Blower only on low speed
May 12, 2020 | 11:14 AM
#1
Thread Starter
Registered User
Joined: Oct 2018
Posts: 611
Likes: 118
Blower only on low speed
86/8 Runner
Resistor is fine. Tested three. Work in another runner.
Switched relays with other truck.
Switched blower motor.
First click of switch does nothing, relay clicks, 3 and full same speed.
Opened switch (brown pcb board looking thing, not black all over. Exposed solder contacts on cover/pcb with transparent plastic sheet cover.)
Cleaned contacts, tested with screwdriver by shorting each of the three resistances. All clicked the relay. Weird.
I've pulled all plugs and relay so many times there can't be any carbon. Switch works the resistor, albeit not on click one.
It's stumping me.
Here's a short vid showing relay noise and symptoms. I wrongly state that it should be running with the resistors connection off.
And I found the relay, it's the buzz.
Sorry for swearing at the end of the vid.
https://youtu.be/ByaSd5lACsghttps://youtu.be/ByaSd5lACsg
Resistor is fine. Tested three. Work in another runner.
Switched relays with other truck.
Switched blower motor.
First click of switch does nothing, relay clicks, 3 and full same speed.
Opened switch (brown pcb board looking thing, not black all over. Exposed solder contacts on cover/pcb with transparent plastic sheet cover.)
Cleaned contacts, tested with screwdriver by shorting each of the three resistances. All clicked the relay. Weird.
I've pulled all plugs and relay so many times there can't be any carbon. Switch works the resistor, albeit not on click one.
It's stumping me.
Here's a short vid showing relay noise and symptoms. I wrongly state that it should be running with the resistors connection off.
And I found the relay, it's the buzz.
Sorry for swearing at the end of the vid.
https://youtu.be/ByaSd5lACsghttps://youtu.be/ByaSd5lACsg
Last edited by ev13wt; May 13, 2020 at 06:37 AM.
May 12, 2020 | 12:29 PM
#2
Registered User
Joined: Sep 2007
Posts: 8,380
Likes: 871
From: San Francisco East Bay
I'm having a bit of trouble following your description (and I did watch the video).
If I have it right, when the blower switch is on off, the fan does not run. When the switch is on I, II, III, and HI the fan runs, but always at the same speed.
Since the fan runs, your relay is fine. Since the fan runs in all four positions, the first half of the switch is fine (that part closes the relay). You believe the resistor is fine, not because you tested it, but by swapping it into another vehicle.
That leaves the switch. Looking for "black" doesn't really help, unless you can see the electrons. On the two lines to the resistor (could be L-Y and L-R) and the line direct to the blower (L-B) you should get continuity to ground (W-B) when the switch is in that position, but not otherwise. (the relay is probably Y-R; these colors come from a '94 EWD.) "Continuity" means you're using your multimeter.
Good luck!
If I have it right, when the blower switch is on off, the fan does not run. When the switch is on I, II, III, and HI the fan runs, but always at the same speed.
Since the fan runs, your relay is fine. Since the fan runs in all four positions, the first half of the switch is fine (that part closes the relay). You believe the resistor is fine, not because you tested it, but by swapping it into another vehicle.
That leaves the switch. Looking for "black" doesn't really help, unless you can see the electrons. On the two lines to the resistor (could be L-Y and L-R) and the line direct to the blower (L-B) you should get continuity to ground (W-B) when the switch is in that position, but not otherwise. (the relay is probably Y-R; these colors come from a '94 EWD.) "Continuity" means you're using your multimeter.
Good luck!
May 12, 2020 | 01:09 PM
#3
Thread Starter
Registered User
Joined: Oct 2018
Posts: 611
Likes: 118
I'm having a bit of trouble following your description (and I did watch the video).
If I have it right, when the blower switch is on off, the fan does not run. When the switch is on I, II, III, and HI the fan runs, but always at the same speed.
Since the fan runs, your relay is fine. Since the fan runs in all four positions, the first half of the switch is fine (that part closes the relay). You believe the resistor is fine, not because you tested it, but by swapping it into another vehicle.
That leaves the switch. Looking for "black" doesn't really help, unless you can see the electrons. On the two lines to the resistor (could be L-Y and L-R) and the line direct to the blower (L-B) you should get continuity to ground (W-B) when the switch is in that position, but not otherwise. (the relay is probably Y-R; these colors come from a '94 EWD.) "Continuity" means you're using your multimeter.
Good luck!
If I have it right, when the blower switch is on off, the fan does not run. When the switch is on I, II, III, and HI the fan runs, but always at the same speed.
Since the fan runs, your relay is fine. Since the fan runs in all four positions, the first half of the switch is fine (that part closes the relay). You believe the resistor is fine, not because you tested it, but by swapping it into another vehicle.
That leaves the switch. Looking for "black" doesn't really help, unless you can see the electrons. On the two lines to the resistor (could be L-Y and L-R) and the line direct to the blower (L-B) you should get continuity to ground (W-B) when the switch is in that position, but not otherwise. (the relay is probably Y-R; these colors come from a '94 EWD.) "Continuity" means you're using your multimeter.
Good luck!
I will take apart the switch again and simply take sandpaper and a multimeter to it.I'll take a vid.
It's got to be the switch or it's plug. All threads I'm finding have a much different looking switch assembly.
I'll test the resistor as well.
Last edited by ev13wt; May 12, 2020 at 01:56 PM.
Thread
Thread Starter
Forum
Replies
Last Post
crafthorse
86-95 Trucks & 4Runners
7
Nov 16, 2009 11:42 AM
