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Topic Review (Newest First)
09-04-2012 08:13 AM
shellant I'm not sure if this is the correct way to send you to another post within the forum but if you follow this link it will take you to a thread by member "RUBICON". I will also PM you in case
Cheers
Tony

2000 Jeep Wrangler TJ 3 Wire Blower Harness - Jeep Wrangler Forum
09-03-2012 08:25 AM
fan of fanboys @shellant, and anyone else,

Rubi 4 my mrs is also helping me with a similar issue. Based on this I am sure he is once again correct. My question is how did you fix or replace that?
08-26-2012 09:14 PM
shellant Bingo RUBI 4 MY MRS "You have a grounding problem. The place you missed is the mode switch."
You hit the nail on the head.. I had checked the back of the panel for loose wires and / or burned wires and until I checked it for the 4th time didn't see that the mode switch connection was actually burned out on the inside. It appeared secure and in tact until I really looked at it.
Thank you for your help.
I am still a bit confused that I was getting a voltage reading but for now it works and works properly so I will post that question in in an electrical post.
Again thanks everyone
Tony
08-25-2012 02:18 PM
shellant Thank you so much for sticking with me....
You asked."What do you mean by fan switch in the off position?" What I should have written is "Ignition back on and switch in position 1-2-3 & 4 the fan ran at what would appear to be full speed and would stop when the ignition was in the off position."
Remember that I connected only the positive wire to the back of the fan and I grounded the available fan contact
for the above test.
But you have given me much food for thought so I will get to the car in the next hour or so and go through your suggestions. Hopefully I can come back with good news..
Again thank you for sticking with me.
Tony
08-25-2012 12:18 PM
RUBI 4 MY MRS It seems that you have tested everything correctly but the fact that the fan is not running says something is not right (obviously). Usually something in the explanation is missed or incorrect. I thought maybe the meter was actually between the 12v wire & some other point in the circuit rather than the ground wire at the motor when you got the voltage readings or some such configuration. When you tested it with the motor grounded directly & got only high speed further indicated loss of ground path & since the previous test indicated the speed switch is working (change in voltage) that indicated to me that the mode switch (or connection) was the probable cause. A lot of guys don’t know the mode switch function in the circuit so I thought you should check that as I described above.

Another question I have is you said, "Ignition back on and switch in position 1-2-3 & 4 the fan ran at what would appear to be full speed and would stop when the fan switch was in the off position."

What do you mean by fan switch in the off position? Do you mean the mode switch in the off position? If you had the motor grounded directly to ground there should be no stopping the motor except to turn the key off.

To verify the ground path is good you could use the meter to check continuity from the motor ground connection to ground with the mode switch “on” & at the various speed settings. If that is good & you have power to the motor which you do, that only really leaves a bad connection possibly in the motor itself. When you test with the meter you are possibly moving the wires around enough to make &/or lose connection at a bad connector connection. The connector can look good but have a loose fitting terminal within the connector. Usually that will show as a dark or burnt look on the terminal itself. You can try connecting everything then grounding the circuit with a jumper to various points in the ground path & see if the motor starts running at some point. Sort of what Riptide did. Also try wiggling the connections a bit including the connections at the motor.
08-25-2012 08:31 AM
Riptide63 I believe RUBI 4 MY MRS is on to your problem. I had the same thing happen on my previous 2000 TJ. The mode switch & connector were burning-up. Unfortunately, NOBODY sells a new connector and the dealer wants to sell you the whole wiring harness. After finding nothing in the aftermarket and the local bone yards, I installed a permanent jumper between the two larger wires a couple of inches back from the connector, leaving the wiring to the switch intact. This allowed the heavy current of the blower motor to bypass the switch, keeping the heat out of the switch while allowing the switch to still control the A/C request signal. The only abnormal effect was I couldn't turn the blower completely off. In other words: the blower will run at whatever speed the fan switch is set to as long as the ignition is on. This didn't bother me in the least. I drove that Jeep for another 2 years and had zero issues with the blower motor from that point on.
08-25-2012 07:08 AM
shellant Thank you every one for your suggestions and I am trying evrything and anything that you might come up with.
I will pull the panel today and inspect the back of the Mode switch just in case I did miss some melted wires or bad contact.
Again , what really confuses me is that it seems like I have a good ground when I put the meter across the fan connector wires.
I get 12volts when the switch is in the high position and lower voltage readindgs as I switch the fan down through 3-2-1-positions.
Doesn't that tell me that the circuit is good and the resistor is good?????
Isn't the multi meter reading essentially the same as having the fan plugged to the circuit.So if the meter reads the voltage is that the same as saying that voltage would be getting to the fan if It were plugged in instead of the meter????
I would normally think that what I have checked so far would indicate a bad fan but when I wire the fan directly to a 12 volt powere source , the fan runs like a dream??
Here is a quote from my original post :
"I assumed that maybe the connector was bad so I cut the connector and wired two spade connectors to the ends and rechecked voltage and again 12 volts . I plugged them into the back of the fan and again the fan did not run.
Next , Ignition off. I put the continuity meter across the two wires to determine which was ground . I then conected only the positive wire to the back of the fan and I grounded the availible fan contact.
Ignition back on and switch in position 1-2-3 & 4 the fan ran at what would appear to be full speed and would stop when the fan switch was in the off position
."

