View Full Version : Electric Buzz Coming from Sunroof Switch
Hey all!
Just got my 96 C280 yesterday and I'm all excited to get started fixing it and never, ever stop fixing it as long as I own the car.
I'm planning to check the dual valve this weekend because the side air vents blow hot air when the A/C is on. CD Changer is not working and if I have to replace that, might as well get rid of the head unit and replace all speakers.
The problem I have yet to diagnose is the buzz coming from the general vicinity of the sunroof switch. It's constantly on when the car is on and dies slowly when the car is turned off. I had the thought that something may have come ungrounded. Any ideas?
jnenad16
07-06-2006, 03:36 PM
thats the ac sampler fan. it should be silent, but if its noisy, Im guessing its worn out or dirty.
this is the actual part behind the dome light cover:
http://www.autohausaz.com/secure/PartImages/1408300008.jpg
nenad
Brilliant!
Temperature Sensor Aspirator $70
Nice Nenad! Thanks!
kameraguy
07-07-2006, 05:18 PM
I had that same thing go out on my car, and I thought it was the most random pesty repair ever!!:confused:
I looked at it briefly yesterday and I'm having trouble figuring out how to actually get to the part.
Can you give me some idea of what I need to take apart how in order to get the piece out and look at it?
Renn 208
07-10-2006, 02:21 PM
Originally posted by Prez
I looked at it briefly yesterday and I'm having trouble figuring out how to actually get to the part.
Can you give me some idea of what I need to take apart how in order to get the piece out and look at it?
Just use your hands...A kind Mr. NL demonstrated for me...and while it's not recommended, you can pretty much get to it one handed while driving.
Gently pop out the right light lense (and maybe the left one too). then you should be able to grip the whole plastic lighting and switch base to pop it out from the rear facing side.
matt09
10-10-2006, 02:54 PM
HOW THE HELL DO YOU TAKE THAT BUZZER OFF!!!!!!!!!!
...I've been trying for more than an hour to take it off, and this is as far as I got:
http://i49.photobucket.com/albums/f274/matt091988/mbpics006.jpg
Please help me, I cant stand that noise anymore...
Renn 208
10-10-2006, 04:19 PM
twist the module off
matt09
10-10-2006, 04:21 PM
Clockwise? CounterCW? I tried but was scared of breaking whatever holds it.
Renn 208
10-10-2006, 05:17 PM
Try CCW first...should come right out. And you've already broken your old module...the base should be stronger. Trying to push in the tabs is kind of a bia bia.
hideric
10-13-2006, 07:23 PM
Has anyone ever had buzzing noise in where the light switch is on top of the roof. The noise seem to come from the right side in this little hole where the light switches in the car is located.
afetr two yrs, i noticed sound comes usually in winter(i lvie in canada btw) and does anybody know whjat the heck it is and how am i suppose to stop it?
its getting really annoying....
jnenad16
10-13-2006, 08:19 PM
its the ac sampler. its a little fan/sensor that measures the interior temp and adjusts ac output accordingly.
nenad
hideric
10-13-2006, 08:29 PM
its really annoying... it buzzes for like 30 mins once. Do u think i should like break it? coz i think im a better sensor for interior then a bee .
martattack
10-14-2006, 08:50 AM
Like nenad said, the a/c sampler sensor has worn out.
If you break it, your climate control probably may not correctly. When you set your temperature on your climate control unit, that sensor is what the system uses to meet that temperature.
matt09
10-14-2006, 09:29 AM
Its this bad boy:
http://i49.photobucket.com/albums/f274/matt091988/mbpics005.jpg
Cost me 68 bucks from autopartswarehouse.com, with free shipping and received it in 2 days!!!
nickaliath
10-30-2006, 04:25 AM
my car has the buzzing problem.
But mine hasnt got A/C
matt09
10-30-2006, 04:40 PM
Originally posted by nickaliath
my car has the buzzing problem.
But mine hasnt got A/C
Then unplug the sucker and you're set.
nickaliath
10-30-2006, 11:15 PM
yeah ive done that at the moment!
What i was trying to say though is what else is it for?
matt09
11-01-2006, 12:17 PM
Measures the temperature inside the cabin and tells the AC if it needs to blow more cold air or not. Since you have no AC, then its meaningless if you have it on or off. The only difference I think it will make is that when you push the "AUTO" button, it will start blowing air at medium speed instead of max. Oh, and you'll have to manually adjust the heater.
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