It sounds like the temp sender may be bad. This is the sensor that sends a signal to the gauge on the dash (as opposed to the engine coolant temperature (ECT) sensor that goes to the ECU instead.) It is located on the bottom front of the thermostat housing (which you will find if you follow the large hose from the top right of the radiator.)
Before replacing, make sure the connection is clean and secure, then check the wiring for any obvious failures.
SOURCE: Temp gauge goes from cold to hot.
You can remove the rad cap and run the engine ( do not remove cap when hot!! ) You should be able to see the coolant circulating in the rad. You can also remove a heater hose and hold upwards and start engine, if coolant flows out the pump is circulating. If all looks good at that point I would start to suspect a cylinder head gasket leak and / or cracked cylinder head. Hope this helps .. Good Luck
SOURCE: antifreeze and water leaking from drivers side
the water pump is likely leaking, don't drive this until the pump is replaced, u run the risk of total failure and a damged engine
SOURCE: 1998 mercury mystique cooling fans
The low speed side is of the fan motor is probably defective, replace the motor.
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