1997 mercury mountaineer overdrive light won't illuminate with he

SOURCE: NO OVERDRIVE

I had a similar problem with my 98 mystique when i bought it used. I had no overdrive and was lucky to find a honest transmission shop that found the problem. In my case the overdrive was unplugged. They plugged it back in,cleared the computer and changed my tranny fluid and i was good to go. You should be revving about 2400rpm at 65mph. The other thing you can check is to make sure that the wires that go from the overdrive button are not broken off or coroded.

SOURCE: In 97 mercury mountaineer, how to turn off "check engine" light

Go to the local parts store, have them check the codes (they will do this for free usually). It will tell you what sensor needs to be checked/replaced. Once the part is replaced, it will clear on its own. They can also reset the code, but it will come back if the trouble persists.

Marvin

• 85242 Answers
• Posted on Jul 01, 2009

SOURCE: Automatic headlights 99 mercury mountaineer

remove the photo sensor module on the top of dash, looks like a tiny plastic eye or lens.

Marvin

• 85242 Answers
• Posted on Feb 18, 2010

SOURCE: 1997 Mercury Mountaineer What is Catalyst Efficiency Below (Bank

it means the catalyst is worn out, the efficiency is monitored by sensors, when the Cat falls below a certain reading or "threshold" the code is generating telling u that u need a new catalytic converter.

SOURCE: Heat does not work, makes loud clicking noise when

I have a 2003 Mountaineer that had the same symptoms. After doing some research, me and Google decided it was the Blend Door Actuator. It is a fairly difficult job due to having to take pretty much the whole dash off, but I did it myself with minimal experience. I included a few links.

http://redhouseon7th.com/redhouse/howto/2003FordExplorerBlendDoor/ (This is the guide I used.)

http://www.explorerforum.com/forums/showthread.php?t=212667

Good luck!