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  #1  
Old 12-31-2002, 05:03 PM
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W126 interior temperature sensor

First, my 420SEL has an interior temperature sensor located overhead next to the dome light - correct? Lately a squeek has started in the vicinity of the sensor, beginning as soon as I start the engine.... is there a tiny fan associated with the temperature sensor? The squeek sounds like a tiny bearing going bad, and is driving me crazy. I have looked in various parts catalogues, including fastlane, and can't find a fan associated with the temperature sensor. I recall a discussion in forum a year or so ago regarding such a fan, and I searched with various key words...but couldn't come up with anything. What else in the overhead dome light structure could cause such a squeek? Hint - the squeek goes away when I put my hand over the temperature sensor opening......

JoeB
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  #2  
Old 12-31-2002, 05:33 PM
DHA DHA is offline
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Perform a search at this site for "little electric motor/fan behind the dash"

Your problem could be the sampler blower motor, however that tiny motor is located either behind the glove box or, if you have air bags, above the passenger side footwell. Whether that sound can travel from the faulty motor, through the aspirating tube, to the sampling port near the dome light is a bit of a stretch....but, who knows?
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  #3  
Old 12-31-2002, 05:40 PM
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The little fan you are looking for is called the aspirator motor, and it blows air through one of the air vents up to the sensor near the dome light.

On W202's and W124's, the aspirator motor is inside the passenger air vent next to the glove box.

I'm pretty certain this is the cause of your squeak.
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  #4  
Old 12-31-2002, 11:03 PM
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I did a quick search for "aspirator" and found a bunch of responses. I usually struggle with the search function, but this time it worked for me. It seems everything is buried in the archives somewhere.

Mike Tangas posted this for W126's:

"Open and empty glove box. Remove the centers from the seven "plugs", then pull the plugs. Disconnect the glove box light and remove the glove box liner (it will take a bit of tugging - tight fit). Once the liner is out, you'll see the sampler blower just behind the vent. One hose and one two pin connector. The blower just snaps into a mount.

Word of caution, it is easy access but a tight fit depending on hand size. I had to use two hands to reconnect the hose and found I drew a little blood on the back of my hand, where it rubbed against the sharp edge of the glove box opening."
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2001 E430, Bourdeaux Red, Oyster interior.
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1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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  #5  
Old 12-31-2002, 11:14 PM
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Suginami, thanks!
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  #6  
Old 12-31-2002, 11:30 PM
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I did a quick search for "aspirator" and found a bunch of responses. I usually struggle with the search function, but this time it worked for me. It seems everything is buried in the archives somewhere.

Mike Tangas posted this for W126's:

"Open and empty glove box. Remove the centers from the seven "plugs", then pull the plugs. Disconnect the glove box light and remove the glove box liner (it will take a bit of tugging - tight fit). Once the liner is out, you'll see the sampler blower just behind the vent. One hose and one two pin connector. The blower just snaps into a mount.

Word of caution, it is easy access but a tight fit depending on hand size. I had to use two hands to reconnect the hose and found I drew a little blood on the back of my hand, where it rubbed against the sharp edge of the glove box opening."
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2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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  #7  
Old 12-31-2002, 11:48 PM
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thanks, concur it is a small constant-speed motor - but I need to know exactly where it is in W126 models.....moderators, can you help out?

JoeB
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  #8  
Old 01-01-2003, 12:19 AM
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It's directly behind the most right hand air vents and ducts in the dash. Remove glove box.. go right, and you'll feel it. It's the size of a small CPU fan (which makes a fine substitute). Follow Mike Tangas' directions; he never steers us wrong.


Edit: I think the posts are out of sequence with the New Year and the post times are showing from different zones on some of the threads....therefore; I was redundant
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Last edited by jbaj007; 01-01-2003 at 02:41 AM.
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  #9  
Old 01-01-2003, 04:22 AM
Mattman
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I just replaced my motor as the outlet where the hose connects had snapped off at some stage. The DPO had used hotglue and it eventually came apart again. The motor was about $75 US.

Matt
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  #10  
Old 01-01-2003, 12:16 PM
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Quote:
Originally posted by jbaj007
Follow Mike Tangas' directions; he never steers us wrong.

Awwww, thanks Golden , and you too Paul!
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  #11  
Old 01-01-2003, 12:31 PM
turbodiesel
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I think this miniature blower motor is located on top of the passenger kick panel once you remove it. I also have a squeek when I start my car cold for a few seconds and I tracked it down to a noisy transformer near my engine computer. It may not be the aspirator making the noise.
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  #12  
Old 01-02-2003, 11:20 AM
RON FINLAY
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I have a 124 and the motor was making a loud noise. I pulled it and applied some synthetic oil to the busihings several times after drving awhile and the noise has left. This is probably just a temporary fix, but it has lasted thus far.

Ron
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  #13  
Old 01-02-2003, 10:18 PM
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oustanding, thanks to all for your replies.

yes, several of the replies were posted out of sequence.....makes for interesting reading....and provides good training for having a discussion with your wife.....

JoeB
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  #14  
Old 01-03-2003, 02:11 AM
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would this motor be in a 1983 W126 as well? i dont remember seeing anything like that when i replaced the dashboard........... thanks
Ryan
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  #15  
Old 01-03-2003, 05:19 PM
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Hi everybody,
I tried to find the blower but can't. On a 1987 420 SEL (W126) the look to the right after the glovebox is out looks like this:
Where else to look?
Regards
Reinhard Kreutzer
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W126 interior temperature sensor-right-view.jpg  
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