Rear vents blowing cold when front vents blow warm?
Thread Starter
Senior Member
Joined: Mar 2015
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From: USA
Mercedes-Benz 2007 S550, 2012 S550 4-Matic, 2014 S550 (Traded), 2015 GL450
Rear vents blowing cold when front vents blow warm?
First off, Happy New Year to everyone! Hope everyone had a good Christmas and New Year's holiday.
Haven't been to these boards in a while, but now I have a question. When I have the climate control set to a warm temperature like 75F or 77F, there is warm air coming through the front vents. When I reach back to check the air temp coming through the rear center console vent, it blows cold? I don't have the rear climate control option so I thought the warm air from the front would just pass from the front to the back? Can someone tell me what's happening?
Haven't been to these boards in a while, but now I have a question. When I have the climate control set to a warm temperature like 75F or 77F, there is warm air coming through the front vents. When I reach back to check the air temp coming through the rear center console vent, it blows cold? I don't have the rear climate control option so I thought the warm air from the front would just pass from the front to the back? Can someone tell me what's happening?
MBWorld Fanatic!
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He doesn't have the rear control option so air from front just gets blown to the back. Now in heating mode the warm air comes from the foot well vents as opposed to the center vents. Center vents are used only for cold air/ air conditioning. However when target temp is "near" rear center vents will blow some cold- ish air to blend in the flow from the foot wells. What I am saying is that it is possible for this to be as designed behavior. If you think this is a problem just close the center vents for the cold season and call it a day. If rear passengers are hot ask them to open center vents as needed. You don't have rear climate control so rear temps are a compromise at best anyway.
Thread Starter
Senior Member
Joined: Mar 2015
Posts: 390
Likes: 26
From: USA
Mercedes-Benz 2007 S550, 2012 S550 4-Matic, 2014 S550 (Traded), 2015 GL450
He doesn't have the rear control option so air from front just gets blown to the back. Now in heating mode the warm air comes from the foot well vents as opposed to the center vents. Center vents are used only for cold air/ air conditioning. However when target temp is "near" rear center vents will blow some cold- ish air to blend in the flow from the foot wells. What I am saying is that it is possible for this to be as designed behavior. If you think this is a problem just close the center vents for the cold season and call it a day. If rear passengers are hot ask them to open center vents as needed. You don't have rear climate control so rear temps are a compromise at best anyway.
MBWorld Fanatic!
Joined: Aug 2014
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S500
there is a menu that you seldom find
go to middle bottom of the screen - click comand knob - follow menu
footwell temp plus minus 2 clicks either way
also defuse, focus and another - defuse is less noise and more moderate flow from more outlets
air volume - is related to the two auto modes you don't want
1) auto air flow means air vols is distributed around to best match temp set point, take from auto to big or small arrows (as in lots or less air volume) to screen feet face or all three
2) auto fan speed - as in rev it up make a noise and offend most of the time or manual leave it on 3 nudge back to 2 or 4 if u want to waste your time
go to middle bottom of the screen - click comand knob - follow menu
footwell temp plus minus 2 clicks either way
also defuse, focus and another - defuse is less noise and more moderate flow from more outlets
air volume - is related to the two auto modes you don't want
1) auto air flow means air vols is distributed around to best match temp set point, take from auto to big or small arrows (as in lots or less air volume) to screen feet face or all three
2) auto fan speed - as in rev it up make a noise and offend most of the time or manual leave it on 3 nudge back to 2 or 4 if u want to waste your time
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