Air Condition/Heat slow to start
MBWorld Fanatic!
Joined: Mar 2015
Posts: 1,581
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From: Mass
2026 GLE 53 Coupe
Could this "delay" of the A/C or heat coming on after start-up be by design?
...so one doesn't get blasted initially with hot air during the Summer, or cold air during the Winter?
...so one doesn't get blasted initially with hot air during the Summer, or cold air during the Winter?
Junior Member
Joined: Jan 2015
Posts: 45
Likes: 0
2015 C300
I have also noticed the same thing when turning on the A/C. It is a drawback when the car is hot and you have to wait for the A/C to start cooling the car. I normally just crank up the fan.
It would be good to know why this happens. I've never had a car do this before.
It would be good to know why this happens. I've never had a car do this before.
Super Moderator
Joined: Jun 2008
Posts: 19,942
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From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Benz builds latency into everything. Supposed to give a feeling of refinement. They want their drivers to be calm & deliberate. Part of the Benz feel.
If heating is too delayed ensure operation of the auxiliary coolant pump. Later US W204's had this removed for cost saving reasons & heaters were severely compromised.
If heating is too delayed ensure operation of the auxiliary coolant pump. Later US W204's had this removed for cost saving reasons & heaters were severely compromised.
Last edited by Glyn M Ruck; Jun 1, 2015 at 08:55 AM.
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Member
Joined: Apr 2015
Posts: 111
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From: West Yorkshire - UK
BMW E60 525d MSport
My BMW does this..
Its due to on start up all monitored control messages / modules are checked to ensure all is ok, at that point the system (when in auto mode) will adapt..
Also, from a voltage regualtor point of view, it can take 7+ seconds for the charge voltage to stablise on start up.
Its due to on start up all monitored control messages / modules are checked to ensure all is ok, at that point the system (when in auto mode) will adapt..
Also, from a voltage regualtor point of view, it can take 7+ seconds for the charge voltage to stablise on start up.
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MBWorld Fanatic!
Joined: Jun 2007
Posts: 1,022
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From: Los Angeles, CA
2015 C400 Tenorite Gray
Benz builds latency into everything. Supposed to give a feeling of refinement. They want their drivers to be calm & deliberate. Part of the Benz feel.
If heating is too delayed ensure operation of the auxiliary coolant pump. Later US W204's had this removed for cost saving reasons & heaters were severely compromised.
If heating is too delayed ensure operation of the auxiliary coolant pump. Later US W204's had this removed for cost saving reasons & heaters were severely compromised.
MBWorld Fanatic!
Joined: Jun 2007
Posts: 1,022
Likes: 44
From: Los Angeles, CA
2015 C400 Tenorite Gray
Normal in that Mercedes is trying to improve mileage stats.
To me it’s annoying but there are more important things to worry about. I’m sure an independent with STAR could turn it off.
My W204 does not do this.
I can confirm that eco mode affects how soon the A/C comes on. Turn it off upon startup to maximize the cool down time.
To me it’s annoying but there are more important things to worry about. I’m sure an independent with STAR could turn it off.
My W204 does not do this.
I can confirm that eco mode affects how soon the A/C comes on. Turn it off upon startup to maximize the cool down time.
Senior Member
Joined: Jul 2019
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From: Bay Area, CA
2016 C300W4 (W205), Luxury Pkg, Diamond Silver Met. and Silk Beige\Espresso Interior
MBWorld Fanatic!
Joined: Jun 2007
Posts: 1,022
Likes: 44
From: Los Angeles, CA
2015 C400 Tenorite Gray
