Passenger side under the dash behind the glove compartment.
In a 1998 Lincoln Mark VIII : In the Power Distribution Box ( which is " live " ) located in the engine compartment ( # 29 is a 40 amp maxi fuse for the Blower Motor Relay )
The first thing that you need to check is make sure that you have both power and ground going to the blower motor itself.........
on the mufflers after the heads
Passenger side toward the firewall.
Passenger side up under the glove compartment.
Under the hood in the middle of the bulkhead
I had the same problem with my 98. My mechanic found a loose wire at the blower motor connection.
No
go to markviii.org. they have a answer for almost anything with the lincoln mark viii
If I'm not mistaken, it's behind the glove box passenger side.
First make sure that the wire to it isn't corroded off, known problem with the Marks.
Where to find the horn relay fuse for a 93 Lincoln Mark VIII