Wattapunk: I think that was the point you were making but I think that I have determined that the resistor is good by getting the varied readings at the different fan speed positions on the switch.
Again gang,
I will try any suggestions
Cheers
Tony
08-24-2012 11:26 PM
Wattapunk I believe the voltage drop through different speeds are normal because the lower speeds are controlled through the resistor while the highest setting is straight 12v. That's why if the resistor is bad, only the high setting works. I think you have already done this but cut and connect the blower ground wire from the conector straight to a good ground on the firewall. See if the blower will work this way.
08-24-2012 09:41 PM
shellant OK. I am obviously not an auto electrician but I do have a question.
If I put a multi meter across the two fan contacts I get 12 volts when I swicth the fan to high (4) and smaller voltages as I turn the fan speed switch 3-2-1. Again I am sorry that I did not record the lower voltage readings but they were definately down coincidently with the switch .
My ignorance about to be displayed here....
If I get a voltage reading , does that not tell me the circuit is grounded. In my mind if I get a reading is that not enough to indictae that it was grounded.
Sorry , but I am stumped.
Cheers
Tony
08-24-2012 01:38 PM
RUBI 4 MY MRS You have a grounding problem. The place you missed is the mode switch. After the speed switch the (ground) circuit goes to the mode switch. When the mode switch is in the off position the ground from the motor/speed switch is open to turn the fan off. When the mode switch is in any other position the ground path should close to let the fan run at whatever speed the speed switch is set to. Check the 3 wire connector at the mode switch then the continuity between the terminals for dark green & black wires with the mode switch in any position except off. You can also ground the dark green wire (key on) to see that all fan speeds work.


See the diagram in the online read only FSM here:


Jeep Knowledge Base
08-24-2012 01:01 PM
Wattapunk Looks like you replaced everything except the motor. It looks like you have a bad ground at the blower motor connector. I would still pull the air control panel and inspect all wiring for bad/dirty contacts and melting, especially where the fan control switch is. Try tracing the connector wiring back to the resisitor and relays for any melted wires. Any fan motor related wires tend to heat/melt,especially if your fan motor is drawing too much current due to debri, worn bearings, etc...
08-24-2012 09:22 AM
shellant
Blower motor still no work

Hi All and thank you for having me.
I have a 2000 wrangler and the blower motor stopped working.
so far this is what I have done.

1:confirmed fuses are good both under hood and behind glovebox
2: replaced switch
3: replaced Resistor
4:replaced Relay

Plugged wires into back of fan and nothing. Nothing at any speed.
I have removed fan from car and direct wired to battery and fan works fine.
I put a multi meter across the connector that plugs into the back of the blower fan and with ignition on was getting a good 12 volts at the high switch position (4) when I reduced the switch position 3-2-1 it altered my reading at each increment but I did not take notes of the exact figures while doing so. ( balancing act )
I assumed that maybe the connector was bad so I cut the connector and wired two spade connectors to the ends and rechecked voltage and again 12 volts . I plugged them into the back of the fan and again the fan did not run.
Next , Ignition off. I put the continuity meter across the two wires to determine which was ground . I then conected only the positive wire to the back of the fan and I grounded the availible fan contact.
Ignition back on and switch in position 1-2-3 & 4 the fan ran at what would appear to be full speed and would stop when the fan switch was in the off position.
Sorry for the length of this post but I wanted to give you as much info as I could. Any tips would be fatastic
Thank you in advance
Tony

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