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take to dealership. there was a recall and they will fix it for free.

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โˆ™ 2006-06-30 18:19:30
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Q: Why would the air conditioner only work on high in a 2000 mercury cougar and high only works sometimes?
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What might cause the heater and air conditioner on a 1999 Mercury Cougar to cease functioning?

If you mean the fan - replace the fan speed resistor if the fan only works on high speed. Please supply more information - no heat or cooling? Does fan work? Does mode switch work?

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Why does the heater work intermittenly on a 99 Mercury Cougar?

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