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Old 06-22-2009, 06:26 PM   #1
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Blower Motor HELP!

My blower motor on my 97 4.0L works on the first 3 settings but not on the 4th. I have tried 2 new relays and both of the new ones as well as the old one click when I turn the switch to the 4th setting. Any ideas on what is wrong?

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Old 06-22-2009, 06:40 PM   #2
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Normally it's the other way around, that when only the highest speed setting works it normally points to a bad resistor pack. Since it's only the highest speed that doesn't work, I'd guess either the fan switch itself is bad or perhaps the wiring harness has been fried as is very common.

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Old 06-22-2009, 06:51 PM   #3
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The thing that has me puzzled is that the relay will click like it is engaging when I turn it to the fourth setting but it still doesn't run the fan. Where does it usually melt the harness? I had to replace the resistor pack because I have a new wiring harness from the relay to the motor and I was trying it to make sure it didn't heat the wires and the resistor went bad. The one in there was going bad for a while because it got hot from poor contact and melted the plug some where it goes to the resistor. I have not pulled the switch out yet.
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Old 06-22-2009, 08:17 PM   #4
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I actually have the same exact problem so any help would be greatly appreciated....sometimes if I give the dash a little love tap it will come on for a few minutes but then shut back down. It works on the first three settings like you said though
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Old 06-22-2009, 08:21 PM   #5
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jerry is right, it is USUALLY only hi working, but i've seen many resistors go bad leaving other speeds or combos working or not. the resistor isn't bypassed necesarily for the hi speed, the power and ground still go through it, so it still could be the resistor which is the most common failure.
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Old 06-22-2009, 08:31 PM   #6
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As Jerry suggested...The switch itself is most likely the culprit. Pull the control panel off to check the back of the switch. The terminals on the back of the switch commonly melt due to the voltage sent to the switch. The wire will probally be melted also.

To remove the controls for inspection of the switch....

1. remove the ash tray....there is a philips screw behind it....remove the screw.
2. remove the defrost vent cover.."goes across the top of the dash" Pops straight up. To remove the cover use a flathead screwdriver to pry it up. It will pop right off.
3. You will see two philips screws holding the top of the center dash bezel after you remove the defrost vent cover ...remove the two screws.
4. pop the center dash bezel off....just grab it and pull...pops off after the screws are removed.
5. The heater/ac controls will be held in by 4 philips screws...remove them and pull the controls out.
6. Inspect it.

Very simple, really just a few screws.
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Old 06-22-2009, 08:47 PM   #7
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I had kinda the same problem, Only high would work and now non work
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Old 06-22-2009, 08:49 PM   #8
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Quote:
Originally Posted by cret0013 View Post
I had kinda the same problem, Only high would work and now non work
Check the fuses first.
Then check the back of the switch for melting.
May just be the resistor pack for you.

What year is your jeep?
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Old 07-08-2009, 06:36 PM   #9
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Well I pulled the switch and it was fine so I started to chase down the wires. I had power to the relay because it clicked, no fuses blown. I had power to the fuse in the PDC but it didn't go from there to the motor. End result: looks like the previous owner was using a test light to look for a hot wire. Looks like they probed the wire and that opened the door for corrosion to eat the wire in two. So I cut out the bad section and replaced it , now I have 4 speeds!

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