Foam on Blower Motor Flap Door

[emerydc8]

While I await my KAE Chinesium blower motor regulator from AHAZ, I noticed that the foam, once attached to the flap door inside the blower housing (pic), had disintegrated and mostly fallen off. I decided to vacuum it all off. I'm not sure if the foam serves a critical function. Anyone cross this bridge?

 

[gerryvz]

Hi Jon,

Yes, I encountered this last year when doing my Top-End Refresh. There is actually a cloth type cover that covers the foam, and on my car this has mostly sloughed off and was sort of hanging there. I removed it but did not mess with the foam, which as you are showing had pretty much disintegrated.

I thought of perhaps masking the whole area off, and trying to recover the flapper door with some sort of thick spray-on foam or rubbery paint coating, but decided not to do this and let it be.

 

[Trae]

Last year, foam started blowing out of the center vents in little pieces on the 92'.

I tell you, they just don't make foam the way they used to. . . Only lasted 30 years.

 

[Jlaa]

I just left it alone as well

 

[sheward]

I'm guessing the foam is there as sound insulation. Easily duplicated as mentioned.

drew

 

[gerryvz]

I think the foam also helps a bit with sealing against bleed air.

 

[Kyiv]

I just left it alone as well View attachment 138658

Jlaa's account have been hacked

 

[mikeym]

same here....totally disintegrated on my E320 when doing the motor replacement. left it alone.

 

[rayhennig]

totally disintegrated on my E320 when doing the motor replacement. left it alone.

Me too on '91 300CE.

RayH

 

[nocfn]

When I removed the dash and rebuilt the airbox for the C126, I used some adhesive backed foam in sheets to replace the foamed areas on the flaps of the airbox. Works pretty well so far and it does seal.

 

[gerryvz]

Note that the air flap on the E500E and C126 should NOT seal all the way and be air-tight. MB engineered it with a small air gap to allow incoming fresh air into the cabin, even with the ACC system totally OFF.

 

[nocfn]

I cut mine GVZ exactly where the witness marks were. One thing I did do on the C126 is I placed a large piece of nylon screening over the structural hole, this way debris will not ever get in the box again. I had a dead cicada, several leaves and multiple insect carcass.

 

[mikeym]

Note that the air flap on the E500E and C126 should NOT seal all the way and be air-tight. MB engineered it with a small air gap to allow incoming fresh air into the cabin, even with the ACC system totally OFF.

Talking about fresh air…. Is there any recommendation on if climate control should be turned off when turning off the car? I believe the flap closes regardless of climate control setting.

On my f-150, ford recommends to keep climate control in a position other than “off” so that the car can “breathe” when parked.

 

[gerryvz]

I've never seen any sort of recommendation on that. When the car is switched off, the ACC goes into a "rest" position (and as mentioned the fresh air flap is very slightly left open). When the car is switched on, the ACC system re-energizes into the last position it was used (also influenced by environmental parameters, inside temp input, and so forth).

 

[gsxr]

On the 124 with automatic climate control, all the flaps will return to the default position regardless of what buttons are pressed.