That only the high speed has failed could be/is probably caused by a bad fan switch.
I had a similar issue. First only high would work, blower motor resistor resolved that. Then the third speed would not work, fan switch resolved that and now all speeds. Work. ~30 dollar part and easy change.
Thanks, I have to pull the dash anyhow to upgrade the radio, might as well replace the HVAC switch. Any parts source better than the other for the early style switch? Any other things that I should look at when the center console is open?
The sliding HVAC control isn't the part that controls the fan speed. It's the rotary fan speed switch that I suspect is the cause of the high speed fan setting not working.
Before assuming the worst.... The problem may only be dirty contacts inside the switch.
Go to Walmart or AP store and purchase some Electronic Contact Cleaner (Plastic Safe).
Disassemble the bezel face, remove the A/C controls and disconnect the wires from the fan speed switch. With power disconnected from the switch spray the cleaner into the switch and rotate the switch back and forth from low speed to high speed several times and then allow to sit for 5 minutes OR blow compressed air into the switch so the cleaner fully evaporates. Reconnect the wiring to the switch and test the fan speed switch.
Go to Walmart or AP store and purchase some Electronic Contact Cleaner (Plastic Safe).
Disassemble the bezel face, remove the A/C controls and disconnect the wires from the fan speed switch. With power disconnected from the switch spray the cleaner into the switch and rotate the switch back and forth from low speed to high speed several times and then allow to sit for 5 minutes OR blow compressed air into the switch so the cleaner fully evaporates. Reconnect the wiring to the switch and test the fan speed switch.
RFAASRMA
TJ Enthusiast
Similar line of thinking here but check the wire running to the blower fuse and make sure it isn’t corroded.
If that was the case it wouldn't work on the slower speeds either.
Just the opposite. The resistor pack is only in the circuit for the 3 lowest speeds. The resistor pack is completely bypassed for the highest fan speed.
RFAASRMA
TJ Enthusiast
I understood the high speed blower on 97’s to be on its own fuse with the 3 lower speeds going through the resistor on a separate fuse behind the glovebox. I could be wrong though.
Edit: I was wrong I didn’t specify the high speed blower fuse under the hood.
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Just do some electrical troubleshooting with a multi-meter testing for where the voltage stops and you will determine why the high speed does not work instead of all this supposition...
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Tray Burge
TJ Addict
Tray Burge
TJ Addict
Oh shit! Been there, done that. Arlington, TX is my birthplace.
Nice thing about Texas is there's usually a breeze blowing, in the summer a nice hot, scorching breeze around the clock!
That's why I love GA so much.
Hope you get it fixed.
Well, for the next 2 years, its the teens daily driver, Worse comes to worse, I have a Bikini top for it, she can deal with the heat.
But next weekend or so I am putting in a double din radio in and have the switch on order, will start there try and figure it out when the whole console is out.