there's an 5 amp fuse in the fuse block marked instrument that's blown.
tested blower,ok. then tested incoming voltage to blower and found to be zero. the final step was to replace the blower switch. To replace that switch, the middle part of the dashboard, including the radio had to be removed. The ac and heater come in one piece. It worked fine then. I think, there is a chance that the switch could be just cleaned up and it would work, again I think.
Blinker switch would suggest ignition switch- turn key to on but dont start car and jiggle key with blower turned to 5. Working only on 5 suggest resistors are bad. The resistors are inside the blower case with the actual blower or very close to the blower case outside and you can tell if they are bad(burned, etc). . If 5 is high then 1-4 goes thru resistors but 5 is direct with only a relay. There should be a relay (think it is under the hood in the electrical box) marked high blower or something similar. Pull it out and check condition of prongs and plug it back in and see if it works on 5. There is also the possibility of the speed switch 1-5 being bad or just corroded. Pull the switch and unplug the plug and check it for corrosion. Of course there is another way to see if blower is getting power by checking voltage with ignition switch on and fan switch on 5 but that means you have to remove the trim under the glove box and measuring with a meter. Hope these ideas help.
: My 2002 focus blower fan worked at the highest setting only and not 1,2 and 3. I fixed it by replacing the blue resistor pack held down by 1 screw behind the glove box next to the blower motor. : At first I checked the power supply to the blower motor connector. I was getting power only at setting 4 and none at other settings. : Fan blower electrical diagram showed that the only connection to the fan blower is the power supply, resistor pack and front panel switch.
I did this job on a 1999 Grand Prix, and I believe the location is the same for the 98 year model. First of all you will have to remove the blower motor itself. It is located on the passenger side floor board below the glove compartment, up against the firewall. It is an awkard job and I found that what worked best for me was to lay on my back with my head up against the center console. Once you have removed the 4 screws that mount the blower, disconnect the electrical connection and remove the blower. It is a tight fit around a wiring harness that is in the same area, but with some effort, it will come out. The blower motor resistor is located inside the duct work where the blower motor goes. There are 3 screws holding it in place, one of which is hard to see. A mechanics mirror comes in handy to locate the hidden screw. I would also advise that you replace the blower motor along with the resistor so that you don't have to go through the aggrevation later. I bought both parts through the local Auto Zone, which was much cheaper than the dealers cost. Both worked just fine. Good luck.
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