Question about 1999 Mercury Mystique

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I have a mercury mystique and it is overheating at lower speeds, what is the problem?

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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

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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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Hello, jeruel_javil and thank you for asking your question on Fixya!

Here is a simple process that will walk you through a few steps that will pinpoint the overheating problem on your
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How to diagnose your overheating
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Get more great money saving tips and tricks about your vehicle from: twitter.com/acoates23234

Thanks for the vote, and good luck!

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Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.Com!

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