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1998 Mercury Mountaineer

Question: Can't get temp to change from heat to cold or if hot, switch wont't change to cool

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Silverbird, 5.0L V8, Turpin, OK, March 17, 2010, 12:28
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 Rookie

Temp on cold, weather got cold and we could not get temp to change to heat. Next day heat came on high temp and could not switch to cool. Has the three switches for blower, temp and whether using vent, floor or defrost. The blower switch and where air comes out work fine. Replaced the temp switch and still will not work. Any help would be appreciated.

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  • Answer #1

    irvtech March 18, 2010, 21:53
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     Journeyman

    You may have a broken blend door. These vehicles have a plastic door and it is actuated with a small motor. these doors break where they attach to the motor. If this is indeed the case you will have to have the complete heater/AC plenum chamber replaced, close to $1000.00 for this repair if the parts are still available. Good luck

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  • Answer #2

    Visitor, May 10, 2010, 07:49

    I have the same issue. The problem is the actuater that controls the air flow from hot to cold and back. It is probably sticking. The only way mine changes temps is if i turn the blower on the highest setting for about 5 seconds and you will hear it pop.

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