FINDING ECM 99 MURCURY MOUNTAINEER - 1999 Mercury Mountaineer

First make sure the brakes are free. Check to see if the cable is moving the shifter lever on the transmission. Is there enough transmission fluid?

It is located in the under hood fuse / relay box (BJB) Relay #6

https://www.manualowl.com/am/Mercury/2001-Mountaineer/Manual/3894

You need special tools to remove the stock radio. Looks like an allen wrench bent into a U shape. Fits into the two holes on both sides of the front of the radio. Then its just a matter of connecting the new radio to old harness. Easier if you have an adapter from Crutchfield or another company.

Replace thermostat.

dont know of one get a new battery

Not until you install a new or fully charged
good battery

Change fuel filter.

I had the same problem with my 2002 Mountaineer at about forty thousand miles. Murcury replaced the steering column free under warranty. I now have ninty two thousand miles and it's back. The rear end is making a whining noise, the tranny is starting to slip, and the rear window regulator went out. Why did we buy a Mercury?????? Disgusted Dave!!!

check for a short by the starter exhaust melts these wires together good luck