If you are talking about the blower relay for the fan motor because fan motor does not work, and you find out this is not the problem, I have a 1999 silverado where the fan motor stop working. Replaced the dash switch, did not fix the problem. Figured fan motor was bad. While attemping to remove the fan motor under the dash, there was a plastic cover attached to the motor which I removed and found a small circuit board that was showing a burnt spot. Replaced this circuit board first before going futher. This fixed my problem. Cost for the board from the dealer at the time (2005) was $30. Had I known about this board, could have save myself $165 replacing the dashboard switch.
The 1998 Dodge Neon does not have a relay. It does have a blower motor resistor that could be bad.
The high-speed relay is part of the blower resistor board, mounted in the air duct behind the coolant/washer bottles. Follow the wires from the blower motor, they lead to the resistor connector block that the blower resistor board is plugged into.
check for voltage at the blower motor on all settings. if no voltage check the blower motor resistor or relay. if it has a resistor it will be right beside the blower motor, if it has a relay it will be the relay on the firewall under the hood.it will probably have a purple,orange,blue,and black wires.
On the evaporator case.
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.
The blower motor resistor is generally located close to the blower motor.
The 1998 Rav 4 blower motor relay switch is located in the engine compartment on the firewall. The blower motor relay switch will be on the passenger side of the firewall.
The resistor is to the left of the blower, it is very hard to get to. You'll have to almost stand on your head to change it.
Blower resistor is under the glove box. It is diamond shaped with 2 screws holding it in.
the resistor is gonna be right off the blower motor attached to the blower motor by a wire harness should be by the heater core
Fig 15 Blower Motor ResistorNOTE: The blower motor resistor is located on the lower right side of the heater housing.REMOVAL# Remove lower right underpanel silencer/duct. # Disconnect wiring connectors on blower motor resistor. # Remove blower motor resistor retaining screws. # Pull blower motor resistor out of heater housing.