Question about 1999 Mercury Mystique
Although your car is overheating at lower speeds only, and the help dougs78bu gave you is mostly likely your problem, owners of '98 and earlier Mystiques with the 2.5L V-6 engine need to be aware that those models used a water pump with a plastic impellar that was prone to breaking. When that happens, the car will quickly overheat at any speed, and the heater will blow cold air. Unless you shut the engine down quickly, permanent damage can be done. The fix is replacement of the waterpump with a newer model with the improved impellar design.
Posted on Dec 12, 2008
Can you verify that the radiator fan is coming on when needed? Your Mystique has an electric radiator fan. A sensor on the engine tells the computer to turn on the fan. If it is overheating in traffic or at speeds lower than 45 mph, you fan is probably not working when it should. Your mechanic should be able to tell with a scan tool if the computer is turning the fan on or not. Most likely culprit is the fan relay, but I've seen these with a bad fan motor also.
Posted on Sep 21, 2008
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