• Tiny
  • all_Romeo
  • 2000 Mercury Mystique
  • 4 CYL
  • 2WD
  • automatic
  • 180,000 miles

I recently purchased a 2000 mercury mystique.
First thing in the mornings or during the day, it hesitates to turn on. It also stalls while driving or accelerating.
I immediately replaced the fuel pump, fuel filter, battery, and spark plugs.
If it helps any, I notice the fan (radiator fan?) Comes on when first turned on even when the car is cool, and the fan pretty much stays on all the time car is on or driving.
I have even tried different fuel cleaners such as Seafoam to removes fuel additives, but to no avail.
Dont want to send you on a wild goose chase, but I know I need to replace the heater core and the a/c compressor clutch. Maybe this explains the fan being on all the time?
There is no check engine light on, so how can I check any sensors?
Thank you for your help.

Thursday, November 11th, 2010 AT 11:18 PM

1 Answer

  • Tiny
  • Expert
  • 19,554 posts

Vacuum leak is a very common issue
intake manifold and gasket is very common failure and 1st to check

if low on coolant that also may cause rough or unstable idle

Was this
Friday, November 12th, 2010 AT 1:07 AM

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