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Old 12-18-2013, 06:26 PM   #1
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Heater problems

So I got this 2000 jeep wrangler and I replaced EVERYTHING, the resistor, switch, and blower and it still won't work? Anybody got any ideas?

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Old 12-18-2013, 06:31 PM   #2
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What won't work ?

I am guessing the blower fan never runs

Check fuses first

The try running 12 volts directly to blower motor and see if it runs as if 12 volts won't make it spin you know it is bad

If It does spin normally you know the problem is getting juice to the fan

You get more response to probs on the TJ tech section rather than the TJ general section

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Old 12-18-2013, 06:37 PM   #3
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I checked the fuses and they ain't blown. Another thing is that I had the top down and it rained pretty good and some of the water got in the vents..could that be a problem too?
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Old 12-18-2013, 06:51 PM   #4
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Does the fan spin if you run a good battery ground and a good battery positive to it?

We need to eliminate possible probs not throw new parts at it hoping for a solution or do lot of what ifs so let's start there it costs nothing and narrows it down significantly
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Old 01-18-2014, 12:32 PM   #5
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This is my problem also!!! My blower is good when connected to a battery. Replaced fan switch and resistor also. have heat just no fan. My fuses were all good
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Old 01-18-2014, 03:32 PM   #6
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Ok next test wires connected to the fan turn control to high and put meter on on air that would connect to ground see I'd one is 12 volts and other is a good ground
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Old 01-18-2014, 04:38 PM   #7
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This is a general procedure to troubleshoot the blower circuit. Some of the tests may apply to things you have already done but if you go through them step-by-step you should find the problem.

For '99-'04s:

Make sure the blower motor tests good by putting 12v & a good ground directly to the motor. If good:

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.

After making sure you have 12v to the blower motor & good contact there you have to find where you are losing ground, which with 12v to the motor & a good motor, is what will keep it from running. You can jump the motor to ground to be sure the motor & connector there is good then work down the circuit. But when you lose all speeds the connector at the mode switch or the mode switch itself are the most common places of failure so check the 3 wire connector there for melting & signs of excessive heat then jumping the green & black wires from that 3 wire connector there is a good place to start after verifying that the black wire is grounded. When the mode switch is in any position except off it grounds the dark green wire through the black one. If jumping those wires (key on) gets all speeds & the connector is good the mode switch is bad. If no speeds, move to the speed switch. Check that 5 wire connector as you did for the 3 wire one. If you ground each of the 4 wires not including the dark green one (that goes to the mode switch) you should get each of the 4 speeds as long as the key is on. If yes, the speed switch is bad. If grounding the speed switch wires doesn’t get the blower running, especially high speed, go to the blower motor connector & recheck it carefully. If you do get high but are missing 1 or more of the lower speeds, the resistor is bad.

If you don’t have power to the motor check fuse 8 behind the glove box & fuse 1 in the PDC in front of the battery. For ’99 only check fuse 11, not 1.
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Old 04-10-2014, 11:18 PM   #8
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Detailed step by step of fan blower replacement on 2000 Jeep Wrangler 4.0

I appreciate the knowledge in the previous posts. I was able to do mine in 20 minutes but it was a little different than those listed above. Here is mystep by step instructions

1. Open hood.
2. Disconnect battery cables(tie them so they dont bounce back while you are pulling battery)
3. Remove battery.
4. In the 2000 model there is a rectangular box that covers the blower. This is some sort of supplementary computer and is held on by 3 screws. Remove the 3 screws and take this panel off.
5. Remove the fan blower by unscrewing the 3 8mm bolts that hold the fan blower into the firewall between the glove box and engine compartment. After this you have to really wiggle the connector boot to detach the fan blower from the connecting wires.
6. Look back into the hole where the old blower was and you can see the blower controller resistor in the bottom right. I replaced mine about 2 years ago and this seems to also be a very common part that fails. This is usually the cause when your fan only works on the lowest setting or settings 1 and 4. It is a $15 part so might be a good time to replace it while you got access to it.
7. Take the new blower and push the connector onto it. This is another wiggle job but you will know you got it on when the whole connecting boot slides into the new blower. Then replace the 3 8mm bolts
8. Replace the rectangular supplementary computer panel by screwing its 3 screws in.
9. Replace and hook up the battery and close the hood before checking. If it doesnt work I would look at replacing the blower controller resistor switch mentioned above, the fan switch on the control panel, or the heater/ac selector switch also on the control panel. These parts are also around $15 each on Amazon. I have now replaced all of these in the last 2 years but am very happy with how well my AC works now. Good luck all.
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Old 08-23-2014, 12:07 AM   #9
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Thank you I will look at this

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