DIY page. Introduction to Resoldering Climate Control Unit - Page 6 - PeachParts Mercedes-Benz Forum

88260e · #76 09-09-2009, 11:59 PM

I have the blower on and nothing comming out thing will sodering help this problem

Cr from Texas · #77 09-11-2009, 06:59 PM

Maybe, have you eliminated other possible issues such as bad fuse, bad blower motor, bad resistor, etc?

88260e · #78 09-11-2009, 11:26 PM

You can here the blower going but nothing comes out! Fuse is good!

Cr from Texas · #79 09-12-2009, 12:24 AM

If the blower is going, air should be coming out somewhere. Determine where: defroster, foot vents, dash vents, etc. What model car?

88260e · #80 09-12-2009, 02:25 PM

Yup I checked everywhere no air comming from any where. Its a 1988 W124 260E

Cr from Texas · #81 09-12-2009, 04:44 PM

I don't know your model. If it were mine, I'd start by opening the blower assembly to 1. Be certain the fan cage is turning, and 2. Begin looking for blockage. Seems to me if the cage is turning, it should be moving air, and it should be coming out somewhere inside the car.

Anyone else that knows this model have an idea?

Cr from Texas · #82 09-12-2009, 04:45 PM

Maybe you'd get more response it you started a new thread with the model in the title.

TOMCLARK · #83 09-23-2009, 12:42 PM

Quote:

As posted by "dynamitejacket" earlier in this thread

" my unit works okay, i.e. does not need resoldering, but sombody fat fingered the buttons and broke the spring keepers off most of them. as far as i can tell, i need to completely unsolder them from the boards and replace the whole pushbutton thingy. Anyone got a trick to replace the button posts without removing the whole switch body?"

I have the same problems on my 84 300SD Turbo. It has 2 push buttons and it looks like the lack of spring pressure is not allowing the switch to come out all the way.

I have the problem of an intermittent fan which has a mind of its own. It likes to go on and off whenever it wants. One of the bad push buttons is for the "Fan High" and the other is the center button on the ccu for "Bottom airflow".

I am in the process of re soldering the boards but I would love to be able to FIX the buttons without purchasing a complete ccu. Any help would be appreciated.

One thing I thought of doing was to epoxy a small ring or to drill a hole in the shaft to stick the end of the spring in, but I thought I'd ask before I make matters worse.

Luvmytat2s · #84 11-30-2009, 09:37 PM

Could anyone tell me how to test the resistor? Apparently, it's the weird looking metal cage thingie with coils in it on the passenger fenderwell....

TomJ · #85 11-30-2009, 10:48 PM

Quote:

Originally Posted by Luvmytat2s

Could anyone tell me how to test the resistor? Apparently, it's the weird looking metal cage thingie with coils in it on the passenger fenderwell....

Pretty simple, just unscrew it so you can see inside and test the terminals with an ohm meter to make sure there's continuity between the coils that connect to terminals. In other words, trace out a coil from where it starts at a connection terminal to where it goes to another terminal and measure the resistance. There shouldn't be any noticeable. It's pretty obvious when they go bad. You'll have infinite resistance and usually see it broken.

I have some of these (used/good) if you need one.

funola · #86 03-17-2011, 01:42 PM

I took apart a spare climate control p/n 123 830 12 85 down to the PC boards to see what's inside. There's 4 relays, a few resistors and diodes that's it! There are no IC's or transistors. I wouldn't call this thing a computer. Will post a pic later. What I plan to do is run this thing naked and see which relay clicks when the switches and temp dial is operated. The pdf I have of FSM 83-601 Manual and optical function test of automatic climate control has a wiring diagram that is illegible. Does anyone have a legible copy they can send me?

Yak · #87 03-17-2011, 08:41 PM

This page may help for info on what to look for/some troubleshooting steps:

http://userweb.windwireless.net/~jimc/mamerepairs.html#acctest

No pdf's there, just electrical troubleshooting info.

SD Blue · #88 03-18-2011, 04:50 PM

I'm not sure about the part #, but I believe the W126 and the W123 are the same for several years. Here are some for the W126:

Hmmm. The main electrical pdf is too large for an attachment by about 500 bytes. If these are what you are looking for, I will try it as a zipped file or some other method. Let me know.

nickjzee · #89 08-10-2011, 11:23 AM

Thank you BoostnBenz for a DIY that will stand the test of time. I attempted this last night. Fail. Now my vents shoot 120-140 degree heat with the AC on and temp selector set to "MIN". I was careful not to join two solders, so I think. Where do I start troubleshooting this? I can be emailed at zn24(at)aol.com

Thank you for any help.

ubertino · #90 10-02-2011, 01:06 PM

Bump for help. I'll be redo feeing my ccboard this afternoon, checking the resistor, and hopefully testing the blower motor. Where is the electric connection on the motor for me to hook up directly (to ensure it works). 1982 300tdt, 160k miles.

I've also not found a good DIY of the blower replacement, anybody found anything with sharing?