heating blows hot when starting
Thread Starter
Newbie
Joined: Dec 2021
Posts: 6
Likes: 1
W223
heating blows hot when starting
Hello everyone
When I start my car in the morning, the heating is very strong at the start, for about ten minutes, forcing me to lower everything to put it back later to the desired temperature.
I guess it is a function "902 Heating and seats more in the front "
It is very unpleasant for me.
Do you have an idea to deactivate this and keep the heating pleasant?
Thanks everyone.
Cordially.
Big Dudu
When I start my car in the morning, the heating is very strong at the start, for about ten minutes, forcing me to lower everything to put it back later to the desired temperature.
I guess it is a function "902 Heating and seats more in the front "
It is very unpleasant for me.
Do you have an idea to deactivate this and keep the heating pleasant?
Thanks everyone.
Cordially.
Big Dudu
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Joined: Dec 2006
Posts: 6,499
Likes: 335
From: Europe
223.168 & 213.012 & 906.633 & 214.005
Specifically the outside temperature settings. 
902 seat heating plus for the front seats is "only" adds heated panels, door and centre console. Does not increase interior temperature in any way. If the ambient temperature is significantly lower than the set interior temperature, the car tries to get everything quickly to the set temperature. A compromise between annoying blower speed and time to reach the set temperature. I'm one who favours smooth blower operation. Not sure if the W223 has any settings to control this. It has been a bit different on different MB models, some more aggressive than others.
Hello everyone
When I start my car in the morning, the heating is very strong at the start, for about ten minutes, forcing me to lower everything to put it back later to the desired temperature.
I guess it is a function "902 Heating and seats more in the front "
It is very unpleasant for me.
Do you have an idea to deactivate this and keep the heating pleasant?
Thanks everyone.
Cordially.
Big Dudu
When I start my car in the morning, the heating is very strong at the start, for about ten minutes, forcing me to lower everything to put it back later to the desired temperature.
I guess it is a function "902 Heating and seats more in the front "
It is very unpleasant for me.
Do you have an idea to deactivate this and keep the heating pleasant?
Thanks everyone.
Cordially.
Big Dudu
Super Member
Joined: Nov 2021
Posts: 893
Likes: 397
From: Hong Kong, China
2021 S450 4Matic
Specifically the outside temperature settings.
902 seat heating plus for the front seats is "only" adds heated panels, door and centre console. Does not increase interior temperature in any way. If the ambient temperature is significantly lower than the set interior temperature, the car tries to get everything quickly to the set temperature. A compromise between annoying blower speed and time to reach the set temperature. I'm one who favours smooth blower operation. Not sure if the W223 has any settings to control this. It has been a bit different on different MB models, some more aggressive than others.
902 seat heating plus for the front seats is "only" adds heated panels, door and centre console. Does not increase interior temperature in any way. If the ambient temperature is significantly lower than the set interior temperature, the car tries to get everything quickly to the set temperature. A compromise between annoying blower speed and time to reach the set temperature. I'm one who favours smooth blower operation. Not sure if the W223 has any settings to control this. It has been a bit different on different MB models, some more aggressive than others.
If outside temp is, say, 5C and the car has sit outside overnight, the interior temp can be, say, 10C. If the desired temp is set to 22C, the fans could then spin in full speed, blasting full amount of hot air.
One remedy is probably not to use 'Auto' and to use manual fan speed control.
Super Member
Joined: Jun 2017
Posts: 577
Likes: 195
From: PA
W223 S500 LWB 4-Matic, W222 S450 LWB 4-Matic, A238 E400 Cabriolet 4-Matic
You can ask Hey Mercedes to "turn the fan speed to" (specific number) "1" 2 or 3 and so on and it still stays in the AUTO mode if enabled. I noticed sometimes if you try to slow the fan speed down manually it knocks the system out of AUTO mode.
Super Member
Joined: Sep 2020
Posts: 667
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From: Los Angeles
Panamera, '63 Impala
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Thread Starter
Newbie
Joined: Dec 2021
Posts: 6
Likes: 1
W223
Hello.
Yes it works like that in all cars and I can lower the temperature and / or the blower then turn it back on or change the temperature later.
But it's much louder ( violent) than other cars and the feeling becomes unpleasant.
And since I do a lot of short trips,
I often regulate the temperature whereas in my other cars I never did. 20 degrees, auto mode and I didn't touch it anymore.
Well, it's not very serious, just annoying.
Have a good day
gros Dudu
Yes it works like that in all cars and I can lower the temperature and / or the blower then turn it back on or change the temperature later.
But it's much louder ( violent) than other cars and the feeling becomes unpleasant.
And since I do a lot of short trips,
I often regulate the temperature whereas in my other cars I never did. 20 degrees, auto mode and I didn't touch it anymore.
Well, it's not very serious, just annoying.
Have a good day
gros Dudu
Last edited by grosdudu; Jan 11, 2022 at 12:43 PM.
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