1990 Mercury Sable Heat stays on

1990 MERCURY SABLE
95,000 MILES • 6 CYL • FWD • AUTOMATIC
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KRRG
  • MEMBER
  • 2 POSTS
My car's climate control is stuck on 95 degrees and the fan won't shut off. The same hot air blows when I put the A/C on also. Even when I turn off the fan switch, it still blows hot air
Mar 5, 2009 at 6:43 AM
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JGAROFALO
  • ✓Experienced Mechanic
  • 489 POSTS
The common problems here are the blend door motor and the control assembly. Problems of this nature require very specific diagnostic procedures to pinpoint causes. A shop manual is in order. You can usually find them on eBay for reasonable cost.

Of course, there is the "seat of the pants" method. For a start, I would try getting a used control assembly from a salvage yard. I thisk that should be your number one suspect.
Mar 13, 2009 at 9:57 AM
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