when i turn my car on the gage will go to the C and will never go up. but when i turn it off it just drops down way below the C. so i no its not broke because it still moves. i replaced the censer and still nothing what could it be?
Pull the wire off of the sensor and ground it. The gauge should peg at full scale. If if does not, either the gauge is faulty or the wiring between the sensor and the gauge is faulty. Isolate that by checking the sensor wire with an ohm meter. It should read 0 ohms end-to-end. If it does not, clean the connections or replace it as needed. If it does read 0 ohms, the gauge is faulty.
The fact that the gauge goes to center scale when you turn on the engine does not necessarily mean that the gauge is working properly. It's a center-weighted gauge that has 2 internal windings. If one of them is open it will either go to center scale and never move again, or will not move at all from the power-off position.
If the gauge DOES deflect when you ground the sensor wire, the sensor is either bad or was improperly installed. If you used ordinary gasket sealer on it it may be insulated from ground and the gauge will not work. You can get special electrically conductive sealant to install screw-in temp sensors or you could remove it and clean off as much of the sealer as possible and install it with a VERY light amount of sealer. Check for continuity between the body of the sensor and any clean ground point. It should show 0 ohms.
There's also a chance that the instrument panel voltage regulator is bad, but if that fails, both the fuel gauge and the temp gauge will fail. If the fuel gauge is working properly, that's not likely the problem.
Its working just fine, and be glad that it is. Your engine isnt warming up. This is very common in Ford engines especially once they aquire 100k miles or so. This is actually a good thing for cars with a little age on them because the engine will last longer. Look at it this way, if your engine never gets hot, you really dont have to worry about ever warping a head, gasket shrinkage, or radiator fan wearing out. your heater hoses are going to last alot longer too. =D
the only sucky part is during the winter when you cant get any heat going lol
Ive had a ranger with a v-6 and Ive had 2 Vic's with 4.6 and they all did the exact same thing. They all went past 200K miles too