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Old 02-17-2014, 05:13 PM   #1
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Post Blower Motor issues

Okay Gentlemen I have a weird one here...

I have no AC or Heat blowing out of my vents. This is how I trouble shot it...

1st- test all fuses (all good)
2nd- see if the blower motor resistor is bad (looked bad so I replaced it)
3rd- new resistor did not help so see if blower motor is bad (took it out and brought it to a electrician and it works fine)
4th- test all connection (resistor connecter and blower motor connecter all works (current tester)

I did not see if it could have been the fan speed knobs themselves...Any help with this issue would be awesome!!! Thanks in advance

Rock on Jeep on!

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Old 02-17-2014, 05:16 PM   #2
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What year ? Is your airbag light on ?

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Old 02-17-2014, 05:23 PM   #3
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2001 yes it is.
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Old 02-17-2014, 05:28 PM   #4
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Try this , their is a connector in the drivers kick panel area above where your foot would rest while cruising. With the key on and blower on wiggle it see if it changes
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Old 02-17-2014, 05:31 PM   #5
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Okay. I will have to give that a try. Give a hour or two and I'll post my troubleshoot.
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Old 02-17-2014, 05:58 PM   #6
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First thing, unplug the blower motor and with the ignition on, check for 12 volts on the dark green wire that plugs into the blower motor and a good ground. If you have power there, plug the blower motor back in and continue. Get a test lead with a couple of alligator clips. Clip one end to a good clean ground point. Use a small nail or similar and clip the other end to it. Access the back of your heater controls. Ground the Brown/tan wire in the 5 wire connector. With the ignition on, the motor should run on high speed. If it does, remove the jumper from there and ground the dark green wire in the same connector and turn the speed switch to any speed. If it worked on the first test, but not on the second, replace the speed switch.

If it worked both ways, it's most likely the mode switch or a bad ground. Use your jumper wire and ground the black wire in the 2 wire connector. If that makes it work, you have a bad ground, if it does not work, replace the mode switch.
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Old 02-17-2014, 08:02 PM   #7
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The old blower motors have the ground and green wires. 1999-present blower motors have clip in connectors. Can I still do this process even with a plug in type connector? I tried the wiggle test. Nothing happened. Just a bunch of wires under there. I will try replacing the speed switch. I can hear the mode switch cut on/ off.
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Old 02-17-2014, 08:42 PM   #8
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Originally Posted by HummerSlayer View Post
The old blower motors have the ground and green wires. 1999-present blower motors have clip in connectors. Can I still do this process even with a plug in type connector? I tried the wiggle test. Nothing happened. Just a bunch of wires under there. I will try replacing the speed switch. I can hear the mode switch cut on/ off.
The colors I gave you are for your year. (Actually 2000) Yes you can do it. You can either probe the wire, or probe the back of the connector, or disconnect the connector to access the terminal inside. Power is fed from the relay to the blower motor, through the resistor (except high speed is direct), then through the speed switch, then through the mode switch, and to ground. So everything past the motor goes to ground. The switches simply complete the circuit to ground.

You should be able to access the connectors if you take out the glove box. The switch module unscrews once the center bezel is removed.
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Old 02-18-2014, 05:15 PM   #9
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Alright Water Dog, Hows this one for you:
2001 Jeep Wrangler.
I had no lower 3 blower modes for a while, then lost the high. Swapped the resistor pack.
2 days later, lost all 4 speeds.
Swapped the switch.
1-2 days later, lost all 4 speeds again
Ohmed the switch, good to go, swapped the blower.
No go on the 1st try, Double checked the switch, it was still good, tried it again, good to go.
2ish days later, No blower in any speed.

Possibly related, possibly not;
This time, no blower, no radio.

Does the blower motor and the radio share a ground? If so, Where?

Lost in 8 inches of snow in New Hampshire!!! Any help is good. Thanks in advance!
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Old 02-18-2014, 05:55 PM   #10
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Alright Water Dog, Hows this one for you:
2001 Jeep Wrangler.
I had no lower 3 blower modes for a while, then lost the high. Swapped the resistor pack.
2 days later, lost all 4 speeds.
Swapped the switch.
1-2 days later, lost all 4 speeds again
Ohmed the switch, good to go, swapped the blower.
No go on the 1st try, Double checked the switch, it was still good, tried it again, good to go.
2ish days later, No blower in any speed.

Possibly related, possibly not;
This time, no blower, no radio.

Does the blower motor and the radio share a ground? If so, Where?

Lost in 8 inches of snow in New Hampshire!!! Any help is good. Thanks in advance!
I don't have access to a 2001 FSM, but I believe the 2000 is the same in this case. The heater switches are grounded at G202 which is just below the right dash speaker. Just pull the two screws on the end of the dash and the speaker grill pulls straight back out of its clips. Pull the foam speaker baffle off, and the ground point is right below the speaker. Your issue does sound like it might be a bad connection at the ground point, but it also could be a bad connection at the motor, or a relay that's only working part time. The FSM only shows the radio case grounded in its mounting, but I've read other post about radios being grounded elsewhere..so I'm up in the air on that one.
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Old 02-18-2014, 06:05 PM   #11
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You are most likely checking the wrong switch when you lose all speeds. Go to the 3 wire connector on the back of the mode switch. Check it for signs of excessive heat &/or melting connector. Make sure the bottom black wire is grounded as Water Dog says. If good then jump between the middle dark green & bottom black wires & see if you get all 4 speeds. That connection makes the final ground path when the mode switch is on. When you are testing the speed switch you may be moving the mode switch wires enough to temporarily get the ground connection back.

Here is a link to a complete test procedure for you Blower circuit.

Heater problems
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Old 02-18-2014, 06:16 PM   #12
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When I was checking the switch, I was ohming through the switch, not the wiring.

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