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#1
04-14-2007, 01:24 PM
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Climate Control Seems Wierd?
I think there may be something wrong with my climate control control unit. I went through a sort of informal test this morning, and I think it has issues. Heres what I did:
Started car with ACC set to off. Set temperature wheel to min Set to EC mode Set fan to high nothing. Fan doesn't kick on, nothing. Set to defrost Fan kicks on pretty high and heat blows out Set to EC Fan goes down a notch and heat seems to be not quite as hot... might have taken more time to cool down What's going on here? Also, I recently replaced a changeover valve and have the halfway defrost and footwell pods disconnected (the lines are plugged) because the diaphragms are bad. With that, there are no vacuum leaks in the ACC system and all changeover valves work. My fuses are fine and I wiggled number 8 to see if it was keeping the blower from coming on in EC (then I tried defrost and found the fuse was fine). The blower was also recently replaced. What's going on here? Anyone have a way I could test it to get more usable results? 
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#2
04-14-2007, 01:29 PM
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#3
04-14-2007, 01:51 PM
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What? Where?
Where would the CCU relays be and how could I test them?
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#4
04-14-2007, 02:09 PM
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I didn't see where you listed what type of car you have. I have W123 - 300D and it was pretty common for them to have problems with the climate control module. This is the part with all the push buttons and the temperature control on the dash. It appears they suffer from a lot of bad connection from cold solder joints or micro cracking in the board traces.
I had the same exact problem as you described. Sometimes it would work and then it wouldn't and in a few days it would work again. I eventually went to a local salvage yard and bought a controller out of a junked W123. I haven't had any problems since then. You could also try removing your old controller and going over every solder joint. They can also be bought reconditioned on-line for a hefty price. TimK
__________________
EPA 609 & 608 HVAC Certified _________________________________________ 83' 300D Turbo - 300K + Miles 00' 1.9L TDI Beetle 85' 6.5L Turbo, GV-OD, GMC Suburban, 67' 2.5L Diesel NA - Land Rover Series IIA Here's what you do if it's so cold your diesel fuel gels. Smear some on some toast and stay inside until it warms up outside.
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#5
04-14-2007, 02:40 PM
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year and type of car might help
you will certainly get more replies.
Chris
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1987 300TD 309, xxx 2.8.2014 10,000 mile OCI Be careful of the toes you step on today, as they may be connected to the ass you have to kiss tomorrow. anonymous “Be who you are and say what you feel, because those who mind don’t matter, and those who matter won’t mind.” Dr. Seuss
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#6
04-14-2007, 02:48 PM
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Sorry, I've been meaning to add it to my sig... I'll go do that...
It's a 1984 300d turbo ACC type II IIRC
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#7
04-14-2007, 04:24 PM
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This is half bump and half me wondering what to do.
Where would relays for this be and is there any way to test them? If it's the push button unit solder problem, I assume I basically disconnect it, pull it out, take out the screws and disassemble it, and look for failed/bad looking solders? Is there anything that is generally the problem in these units?
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1984 300DT turbo 138k mi Still hauling me to school and back. Handy Site: http://www.dieselgiant.com/
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#8
04-14-2007, 04:34 PM
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I had similar problems, on the '82. I pulled the CCU, resoldered what I saw to be a problem, no change. Are the relays inside the unit?
__________________
83 SD 84 CD
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#9
04-14-2007, 04:38 PM
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#10
04-14-2007, 05:18 PM
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I seem to be encountering the problem where I can't get the back of the fan buttons off in order to get the unit completely apart.
I have the temp wheel off and the bottom off, but I can't get the fan buttons to come loose so I can take off the front and access the entire circuit board. What's the trick here?
__________________
1984 300DT turbo 138k mi Still hauling me to school and back. Handy Site: http://www.dieselgiant.com/
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#11
04-14-2007, 05:33 PM
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Okay, the trick to getting the fan buttons off so you can take off the white piece on that side is to pull the auto button completely out of the unit. There is an obvious white tab that you pull up to let it out.
Now I'm down to the front buttons... I'll keep going at it, but is there something I should know here?
__________________
1984 300DT turbo 138k mi Still hauling me to school and back. Handy Site: http://www.dieselgiant.com/
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#12
04-14-2007, 06:28 PM
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Looking around, it seems that my issue of the fan not kicking on unless I set it to defrost is caused by bad motor brushes?
I'm not familiar with exactly what those brushes are, but this is a brand new motor, and I don't quite see how this could happen... Anyway, I got the push button unit apart. I'll post pics of the circuit board in a minute.
__________________
1984 300DT turbo 138k mi Still hauling me to school and back. Handy Site: http://www.dieselgiant.com/
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#13
04-14-2007, 06:30 PM
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#14
04-14-2007, 07:08 PM
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Pics at http://s151.photobucket.com/albums/s138/arew264/Benz%20Push%20Button%20ACC%20Unit/
I don't see any bad solders there...
__________________
1984 300DT turbo 138k mi Still hauling me to school and back. Handy Site: http://www.dieselgiant.com/
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#15
04-14-2007, 07:31 PM
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Quote:
__________________
83 SD 84 CD
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