No, there is no fuse, it is self contained.
get a new blower motor
It's close to the blower motor.
A 1998 Cadillac Deville does not have a blower relay. The system has a fuse and a controller to feed power to the blower motor.
If you have checked the blower motor and it does function when power is applied then I would suspect the Blower Motor Resistor Pack is defective. It is also possible the blower motor speed control is bad, but highly unlikely.
Blower motor speed resistors are generally located close to the blower motor.
Built in the fan blower/motor.
bad blower motor
Ground the motor housing on the new motor and see if it works then
The blower motor fuse protects the blower motor electrical circuit. The blower motor relay operates only the high speed function of the blower motor. The blower motor speed resistor operates the lower speed functions of the blower motor.
faulty blower module. Under hood not far from blower motor
Inside dashboard in path of air that blower motor blows.
Probably the blower motor, wiring to it or control switch
Blower motor fuse is blown. Blower motor resistor burned out. Blower motor switch bad. Blower motor bad.