Get the latest advice about your car

Get Started
Advice » Q&A » 1998 Mercury Mountaineer

Q&A

Ask Your Question

1998 Mercury Mountaineer

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

Question

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

2 Answers
Answer It
Flag This

  • Answer #1

    irvtech March 18, 2010, 21:53
    Profile_thumbnail
     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

    Reply
    Flag This

  • 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.

    Reply
    Flag This
Answer Ranks

This week's top 10

1 globalhelper 6 obdcar
2 milesauto 7 TimGoodreau
3 csubak30 8 raiderron
4 jose8889 9 Merrimack Auto
5 Autohaus Lake Norman 10 Camster