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#1
11-26-2007, 10:58 AM
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Another Climate Control troubleshoot
Just posting to help troubleshoot my climate control issues. This is on a 85 300D. When the key is in the accessory position, the blower works and blows when any button is pressed. When the engine starts none of the buttons work. I have replaced the blower motor brushes since that was an easy, cheap, and eliminates other problems. The blower works when hard wired. Do I need to look at the CCU and check for bad solder joints? That is my next suspect. Any suggestions on what it could be? Just want a second opinion before I dig into the dash.
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=========================== 85 300D 230K?? 96 Passat TDI Wagon 186K 
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#2
11-26-2007, 11:15 AM
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Couple of threads on this recently. Other people have found the problem lies in the key switch. Try moving the key slightly backwards towards the accessory position once the engine is running and see if it solves the problem.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#3
11-26-2007, 11:48 AM
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I recently removed my CCU and had a look at the solder joints. I too was having some intermittent blower issues so I figured it would be worth a look. Lo and behold, I DID find three cracked joints at one end of the unit where the large circuit board (CB) and the smaller side (vertical or perpendicular) CB is soldered together! That seems to have corrected the problem to this point!
Hope that helps... 
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Dale 1995 E320 Wagon 185K [SOLD] 1988 260e Sedan 165K 2007 F-150 XLT 188K [SOLD] 2003 Harley Davidson FLTRI Anniversary 26K ----------------------------- 2006 BMW 330Ci 110K - [SOLD]
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#4
11-27-2007, 04:00 PM
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Aha! It is the ignition/key switch. I jiggled the key and it worked. For now I will remember to just jiggle the key but I will pick up a new switch soon. Thanks for the help!
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=========================== 85 300D 230K?? 96 Passat TDI Wagon 186K
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#5
11-27-2007, 04:04 PM
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btw... is the switch that bad to replace? or is it a bugger to get to?
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=========================== 85 300D 230K?? 96 Passat TDI Wagon 186K
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#6
11-27-2007, 04:30 PM
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ok, just read some of the diy links. looks like it might be a good time to fix the odometer while i am at it. now i just need time. sheesh.
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=========================== 85 300D 230K?? 96 Passat TDI Wagon 186K
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