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86-95 Trucks & 4Runners 2nd/3rd gen pickups, and 1st/2nd gen 4Runners with IFS

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Old 01-06-2011, 08:41 AM   #1
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install bypass toggle for blower motor speed control

I have a 90 4runner and recently lost high speed control setting for the heater blower motor. I am wondering if i can simply install a on/off toggle switch to avert this problem?. has anyone done this before?.. it was in the single digits this morning and i would really like to have high speed to help defrost and warm things up inside.
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Old 01-06-2011, 08:42 AM   #2
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the problem is not the switch, it's the blower motor resistor. Hooking a switch up to bypass the dash controls will not work if the resistor is bad.
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Old 01-06-2011, 08:45 AM   #3
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i was under the impression that if it was the resistor that i would Still have the high speed setting. Currently only low and medium is working
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Old 01-06-2011, 08:47 AM   #4
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pull your resistor out and see what it looks like.
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Old 01-06-2011, 08:48 AM   #5
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Should be doable. Odd that it's high that isn't working though, usually it's the resistor that goes out and causes the lower speeds to quit working.

If I were you, I'd pull your fan speed resistor (it's behind the glove box) and spend a little quality time with a test light and multi-meter to figure out where the problem is...might be repairable pretty easy.

Might want to test your fan switch too for that matter.

If you're determined to ghetto it up, there's no reason you couldn't rig up a toggle. I'd just suggest that in the time it takes to do that, you could very likely find and fix the actual problem.

Good luck!
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Old 01-06-2011, 08:50 AM   #6
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heh, beat me to the punch xtreme.
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Old 01-06-2011, 08:54 AM   #7
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it could be the switch as well, but it's more common and easier to pull/test the resistor first then it is to rip those heater controls out of the dash.
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Old 01-06-2011, 08:55 AM   #8
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ok.. i'll check out the resistor, and keep you all posted. im pretty sure its the switch tho. everything ive read so far seems to be that if it were a bad resistor that the lows wouldnt work but the high would.. Ive searched napa for the fan speed switch with no results.
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Old 01-06-2011, 08:57 AM   #9
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Hijack

I've got a frozen fan speed selector. No amount of force is getting that thing to budge from the off setting. I know that my resistor is in various states of failure as I had off, low, and high but no medium high speed. But now the switch has totally locked up. Is there a cable back there? or is it all electrical?
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Old 01-06-2011, 09:03 AM   #10
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fierohink.. i read somewhere that the switch sometimes can melt.. if your switch is set on high while the vehicle is being started that the power being drawn is too high and melts the switch... this might be what happend to me as well. im waiting till the temp outside.. currently about 14 degrees outside, warms up a little before i go out and rip this dash apart.
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Old 01-06-2011, 09:07 AM   #11
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Thats what it feels like. This switch is solid now. There is no wiggle left. So it would make sense if it was fried.
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Old 01-06-2011, 09:30 AM   #12
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I just replaced my heater resistor 5 mins. ago. Now I have all the speed selections. Before I only had high and just before high.
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Old 01-06-2011, 09:43 AM   #13
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I had to replace the resistor AND the switch in the dash on my 91 Pickup, so it really could be either one


the resistor is MUCH easier to get to though, so I'd start with that one, lol
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Old 01-06-2011, 09:51 AM   #14
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fierohink i had the same problem as u and it is the switch, i got mine from a junk yard and all works now, its just melted and needs to be replaced.
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Old 01-06-2011, 10:36 AM   #15
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The switch on mine melted. I was able to remove the glove box and loosen the climate controls, then pull the old switch and snake the new one in without removing more of the dash. Not fun but still doable
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Old 01-06-2011, 02:49 PM   #16
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I was wondering if any one has ever tried a after market variable rheostat ? I had pulled one out of a old truck and it was self contained ,the more you turned the knob the faster it would blow. It worked like a home dimmer switch. It might be a easier cheaper fix if it would work.
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Old 01-06-2011, 02:49 PM
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blower, bypass, control, fan, install, motor, resis, resister, resistor, selector, speed, switch, test, toggle, yotatech

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