Engine will over heat unless AC is on, fuses are good.
There are two fans, one comes on with the air con, the other when operation temp is reached . check fan fuse and censer if ok check fan motor.
SOURCE: Engine cooling fan not turning on.
actually the contour and mystique both have this problem they tend to overheat and ruin engines and transmissions when the fan quits working the best fix is a kit you get from ford or advance auto parts it makes the coolong fan run all the time the engine is on and this will save you lots of problems in the future, not only am i a master automotive tech but i have owned 6 of these cars. the 96 mystique beng my favorite. mercury version. good luck james
SOURCE: Cooling fan cuts off
The fan relay is not functioning correctly or the new sensor is defective.
SOURCE: 98 Mustang v6 - no AC
Make sure the radiator pressure cap is the correct one and that the hose is not soft--check the lower hose and heater hoses for softness as well. They should be firm, but not hard or cracking. The temperature sensor is reporting normal operating temperature, so it and the thermostat are working correctly (hot water would blow out of the radiator if it were stuck). Check the cooling fan for free turning and no noise. Check it's grounding connection. Check the fuse box for blown fuses to the fan and to the A/C compressor. Make sure all the relays and fuses are firmly pressed into their sockets. Check the A/C compressor clutch winding for resistance--should not read infinity. Does the blower motor for the heater/A/C run when either is turned on? The A/C switch on the dash may be defective.
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SOURCE: engine cooling fan not working, fuses are still
Fan relay needs to be replaced. It is on or near drivers side strut tower.Good luck!
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