Mercedes-Benz Forum banner

1 - 12 of 12 Posts

·
Registered
Frankie aka Frankensteins Monster - 1989 W124 300D Automatic (righthand drive).
Joined
·
43 Posts
Discussion Starter #1
Hi,

I need some information and advice regarding a whining noise coming from behind the dash on the passenger side of my 1989 300D saloon.

It sounds like a compressor of some kind?

How do I go about removing the dash on the passenger side, so as to get to what ever it is that is whining away behind the dash?

Thanks. B.
 

·
Cruise Control
'87 300TD/'90 300D/'94 Quattro/'89 Vanagon TDI/'01 EV Weekender VR6
Joined
·
52,233 Posts
Perhaps it's a defective climate control sampler motor. I believe you have to remove the glovebox to gain access. They're not all that expensive or difficult to replace.
 

·
Premium Member
About a dozen 1988, 1989, 1990, and 1991 sedans, wagons, 4Matics and 1 coupe
Joined
·
5,454 Posts
It does sound like a dry bushing/worn out HVAC sampler motor. To get at it the glove box has to come out. Air outlet at the extreme right must also be removed to access a screw. Then the whole interior-color trim panel has to be removed. The sampler motor is clipped to that trim panel. It's a D-battery size affair connected to a rubber hose that runs up the A-pillar. Do a search on sampler motor. I know I've posted location pics.
 

·
W124 Moderator
86 190E 2.3L 16V, 2 95 320TE's, 02 S500
Joined
·
12,670 Posts
Use the search feature of the site and look for "glove box removal". The sampler motor lives behind it..

Good Luck,

Jayare
 

·
Registered
Frankie aka Frankensteins Monster - 1989 W124 300D Automatic (righthand drive).
Joined
·
43 Posts
Discussion Starter #5
Thanks guys, problem solved.

I removed the glove box and got my hands on the sampler motor.

I sprayed WD40 into the motor housing and that seems to have solved the noise problem.

One more question though.....the sampler motor has an outlet/inlet nozzle on it....is there supposed to be some kind of hose attached to it?

And no the car doesn't have A/C if you where going to ask.

Thanks again. B.
 

·
Registered
W124 400E, W126 500SE
Joined
·
971 Posts
the hose goes to the hole in the ceiling next to the interior light... there is the temperature sensor that takes measurement of the interior temperature.

Btw does anybody know how to get to the sampler motor on a W124 with passenger airbag? Mine stopped working and I have no idea where to start...
 

·
Registered
94 E320 Sportline sedan 86 190E 2.3 16V sedan 04 S430 Sport
Joined
·
678 Posts
My whining noise on the passenger side is usually my wife when she hears how much $$ that I have spent and what I plan on investing on my ride in the future. :)
 

·
Premium Member
About a dozen 1988, 1989, 1990, and 1991 sedans, wagons, 4Matics and 1 coupe
Joined
·
5,454 Posts
Yes, benz el, there should be a somewhat large rubber hose connected to one end of the sampler motor. That's why I said that the trim panel should be removed to access the motor. It's hard to work back there and get those parts connected and positioned correctly if you do the job through the glove box opening. Unless you have very small hands or two elbows on each arm.
 

·
Registered
Frankie aka Frankensteins Monster - 1989 W124 300D Automatic (righthand drive).
Joined
·
43 Posts
Discussion Starter #9
Oh dear!!!

Well augapfel my sampler motor does not have a hose attached to it.....which is why I asked.....as I thought it a bit odd. :eek:

And I was able to gain fairly ample elbow room by just removing the glove box and the passenger side air vent.

In the area where the interior light and sunroof switch is there are two holes to either side the one on the drivers side has a gadget in the hole which I take is a sensor? The other one has nothing!

I take it that there should be a sensor in that hole as well?

Back to the sampler motor......I must search for the hose to connect to the sampler motor......any ideas where I should start?

B.


PS. And I thought I had sorted the problem :rolleyes:
 

·
Premium Member
About a dozen 1988, 1989, 1990, and 1991 sedans, wagons, 4Matics and 1 coupe
Joined
·
5,454 Posts
You say that your car doesn't have A/C so it can't be a USA car (which is what I'm familiar with). All USA cars had automatic climate control and a single interior temp sensor, located behind a small grill directly ahead of the sunroof switch. I don't know what Euro cars had. You have dual temp control knobs, right? I suspect that Euro crs had only 1 interior temp sensor and used the heater core temp sensors to regulate output for left and right sides of the car.
The hose connected to the overhead assembly runs across the front of the roof and then down the a-pillar to the sampler motor. Can you see to the base of the a-pillar? There should be some sign of a 1 cm thick hose there somewhere.
 

·
Registered
Frankie aka Frankensteins Monster - 1989 W124 300D Automatic (righthand drive).
Joined
·
43 Posts
Discussion Starter #11 (Edited)
Ok....augapfel....

My car is indeed not an American model it is infact a british model so it differs slightly from the european model starting with being right hand drive rather than left hand drive.

I have dual temp control dials, one each side of the centre consol.

And there is no single grill forward of the roof control but as I mentioned before there are two round holes (about the size of a quarter) to either side of the roof control and interior light one of which has a grill in it, the other being empty.

I will have a look to see if I can see the base of the A pillar and if I can locate the hose perhaps tomorrow if the weather is fine.

Thanks again. B.
 

·
Registered
Frankie aka Frankensteins Monster - 1989 W124 300D Automatic (righthand drive).
Joined
·
43 Posts
Discussion Starter #12
I have found the hose and reconnected it!! Yay!

Thanks again augapfel....YOU my friend are the MAN!! :bowdown::bowdown:
 
1 - 12 of 12 Posts
Top