you need to change your thermostat
Its the blend door. It happened on my 98 Mercury Mountaineer. The motor shaft and the door have separated there is an easy fix look up blend door fix for 98 Mercury Mountaineer it just needs a small finishing nail and done
replace it.
I have mercury mountaineer 4x4 03 had grinding noise easy fix remove the shaft which connects the transmission to the rear end
Try replacing the upstream O2 sensor
spray your door latches with wd40.
Check the fuses under the hood on the driver's side.
I'm having a hard time also the doors have child protections lock on them.
The first thing to do is check your fuses. It may be a very simple fix.
I have a 1998 Mountaineer and had the same problem. There was dust in the electrical connections. All the dealer did was blow it out and charge me an outragous service fee
My 1999 Mercury mystic was in a accident ad afterwards the the body shop repaired the damage the air will not work after it was charged. what can be done to fix the air
yes
How to "fix" doesn't tell us nearly enough. Much more information re. what exactly the problem seems to be, is needed for a good answer