Mechanics

QUESTION BLOWER MOTOR NOT WORKING

1996 Isuzu Rodeo

Air Conditioning problem
1996 Isuzu Rodeo Question 6 cyl Four Wheel Drive Automatic 115200 miles

My fan blower motor for the a/c and heat is not working on any speed. But when I use the fan speed switch with the a/c button, the compressor does turn on. I have checked the fuses and replaced the motor (i used a test light to check if current was getting the the motor first and it did light up). But it still does not work.

One weird thing I realised today that if may have stopped around the same time my dome light switch started being 'weird'. When the switch is in the position to turn the dome light on when the door is opened, and the door is closed. The light will flash and the horn will beep with the flashing, as well as my turn signals will light up softly with the beeping. That may sound like the car alarm, but the horn beeping is light, and I removed that fuse months prior to this problem.

I was wondering what I have to do to get my blower working. Its been 90 degrees and nearly 100% humidity here and its HOT.

***EDIT***
I just used a test light to check for current. While using the light I grounded it to the frame, and it came on. Then, I grounded it using the blower fan's ground, and the light would not come on.

Could this mean the fan is not properly grounded?

And if this is the problem, could I ground the fan to the frame, instead of through it's normal wiring?
Avatar
Bradyandhisbike
May 23, 2010.



Hi bradyandhisbike,

Thank you for the donation.

Yes, you have a problem with the ground circuit. The fan motor is grounded via the fan control switch at the right kick panel.

At the blower switch, ground the black wire and and if the blower works correctly according to the various speeds, the ground circuit at the right kick panel is bad.

Clean and retighten the ground connection and retest.

KHLow2008
May 25, 2010.
I tried the cleaning and retightening the ground, and it did not work. I think somewhere the ground came off farther up in the car itself.

Could I run a cable from the ground lead to the frame to ground the fan? I tried this temporarily and the fan spun, but I did not want to continously try this, so I disconnected my rigged ground.

Tiny
Bradyandhisbike
May 25, 2010.
Seems you have a broken wire between the fan switch and ground.

You can use an additional ground from the fan switch black wire terminal and is ok to do so.

KHLow2008
May 25, 2010.
Okay, thank you very much. Ill do that for a temporary fix until I can get my car out to someone I know who can get in and fix it.

Tiny
Bradyandhisbike
May 25, 2010.
You're welcome and thank you for using 2carpros.

Have a nice day

KHLow2008
May 25, 2010.
Okay, I grounded the fan. The good news is it turns on. The bad news is it is always on high, even when the switch for the fan speed is off. Would this be a problem with the resistors?

Tiny
Bradyandhisbike
May 25, 2010.
I believe you have grounded the circuit wrongly. The ground must be after the switch and not before. If it is before the switch, the fan would turn on once the ignition key is turned on.

KHLow2008
May 25, 2010.
I think I know what your saying. Ill just use this " always on" as a temporary fix, since it is summer and hot. Im working on getting my car into a guy I know to fix some oil leaks, and ill have him fix this problem, too.

My dad's car did something similar, but it was the resistors. Only high and off worked.

Thank you very much, that should be the last question I have concerning this problem.

Tiny
Bradyandhisbike
May 25, 2010.
Usually a faulty resistor would have the highest speed running as it is a direct link whereas the other speeds have to go through resistors to reduce the amount of current going through and these resistors tends to fail over time.

If you are able to get to the switch, you can wire the Black ( ground wire) and ground it to get the various speeds going.

If you wish to continue, just post reply to this post and I will get back to you once I am online.

Thank you for using 2carpros and have a nice day.

KHLow2008
May 26, 2010.
It wouldnt let me send you a private message, since i do no thave 10 posts. But if you have time i was wondering if you could look at my other question since you were such a big help before. It is a non-donation question thought.

here is the link

http://www.2carpros.com/forum/1996-isuzu-rodeo-question-front-shock-absorbers-vt464730.html?highlight=

thanks!

Tiny
Bradyandhisbike
May 30, 2010.
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