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

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Old 12-10-2012, 10:24 AM   #1
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blower motor stopped working???

Hi, My blower motor is not working. I haven't used the truck in two days and now it will not blow anything. It seems like heat is comming out but no fan. A/c button will not light up.

There is something on the passenger side that looks like a blower motor. I pulled the plug and I seem to be getting .10-.40volts wroughly when I move the switch for the different fan speeds. I checked the fuses. I tapped everything.

Any input would be great.
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Old 12-10-2012, 10:32 AM   #2
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Quote:
Originally Posted by chrisorbics View Post
Hi, My blower motor is not working. I haven't used the truck in two days and now it will not blow anything. It seems like heat is comming out but no fan. A/c button will not light up.

There is something on the passenger side that looks like a blower motor. I pulled the plug and I seem to be getting .10-.40volts wroughly when I move the switch for the different fan speeds. I checked the fuses. I tapped everything.

Any input would be great.
You did not state what year-model you have, but if you have 1986-1988 4Runner, circuit is here:
Click the image to open in full size.
When you say check the fuses, did you measure voltages referenced to ground, or merely looked at them? Also take measurements on fuse and relay behind cigarette light socket and to left of glove compartment.

Click the image to open in full size.

Click the image to open in full size.

Last edited by RAD4Runner; 08-02-2013 at 10:21 AM.
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Old 12-10-2012, 11:32 AM   #3
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Can't be much help without more info on what you're driving.

Assuming all of your fuses are good as you've stated, and since you're not getting any fan movement no matter what position the switch is in, my first guess would be the blower motor resistor. It's located inside your dash behind the climate controls. It will look something like this depending on what year you have...

Click the image to open in full size.

We really need more info before we can help much more.
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Old 12-10-2012, 02:04 PM   #4
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Blower Motor Control Module / Resistor

Quote:
Originally Posted by SPARKS89 View Post
... the blower motor resistor. It's located inside your dash behind the climate controls. It will look something like this depending on what year you have...
Click the image to open in full size.
Concur.
Edit:
IF AC works on one (some) fan speed(s) and not the others, one of the resistors could be burnt/open.
(Was: If one of the series resistors on the resistor module is open, AC will not run and indicator lamp will not come on.)

Resistor module will not be obvious. The resistor module is installed into a recess in the firewall, so you will only see the connector (the back of what's in picture ^) where the cable plugs into.
Click the image to open in full size.
Unscrew module from firewall and inspect for melted/broken filament or Measure resistance from one contact to another.
Click the image to open in full size.

On 1986 4Runner each resistor segment measures 0.5 ohm.
Click the image to open in full size.

The resistor module is INexpensive. (Search "Blower Motor Control Module / Resistor" on www.Rockauto.com)

Last edited by RAD4Runner; 12-12-2012 at 09:00 AM. Reason: added mroe details & pics
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Old 12-10-2012, 04:31 PM   #5
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1995 Pickup 4x4 22re 5speed

Last edited by chrisorbics; 12-10-2012 at 08:29 PM.
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Old 12-10-2012, 04:41 PM   #6
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I am going to look for the resistor tomorrow. Thanks for all the information so far.
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Old 12-10-2012, 08:44 PM   #7
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1995 Pickup 4x4 22re 5speed
OK. Concept should be the same. Best to find your truck's schematic, but if you could not, just check that you have all series resistors in good condition with continuity to each connector terminal.
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Old 12-11-2012, 05:29 PM   #8
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Check the fuse first... Resistor would only be my guess if you've only had a couple speeds working to begin with.
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Old 12-12-2012, 08:40 AM   #9
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I guess you are talking about the fuse under the dash.
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Old 12-12-2012, 08:54 AM   #10
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Quote:
Originally Posted by chrisorbics View Post
I guess you are talking about the fuse under the dash.
Yes, Fuse under dash like in above post
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Old 12-12-2012, 10:56 AM   #11
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Found it under the glove box. Looks like .10 volts for the 30a and .11-.12 for the 10a fuse on the 20volt scale. The relay above it clicks but I can only feel and hear it when the shut the fan off. I am testing the resistor module now.
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Old 12-12-2012, 11:08 AM   #12
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I got it out and it is ceramic on the other side. m1-L 3.96 m1-m2 4.10 m2-h 4.10 L-H 4. This is all on the 20m scale. Sorry not very good with electical. This was done with the module out of the truck.
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Old 12-12-2012, 01:53 PM   #13
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Quote:
Originally Posted by chrisorbics View Post
1995 Pickup 4x4 22re 5speed
Quote:
Originally Posted by chrisorbics View Post
I got it out and it is ceramic on the other side. m1-L 3.96 m1-m2 4.10 m2-h 4.10 L-H 4. This is all on the 20m scale. Sorry not very good with electical. This was done with the module out of the truck.
We need someone with second-gen to chime in. Hopefully find a schematic. Figures I have above are for 1st gens.
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Old 12-12-2012, 02:26 PM   #14
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Here's the diagram for a '93. http://personal.utulsa.edu/~nathan-b...g/25heater.pdf Not much different than what RAD4Runner supplied.

