Very little air coming out from heater
Thread Starter
Junior Member
Joined: May 2011
Posts: 18
Likes: 1
2000 S430
Very little air coming out from heater
I get very little airflow from the vents when the heat is on, I can hear the blower moving air but it seems like the heat flow is being blocked from one of the flappers behind the dash. The A/C blows a lot of air and the fan control works accurately so it seems like the blower motor and regulator may be ok.
I also have fault code B1268 Communication fault of A/C bus w/ control unit N18/4 (Center vents electronic control module)
Does it look like my symptoms are due to the #5 Center Outlet Blend Flap not opening? Any idea what controls this? (see diagram in link below)
http://www.mercedestechstore.com/pdf...2010-30-02.pdf
I also have fault code B1268 Communication fault of A/C bus w/ control unit N18/4 (Center vents electronic control module)
Does it look like my symptoms are due to the #5 Center Outlet Blend Flap not opening? Any idea what controls this? (see diagram in link below)
http://www.mercedestechstore.com/pdf...2010-30-02.pdf
Last edited by rnitto; Jan 1, 2013 at 04:08 PM.
MBWorld Fanatic!
Joined: Jun 2002
Posts: 1,284
Likes: 37
From: North Carolina
2003 S500 - Toyota Corolla (in the rain)
Looking at your diagram on page 7, vents 7 and 8 I don't think I ever get any airflow out of those vents when my heat is on. I always keep my climate control on automatic and the temp is usually set at 72 degrees year round. I always thought it was strange that no air came from those vents with the heat but they work when the ac is on. I think it is designed that way.
Thread Starter
Junior Member
Joined: May 2011
Posts: 18
Likes: 1
2000 S430
Thanks for the reply! You know what's strange now that I think of it, I think I didn't feel much heat come out of these vents either on the other car I test drove AND my previous W220.
Check out Page 11 and you will see flap #5 which is the center vents. This is what I thought may have been stuck but I'm not sure now. The car does get warm inside, I Just don't feel the heat "blow"
http://www.mercedestechstore.com/pdf...2010-30-02.pdf
Check out Page 11 and you will see flap #5 which is the center vents. This is what I thought may have been stuck but I'm not sure now. The car does get warm inside, I Just don't feel the heat "blow"
http://www.mercedestechstore.com/pdf...2010-30-02.pdf
