blower motor does not work on high level

[bigbluetoy]

hey guys,

my blower fan does not operate at high speed. speeds 1, 2 and 3 work fine, but the 4th highest barely blows anything.

i've been searching the archives, and it seems that if you lose the lower speeds that the blower resistor needs to be replaced. Could this be my problem also? Or could it be the blower relay or maybe even the blower motor? I wouldnt think its the actually blower motor since the other speeds seem to work fine.

I'll probably replace the resistor and clean the blower assembly.

Any other adivce? summer is right around the corner so i would like to get the AC working on high again.

Thanks guys!

 

[coleman0226]

hey i had a similar problem with a 60 ac blowing to. It would not blow in the middle setting. The brushes in the motor were worn out. I had them replaced and the guy that fixed it said that it was ready to go another 100,000 miles. So you may want to check the blower motor brushes.

 

[dmede808]

Typically you lose the lower speeds on your blower reisitor, becuase they get usede the most. But Iguess you could jsut as easily have worn out your high speed reisitor coil. It an easy part to replace. Check Crusierpaerts.net for the reisitor. Its housed in the air duct just above your gas pedal. If one of the resistor coils is busted you know thats it.

 

[bigbrown]

i was having issues trying to replace the brushes in my blower motor, so i just bought a new motor from nappa for something like a hundred bucks. works great, blows strong and quiet.

the brushes in mine were worn down to slivers.

 

[bigbluetoy]

its just strange cause the 3 lower speeds seem to work fine. im gonna check the resistor after work and see if they are blown. i would think the motor was still good if levels 1, 2, and 3 worked ok. but then again, i dont really know what the heck im doing.......

 

[84CRUISER]

Usually You Lose Lower Speeds With A Resistor, But It Is Possible To Lose High, I Would Look Into The Switch.

 

[LandCruiserPhil]

Over the years I have lost high speed 2 times due to a bad resistor.

 

[Cruzerman]

When I first got my 60, I seem to remember mine had the same problem. If memory serves me (which it is doing less and less these days), there was a wire that had come off on the back of the dash control. I re-soldered it back on and I now had high speed.

 

[bigbluetoy]

its strange, the high speed still blows a little air. maybe less than the lowest setting. im hoping the new resistor solves all problems

 

[dmede808]

its strange, the high speed still blows a little air. maybe less than the lowest setting. im hoping the new resistor solves all problems

That sounds like a bad connection. Check your connections between the switch and regulator. If the high speed resistor coil breaks there should be no fan on hi as opposed to weak fan on hi (I think).

 

[fowldarr]

Mine does the same thing, I think you're looking for a short, Mine works fine 1,2,3 but not on 4, but if I play with the switch it works. To me that indicates a short (at least for me) but haven't torn apart my dash yet to find out.

 

[Buffalo]

I have just replaced my fan resistor to get #1 speed back again. AFAICR the resistor unit had only three coils and i was told that speed #4 did not use any resistor at all; i.e. #1 = all coils, slowest; #2 = two coils, faster; #3 = one coil, faster; #4 no coils - motor running at brush speed, fastest.

Using this theory if you #4 speed is knackered then it is probably a loose connection on the back of the switch or something..!?

~PHIL

 

[bigbluetoy]

I tried replacing the resistor, didnt fix the problem. I still dont have #4 high speed. guess ill have to tear apart the dash to check for a loose wire behind the switch. it seems like it might be difficult getting to the back of the swtich.....

 

[sandcruiser]

Can anyone comment on how long the minimum length is on the brushes?
I've got about 1/4" or so left, which seems like it might not be enough... but finding new ones is a hassle so I don't mind ruling that out

 

[sandcruiser]

After looking around a little, it seems that a "full size" new brush should be around 1/2 inch in length.

Based on that- I went out and got some brushes that are spec'd for a grinder or saw (based on the box). They measure 1/4" by just a shade less than 1/4" by 1/2".

The real trick is that on the generic brushes, the copper wiring attaches at the butt end instead of 90* from the butt. Put differently, on the old brushes the wire came out the "top" of the brush vs. the new one comes out the "end".

Anyhow, with a little Macgyvering it all fit together. Using a flat file I made the brushes a little thinner, to fit into the holder. Then I soldered the wires onto the old wires (new wires too short) to connect to the plastic socket. Then I crammed the brushes into the holder.... bad fit.

I used a dremel to extend the slot in the holder so that the wire could come out more easily.

Sorry no photo, it would save many words.

In the end, it worked ok. The fan spins great now, but is a little whining. I suppose that as the brushes get broken in to match the curve of the motor that it should be a little less noisy. I hope.

The brushes cost about $5 for the pair.

(there is another thread running on this: https://forum.ih8mud.com/showthread.php?t=91456 )

 

[ssgoods]

switch

My first though was the switch. Maybe just pray some electrical cleaner in the switch, maybe a loose wire?

 

[Bako]

Sorry, quite a old dead thread.
I have the same unsolved problem on 07 105 series without auto clima.
1, 2, 3 speeds work well, High setting does not. High setting blows with some negligable power, almost nothing, less then 1st setting.
Please help identify issue, i see 2 members had the same problem, hope u solved themi was not able to locate blowwr control relay behing ECU, above blower unit.

 

[cps432]

Sorry, quite a old dead thread.
I have the same unsolved problem on 07 105 series without auto clima.
1, 2, 3 speeds work well, High setting does not. High setting blows with some negligable power, almost nothing, less then 1st setting.
Please help identify issue, i see 2 members had the same problem, hope u solved themi was not able to locate blowwr control relay behing ECU, above blower unit.

I just had a similar issue with my 87 60 series. Suddenly one day the blower got weak. Then it seized up on the high speed. I was able to bump the motor and get it working again. Within days the other speed settings slowed down significantly until none worked at all. It was the blower motor that was the real culprit but I changed the resistor as well. I’m glad I did because when I pulled the old one it looked kinda toasty. It works better than it did when I first bought the truck years ago now. It wouldnt hurt to change the motor and resistor. I don’t know anything about the 105s but you might search the 100 series threads.

 

[Bako]

In my case that was:
Connector to relay actually coroded, overheated, also overheated relay pin itself, overheated relay pin metled the relay blastic box and misplaced internal contacts.
So relay was actuating, was cloaing cirquit, but area of contact of internal staff was negligable.
Thats why power was low.