Red and black wires are +12- volt, jumper the gray wire to ground to test.
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.
Probably the blower motor, wiring to it or control switch
The blower control module is defective.
The blower motor relay on a 1980 Cadillac Coupe Deville is situated on the passenger side. It is located in the vicinity of the firewall and is just below the windshield.
bad blower motor
On the fire wall. Behind the engine.
With that year deville...its more than likely the blower motor
blower relay 1992 Caddy sedan deville
AnswerDepends whats broken ie. blows cold, no blower at all ???????no blower at all
when i changed the bm everything worked fine.$60 for the part.
Defective Blower Motor Resistor Pack.
the blower motor is located on the passenger side of the interior under the glovebox.
HCAC fuse should be under the hood
might need to replace blower motor
behind the engine, next to the brake booster, a ring of 7mm screws finess it out wriggling it a little. replace the control module at the same time!!
Assuming that the a/c was in good shape before it suddenly stopped working, the problem is probably the blower motor. As it turns out, this is very common. Try searching answered questions under "blower motor 1997 Cadillac Deville" I just had to change mine in a 1996 Deville. Motor aprox. $240.00/Labor aprox. $100.
A bad resistor or a bad switch.
Open hood . Disconnect blower module located near blower fan. Disconnect, if blower shuts off, repalce module
Check to see if you are getting power to the blower motor - if so motor is defective if not problem in circuitry to blower motor
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.
under hood center of firewall / on my DHS it's under the dashboard on the passenger's side.
Should under dash on firwall near blower motor.
Right side under dashboard. Remove plastic cover then look for a Round plastic cover.
1991-1993 DeVille blower control module (power module) location If you are standing in front of the car with the hood open, look left of center on the firewall for a cover that says "Maxi Fuse / Relay Center" remove this cover (two 1/4 turn fasteners on the front and one sheet metal wingnut on the top near the hood hinge). Underneath the fuse and relay center, you should be able to see the blower control module (power module) bolted to the top of the evaporator / blower module. Wires to the connector are color coded; Black, Purple, white and red. Cadillac Man
It appears your blower motor is not working correctly on your 1980 Cadillac Coupe Deville. The vents are for both AC and heat. You may also be losing vacuum pressure. If you cannot find the source, your mechanic can help you do so.