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Old 03-12-2010, 08:37 PM
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compress ignite compress ignite is offline
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Join Date: Feb 2004
Location: 32(degrees) North by 81(degrees) West
Posts: 5,554
Tube/Pipe /Conduit Fan Motor

The Aspirator Fan Motor sucks ("Negative Wind") Air from a tube that runs up the "A" pillar to the Temperature Sensor
[Little Slotted Plastic Square to the Left of the Front roof Cabin Light AND
just forward of the SunRoof Switch]

Without the CABIN air temperature Sensor information the CCU has no idea
how Hot or Cold the Interior of the Car is.

The test for the Fan Motor is to see if a 1" x1" square of paper is held up by
the Suction @ the square Sensor grid.

The Aspirator Fan Motor runs in all CCU push-button positions EXCEPT the one
on the farthest Right [Pictogram of Circle in a Square].

Picture of Cabin Air Temp. Sensor Intake below.
Attached Thumbnails
little fan motor tube thing behind the glove box??? - Early W124-cabin-air-temp-sensor-w124.jpg  
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'84 300SD sold
124.128

Last edited by compress ignite; 03-13-2010 at 07:58 PM.
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