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#1
09-30-2014, 05:40 PM
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W123 CCU Buzzing/Rattling
Heard a buzzing/rattling sound coming from the CCU on my 84 300D (I removed it to confirm the sound was actually coming from inside the CCU). At first I thought it might have been some mechanical resonance from the car. But no....I confirmed that it's coming from the CCU itself. It goes away when I disconnect that cable on the left....it also goes away when I rev the engine.
Is there some fan inside the CCU that is going bad? Any thoughts as to how to address....other than getting JamesDean to rebuild the thing?
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife Last edited by shertex; 09-30-2014 at 06:02 PM. 
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#2
10-01-2014, 07:39 AM
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Or perhaps it's a very rapidly clicking relay?
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#3
10-01-2014, 09:20 AM
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Not sure if I got your full meaning when I read your post for the first time.
So you have the CCU in hand and have confirmed that it is actually buzzing? I get a buzzing from that area of dash from time to time, in some cases when the ambient temperature drops suddenly, but more often as a symptom of a vibration from under the hood being transmitted through the dash.
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 Mac 2002 e320 4matic estate│1985 300d│1980 300td Previous: 1979 & 1982 & 1983 300sd │ 1982 240d “Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22
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#4
10-01-2014, 10:17 AM
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Quote:
I have a 10 second .mov file of the noise but can't attach it. It sounds like a Geiger counter going bonkers!
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#5
10-01-2014, 11:09 AM
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A forum member listened to the noise and said it's definitely the sound of a relay. So then the question becomes whether it's the CCU itself that's bad or some external electrical factor that's causing the relay to do that.
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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