As you can see, the 30a fuse only gets voltage when the heater relay is closed. Did you test it with the heater switch "on"? The relay itself is powered through the 10a GAUGE fuse (JB1 by your left ankle). If you can hear the relay click when you move the switch (key-on, of course), but you get less than 12v on EITHER side of the 30a fuse, then the relay is not working. If you can't get the relay to click, and the 10a GAUGE fuse is good, its either the relay or the switch.

It's probably not the the blower resistor; they fail often enough, but "HI" should continue to work. If you've got the resistor out, and you're measuring 3,960,000 ohms (20m is 20 megohms) something is definitely wrong (you can get less than 4 megohms just holding the probes, from the perspiration on your fingers). There's no spec on resistance (the test is just for continuity) as the resistance should be less than 1 ohm (and very few multimeters can measure below 2ohms, because of the resistance in the leads themselves).
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Old 12-12-2012, 02:38 PM   #15
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This may have already been said, but too lazy to read everything.

My truck's A/C & Heater Blower Motor Switch fried itself. Went to turn on the fan and smoke came out of the dash. It then only had two speeds, off and full-blast but if all the circuits fried then it could result in no functionality.

This may be the issue, that was what was wrong on mine. It comes with a little light for the A/C as well as part of the switch unit (which you said is burnt out), so I'm thinking this is most likely your issue if the light doesn't work.

It looks something like this (this photo is a Corolla, but the ones for P/U and 4Runners are almost identical)

Click the image to open in full size.

The bad news is I don't know of a way to check it without tearing the dash off. Mine was noticeably fried: melted plastics with dark burnt plastic where it short-circuited. They cost roughly $60 new so might want to check before you buy one. Or visit the junkyard, just pull your old one first and compare, there are a lot of parts you can take off Camry's and Corolla's that are identical to ones in 4Runners and Pickups. Hope that helps ya.
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Old 12-12-2012, 07:12 PM   #16
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As you can see, the 30a fuse only gets voltage when the heater relay is closed. Did you test it with the heater switch "on"? The relay itself is powered through the 10a GAUGE fuse (JB1 by your left ankle). If you can hear the relay click when you move the switch (key-on, of course), but you get less than 12v on EITHER side of the 30a fuse, then the relay is not working. If you can't get the relay to click, and the 10a GAUGE fuse is good, its either the relay or the switch.
Ok so I should test the 30a fuse with the fan switched on.

I was just driving without the resistor in and if I try to turn the heat on with the a/c button on the a/c light flashes for a second but if you try it again it does not flash unless you wait for a few minutes. Odd
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Old 12-12-2012, 07:16 PM   #17
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I will also test for continuity on the resistor module also. I probably just messed up the reading because I don't know how to properly work a multimeter.
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Old 12-13-2012, 09:05 AM   #18
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http://www.autoshop101.com/forms/h4.pdf
hardly the best introduction to multimeters, but arguably automotive-centric.
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Old 12-28-2012, 11:02 AM   #19
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Ok, finally got time to fix it. I was driving my 1997 4runner. Now it is really cold here. It was the relay. I popped it apart and there was moisture in it which rotten out a connection completely.
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Old 12-28-2012, 01:04 PM   #20
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Ok, finally got time to fix it. I was driving my 1997 4runner. Now it is really cold here. It was the relay. I popped it apart and there was moisture in it which rotten out a connection completely.
Glad you got it to work, chrisorbics, and thanks for the update! It is appreciated when one reports back on what he found out and shares the knowledge with others, instead of simply keeping the info to himself after others had helped him.

Happy New Year,
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Old 12-28-2012, 01:04 PM
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1986, 1995, 2002, 4runner, ac, blow, dont, f150, fan, fuse, heater, not, short, speeds, tundra, turn, work

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