2000 Wrangler TJ A/C Blower Issue - Tried everything. Please Help! - JeepForum.com
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post #1 of 11 Old 08-06-2017, 12:59 PM Thread Starter
Wrangler10210
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2000 Wrangler TJ A/C Blower Issue - Tried everything. Please Help!

Hello!

Thank you ahead of time for any help!

So I have the common TJ A/C problem. Blower was working on the third setting for awhile. Now, not at all. Upon reading, reading, and more reading. I tried everything.

Things I have replaced with brand new parts:

Selector switch
Resistor under dash area
Blower Motor
Entire wiring portion (includes new relay)
All fuses

Still not working.

I checked the plug to the blower motor with a test light and when clamped to ground it lights up when connected to power side.

Does anyone have any suggestions on what to do next? It's been a nice hot summer in FL for the past for months. Haha

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post #2 of 11 Old 08-06-2017, 01:16 PM
Rubi4MyMrs
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If you check the ground side at the motor with your test light on the battery (+) you will probably find you have lost the ground to the motor. It is grounded through the speed control circuit.

Here is a link to a troubleshooting procedure & a link with photos showing the usual suspect causing loss of all speeds.

http://www.jeepforum.com/forum/f9/no.../#post28658233

http://www.wranglerforum.com/f210/fa...l#post30987649
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post #3 of 11 Old 08-06-2017, 01:17 PM
btn
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Maybe a bad ground through the blower plug? Do you get current if you jump to the plug ground itself and not a separate ground source?

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post #4 of 11 Old 08-07-2017, 02:04 PM Thread Starter
Wrangler10210
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Hello! Thank you for the info.

So I followed the steps that you linked as best I could.

I found that i'm getting power to the blower just fine and no ground. I took the wire coming off the plug and grounded the black one. (Blower ran)

Upon checking the plug behind the speed selector, I found no sign of melting or burning. The speed selector itself is brand new.

I'm assuming that the dark green wire on the back of the plug is the ground being as when I grounded the test light and touched it to the other parts of the plug it lit up.

When I jumped those other sockets to the green wires socket the light was very very faint.

What should I do next?
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post #5 of 11 Old 08-07-2017, 02:22 PM Thread Starter
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Also, I just checked every other connector around it and the rest of them are grounded fine. Follow the wire down to the larger green connector behind glove box/under dash and found ground was fine there as well. So it really only seems like a bad ground to the selector plug. I just don't know where to locate it. I did find slight melting on the back of the panel though near HVAC mode switch (Pics below). Not sure if maybe that has something to do with it? (Checked 3 wire connector on side and didn't see any melting on it but it looked a little toasty on the side that connected to the actual front panel)
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Last edited by Wrangler10210; 08-07-2017 at 03:12 PM.
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post #6 of 11 Old 08-07-2017, 05:07 PM
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That last photo of the 3 wire connector above sure looks melted & the terminal in the middle looks like it has been hot which is the common problem I noted above & is where you are losing the ground path. That is the dark green wire from the 5 wire speed switch which you noted had a weak showing on your test light which indicates high resistance. That wire connects to the black one when the mode switch is in any position except off. The black is the ground wire. It is all explained in the link I gave. The switch has been hot too (next photo up) so should probably also be replaced.
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post #7 of 11 Old 08-07-2017, 05:42 PM Thread Starter
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Perfect! I ordered the switch and new connector that was melted. The link was very helpful, but I just wanted to clarify. Thank you! Will post result (:
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post #8 of 11 Old 08-07-2017, 07:12 PM
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Your blower motor is possibly tired and drawing too high of current?...
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post #9 of 11 Old 08-08-2017, 08:10 AM
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Quote:
Originally Posted by Knuckelhead View Post
Your blower motor is possibly tired and drawing too high of current?...
He stated that he already replaced the blower motor.


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post #10 of 11 Old 08-08-2017, 07:20 PM
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Oops, missed that...
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post #11 of 11 Old 08-08-2017, 07:36 PM
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Quote:
Originally Posted by Rubi4MyMrs View Post
Make sure there is power to the blower motor, and then everything from there is through the ground side. The ground path is from the blower to the resistor (except high speed which bypasses the resistor), to the speed switch (which directs which path through the resistor), to the mode switch (which closes the ground path in all positions except off which is the only position the blower is off) to ground.

That last photo of the 3 wire connector above sure looks melted & the terminal in the middle looks like it has been hot which is the common problem I noted above & is where you are losing the ground path. That is the dark green wire from the 5 wire speed switch which you noted had a weak showing on your test light which indicates high resistance. That wire connects to the black one when the mode switch is in any position except off. The black is the ground wire. It is all explained in the link I gave. The switch has been hot too (next photo up) so should probably also be replaced.


So it looks like we really have to do the relay mod to avoid frying the speed switch

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