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How to fix, 1998 Mercury Mystique stuck in default defrost?

Tiny
HUTCH
  • MEMBER
  • 1998 MERCURY MYSTIQUE
  • 90,000 MILES
1998 Mercury Mystique stuck in default defrost, how can I repair this problem (IS THERE A VIDEO & WRITTEN INSTRUCTIONS ON HOW TO FIX THIS PROBLEM). Thanks again!
Friday, April 20th, 2012 AT 10:54 AM

3 Replies

Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
This is caused by low vaccum. Youll need to check the vacuum at the servo that controls the defroster door.
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Friday, April 20th, 2012 AT 11:22 PM
Tiny
HUTCH
  • MEMBER
  • 6 POSTS
Hi, cadieman! HUTCH here, this servos your talking about, is this located inside under dash by heater core? Is this also called something like a check valve, where I have to remove the inside center console? HOW DO I CHECK THIS? HELP ME OUT WILL YOU? I really appreciate all the help! Thanks again! HUTCH
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Saturday, April 21st, 2012 AT 2:32 AM
Tiny
CADIEMAN
  • MECHANIC
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The servo is the one by the heater core. Youll need a vacuum tool check the vacuum at the hose. Then u check the servo for proper oper. You pump the tool and the servo operates in and holds vacuum wthout loosing air.U will have to check the vacuum in the sys.
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Sunday, April 22nd, 2012 AT 10:41 AM

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