The fuse will be marked "htr A/C".It might be on the very top row of 2 fuses or it might be in the center next to "B/U horn". There is also a resistor on the heaterbox beside the heater motor that goes bad quite often. It could also be a worn out fan switch inside the car. I would replace the resisitor first.
SOURCE: 1990 olds 98 blower motor
I would start at the fuse. Does the blower motor turn off when the fuse is pulled? A relay is usually used in this circuit and can sometimes "stick" allowing the blower motor to receive constant power. A quick check to see if it is a wiring problem, switch or the relay its self would be to find the blower fan relay and see if there is another one of the value you can swap with it. If the problem goes away, chances are it is the relay but I always like to take a volt/ amp reading to double check my work.
Dan
SOURCE: The heater / ac blower
It is the blower resister. I purchasted one at auto zone for $18.00. It is located under the passenger side dash. You need to remove the glove box and the plastic cover under the dash to expose the blower motor. the blower motor resister is right next to the motor. Simply unplug the resister remove the two screws and replace. I did this and now my fan works on all speeds.
SOURCE: Heater blower will not come on
The Oldsmobile and other makes with electronic control board's are plagued with problems. Call your local auto recyclers and get a replacement switch. As far as changing the switch once out of the dash it is just a matter of disconnecting it and hooking up the new one, fairly straight forward . You may need a torques screwdriver to remove it from the dash. Mike
SOURCE: 1998 olds 88 heater blower motor
to answer your question , yes there is a relay ,, it is located on the center rear of the engine compartment , just below the maxi fuse block , you should see a few relays all screwed on a block together . according to picture its the one closest to the passenger side of the car , but i wouldn't count on that . this may help indentify it , it has 4 wires , 1 is yellow ,1 is tan , 1 is light blue and 1 is dark blue . just answering your question . hope ya FIX it . please vote fix ya if you find my info to your liking , thanks .
SOURCE: Blower Motor on a '98 Olds Intrigue
THe blower motor is under the dash. You will have to take out the glovebox and half of the dash to get up in there, but if you have the time and the energy you can fix yourself. Will have to disconnect heater core hoses under the hood
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