Back seat heating
Thread Starter
Member
Joined: Nov 2014
Posts: 213
Likes: 6
C300
Back seat heating
Got a few really cold days recently. What I've noticed is that the vent in the back seat is lagging behind the front seat ones. I'd say it takes 2 or more minutes before the warm air coming out, compared to from the front seat ones.
Is this normal?
Thanks
Is this normal?
Thanks
Senior Member
Joined: Feb 2016
Posts: 295
Likes: 19
2016 C300
my old g35 was very similar, the rear vents were almost non-existent.
only compact sedan i've seen implementing a good rear ventilation system is Lexus IS. they even got vents coming from below the seats. but even for lexus the vents themselves throw very little air.
only compact sedan i've seen implementing a good rear ventilation system is Lexus IS. they even got vents coming from below the seats. but even for lexus the vents themselves throw very little air.
MBWorld Fanatic!
Joined: Feb 2016
Posts: 1,577
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From: Portland, OR
C450, GLC43
My F150 Lariat crew cab had pass through ventilation to the rear seat and it worked well. It still took a minute or two longer, relative to the front vents, before it would blow hot or cold. The hotter or colder the ambient temp the greater the lag time. You can't beat physics. The extra duct work will absorb heat when cold or transfer it when hot.
Senior Member
Joined: Apr 2015
Posts: 259
Likes: 10
From: Atlantic Canada
2016 C450 AMG
Remember that air going to rear vents has further to travel from the heater coil, so it is exposed to atmospheric air and more cold piping before it gets out of rear vents. Naturally, it will take longer for the rear air tunnels to warm up...
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MBWorld Fanatic!
Joined: Nov 2015
Posts: 1,192
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From: Oklahoma
2016 C300 4Matic traded in for a 2022 E450 Coupe
Just as it takes longer to get hot water to a faucet further away from the water heater.
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MBWorld Fanatic!
Joined: Mar 2015
Posts: 1,580
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From: Mass
2026 GLE 53 Coupe
Is this really a problem?
Every car I've ever owned did this...the warm air to the back has to travel farther through cold duct work under/between the seats...so of course it takes a little bit longer. Be happy with only a 2 minute delay.
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Joined: Jan 2015
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From: Manchester, UK
BMW e89 Z4 sDrive 35i & MB S205 C200 AMG Premium Plus
There's no way it takes two minutes to move air two metres. It's likely the auto setup is simply concentrating on the front first.
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Joined: Mar 2015
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From: Mass
2026 GLE 53 Coupe
