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#1
04-26-2008, 09:52 PM
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C230 AC Blower singing
My 2000 C230 AC blower has recently started to sing when turned on. I thought it was a bearing problem but when I removed the blower and ran it with a straight DC source it is quiet all the way from 3 volts to 12 volts. If I hook it up through the Voltage Regulator then it starts to sing. More on the lower speed settings than on the high speeds. If I move the red wire up or down at the regulator the sound changes or disappears. I assume that this is a bad regulator but just want to get some verification before I spend the $175 for another one. Anyone have a similar problem or know how the regulator works to explain what is going wrong with it?
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Dave 88 300E 250K Sold 2000 C230K Totaled @104K  2003 ML320 156K Sold 2009 E350 4Matic Sport 46K Sold 2011 ML350 60K Sold 2014 GLK350 46k 2012 GL450 55K 
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#2
04-26-2008, 10:11 PM
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If the sounds are from the center vent it may be low of refrigerant.
Check and post the actual values from the CCU. Engine on and AC at 72f and on auto. Press and hold "Rest" for 5 secs, use auto buttons to toggle screens and post values 1-8.
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Terry Allison N. Calif. & Boca Chica, Panama 09' E320 Bluetec 77k (USA) 09' Hyundai Santa Fe Diesel 48k (S.A.)
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#3
04-27-2008, 08:41 PM
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Thank you for the reply Terry. I have the manual CC and there are no diagnostics built in as ther is no LCD panel. This noise is present with the blower out of the dash. AC and heat work fine just the squeal when the blower is powered through the regulator. I could hold the assembly in my hand and press on the contact or lift the contact and the noise will go away. I took the regulator off of the blower and same result the noise is deffinately coming from the regulator. I just thought it was all solid state and should not buzz internally. The noise is about 6Khz but varies with the speed. My thought was could an overcurrent condition cause the regulator to buzz. If I power the blower from a seperate DC supply from 3 volts to 12 volts the motor is quiet and the current looks ok.
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Dave 88 300E 250K Sold 2000 C230K Totaled @104K 2003 ML320 156K Sold 2009 E350 4Matic Sport 46K Sold 2011 ML350 60K Sold 2014 GLK350 46k 2012 GL450 55K
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#4
04-28-2008, 04:42 PM
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First let me say that I know nothing specifically about your car or this problem. However, from the point of view of electronics I can address your statement about solid state electronics. Electronics can indeed make noise. Especially switching regulator circuits. I do not know what type of regulator is in there but I have seen cases where a capacitor goes bad and will make noise. I am not talking about blower regulators but just regulators in general. Anyway it sounds like you have figured it out yourself: Get a new regulator.
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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine) 1988 F150 144,000 miles (leaks all the colors of the rainbow) Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra
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