running temp and check coolant resivoir(not radiator cap)
If everything else is normal, one way to reduce the engine operating temperature is by changing the stock thermostat to one with a lower temperature rating. This temperature rating is the temperature needed for the thermostat to open which allows the coolant to circulate around the engine.
A 2002 Ford Explorer, 4.0 , would have come from the factory with around a 192 * Fahrenheit engine cooling thermostat