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S Chassis Technical discussion related to the S Chassis such as the S12, S13, S14, and S15.


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Old 01-03-2012, 05:20 PM   #1
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'89 240 with analog climate control problem

So all my illumination bulbs work, blower motor works on all speeds, and I can move the temperature blend door with control unit, but I can't change the mode door position and none of the mode leds light up . It seems to be stuck in the vent position.

I've made sure I had power to the mode door actuator. I followed the pinpoint test in the shop manual (starting with ha 72. ) I even replaced mode door actuator and the control unit just for shitz and giggles.

All of my fuses are good. The mode door moves fine, so I know something isn't blocking the door

Anyone else have issues with their climate control?

Any help is appreciated and thanks in advance,
Tim
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Old 01-03-2012, 08:27 PM   #2
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it sounds to me like you have a problem with the particular section in your climate controller, i have never heard of it happening in an s13 but my pathfinder which has basically the same type of climate control had a section go dark and all the buttons to change the vent directions stopped working, try changing the head unit i bet it will work, i even have one i could ship to you pretty cheap if you cant find one locally
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Old 01-03-2012, 08:59 PM   #3
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I had the same problem. My buttons were kinda gummed up so I removed the whole unit and removed the electronics. The soaked the whole thing in warm water and cleaned with just a household degreaser. Reinstalled every thing and it worked perfect. There's a thread on installing led illumination and it showed how to split it apart w/o fuckin it up... Hope this helps
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Old 01-04-2012, 09:07 AM   #4
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Thanks guys.
I tried a known good head unit just cause I had one lying around. It didn't change anything. I even tried a new mode door actuator, and still no change. I can manually change the mode door with the actuator off, so I know the actual door is ok.
I was thinking about just leaving the actuator off and moving it manually, but I'm trying to stay away from making this thing a missile.
I'll let you know if I find out anything else
Thanks again,
Tim
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Old 01-04-2012, 01:46 PM   #5
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i have the same problem , timohtee where did u get the new actuator from ?
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Old 01-04-2012, 02:18 PM   #6
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I unfortunately had to get one from the dealership. I wish I knew the part number.
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Old 01-04-2012, 02:50 PM   #7
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price how much thanks
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Old 01-04-2012, 05:23 PM   #8
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It was like 30 or 40 dollars?
If you wanna test your motor:
take it off the driver's side of the heater box
removed the cover (I think there's like 4 or 5 tabs)
apply 12 volts to the pins that go to the motor and see if it moves.

Both motors I had moved when I tested them.
Tonight I'm gonna check wiring to from the control head to the motor
I'll let you know what happens
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Old 01-12-2012, 02:05 PM   #9
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So did you ever fin out what the problem was?
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Old 01-12-2012, 02:08 PM   #10
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I have the same issue and can not find the solution anywhere
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Old 01-12-2012, 02:11 PM   #11
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I did! I didn't have power from the control head to the motor. So i checked for power from the fuse to the control head and I had nothing. I spent more time tracing wires and found the wire from my fuse (I can't remember what color it was,) was cut, probably when my alarm was installed. So I fixed that wire and magically my climate control was fully operational!!
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Old 01-12-2012, 02:42 PM   #12
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Nice I'll look to see any damages ti the wires


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