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AC blower motor somtimes not working

GSP7
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GSP7

GSP7

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Posted (edited)

Had this issue before. , So just starting a new thread

 

I have been leaving my AC knob switch on position and my AC blower had been going on all the time when I start the truck

 

Last couple days it sometimes it doesnt go on when I turn the ignition on and drive my truck . But a few miles down the road all the sudden it will go on

 

Sometimes the blower fan will go on in a minute or so and just a mile or so, sometimes I might drive 10-15 miles 20 minute and then the blower fan will all the sudden finally go on

 

This happens no matter what speed the blower motor is set too. So I dont think its that resistor issue

 

I saw this vid but this vid truck is different newer truck. He found a wire harness plug issue. So I not sure if my older 99 is the same or what is wrong

 

Anyone ever had this blower motor rndom not working  issue or know what is wrong  and the fix ?

 

 

 

Edited by GSP7
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GSP7

GSP7

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17 minutes ago, Mopar1973Man said:

Blower resistor is failed You need to replace both the blower motor and the blower resistor as a package. Being the bearings in the blower motor is most likely partially seized up and the blower resistor quit or failing because the extra amperage draw is causing excessive heat on the resistor.

 

I what ive read up and understand is that the resistor issue is for the lower blower speeds and only if the blower motor works on high and the lower speeds dont work

 

Ive heard of guys replacing the resistor and it doesnt fix the issue, nothing wrong with the resistor.

 

Mine works on all speed , and works great even on the lowest speed. But when it wont go on, for a period of time, all speeds dont work. .

Edited by GSP7
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Mopar1973Man

Mopar1973Man

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:doh: 

 

Strange... 3rd Gen body in a 2002... Now I've watch the video. Sorry about that. I was think 2002 2nd Gen body which I've done a bunch. Then my last comments was like the other 2002 3rd Gen here in the valley he smoked the blower motor brushes. Replaced that and problem was gone. 

Edited by Mopar1973Man
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GSP7

GSP7

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I hope that is all it is and not a big diagnostic problem

 

Is the blower motor easy access under the glove box , just up from passenger side floor??

 

Is Rock Auto the best quality less expensive place to get a new blower motor? Or somewhere else?

 

Next time the blower wont go on I think ill tap motor with a stick leaning over from my drivers seat and see if it goes on. ???

 

P.S.

I see rock auto has both the resistor and blower motor . VDO , SKP , Four Seasons, brands

 

$27-39 for the blower motor .

Any recommendations on which brand is best that rock auto offers ?

 

Edited by GSP7
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GSP7

GSP7

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1 hour ago, Dieselfuture said:

I just got blower motor and resistor from Rock Auto, I got the most expensive ones that they offer. Motor came with the cage/blower.  only had it on for few weeks, so far no problems.

 Did you have the exact same issues as me no blower at all, some times,. Or high speed worked but no other blower speeds?

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Rogan

Rogan

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13 hours ago, Mopar1973Man said:

:doh: 

 

Strange... 3rd Gen body in a 2002...

Yeah, I'm sure you know, but the 2002 1/2 tons were new body style (3G).  It always confused me, for the longest time.

I've got a 2001 at the house that needs a resistor and blower right now. 

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GSP7

GSP7

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HEY Diesel future,  Did your new fan motor spin real easy by hand and coast for awhile before it stopped spinning , or was it not free wheeling when you turned it

.

.

 

Welp,,, I pulled my blower motor this morning, after work, Just to check it out.

Its a Denso brand, Had just a couple small leaves and some pine needles in the fan drum.

 

Spinning the fan checking the bearings, it wasnt free wheeling, but some resistance, but not frozen up or real tight

.

I pulled the fan off the motor, cleaned it, blew out where the armature where brushes are with compressed air. Sprayed a little lube penetrating oil on the shaft top bearing.Didnt make it spin any better. Put power to it while it was out and it worked on all speeds

 

Im going to order a new blower motor and replace this one. It looked like the brushes were probably worn out and maybe the bearing are a little tight. Quit a bit of Brush wear dust on the fan drum and motor

 

All my speeds work so I think my resistor is fine. Its either going to be good or bad .

What do you think ? I dont think Ill waste the money replacing the resistor if it isnt bad. Its not a wear part is it?

 

 

Edited by GSP7
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Dieselfuture

Dieselfuture

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Yeah new motor spins easy, my original one was rough time. After some oil it spun easy and I did dump some black dust out of the hole, like you said probably brushes wore some. Resistor is and isn't a wear item in my opinion, if everything works fine it should last a long time but if motor is dragging then it will burn out faster. I would just replace it. Take it out and look at it, mine was missing a few big chunks, I used a vacuum and a rubber heater hose to clean most of crap out of the box along with resistor chunks.

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  • 2 weeks later...
Gregturley

Gregturley

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I have the same problem. No blower on any speed or position. Then it will just start randomly and keep working until I turn the key off. This morning when I got to work I pulled the fuse cover on dash to check for power at the fuse. It was good. What I found was a bad connection on the output side of the fuse. If I push sideways on the fuse the blower will work. Push the other way I can make it stop. Try the wiggle test starting at the fuse and work to the resistor and blower. My truck is an ex fleet truck for where I work. The main reason for it's removal from service was the blower not working. Someone had put a fuse tap on the blower fuse. It looks like that damaged the terminal in the fuse block. I tightened up the terminal end (bent it with a dental pick) and so far it seems to be fixed. Don't overlook the simple things, and never underestimate the damage and problems that a "mechanic" can cause. 

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