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Old 09-13-2002, 08:17 PM
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W140 blower issues...testing leads to "flaps"?

Original thread led most to Blower regulator but the following additional tests and help from Gilly causes questions about "flaps" directing air for fresh air and recirculated air. '93 400sel with intermittent problems of air volume from the blower changing power when moving dial, etc...New test: upon start-up yesterday had great air volume in low, medium and high with AC, EC and recirculate. This morning had little to no volume upon start-up in AC, EC but still heard what appeared to be normal blower power noises from the dash consistent with the setting of low, medium or high. The recirculate seemed to produce a little more air volume from the vent and interestingly the EC air volume was no where near the outside temperature of 50 degrees....How do these "flaps" work, how many, could they be getting in the way of blower air??? DIY fix??
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Old 09-13-2002, 09:23 PM
Gilly's Avatar
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Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
You just need to remove the same large phillips head screws you would remove to examine the blower motor itself. The large plastic intake grille is where the flap is, on the underside.
You can remove the colored plastic vacuum lines on the right side first, i use a 6mm open end wrench to lever them off of the vacuum servo. You want to see if the rods inside the cover is actually attached to the flap.
If you've never taken this cover off before, there are I belive 2 out in the middle of the cover, one on the far left and I belive 3 on the far right perimeter, really have to look for them though, especially the front and rear ones on the right side.

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