REST in W203 - missing?

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columb

Active Member
Joined
May 11, 2008
Messages
461
Location
Exeter, Devon
Car
W212
Hi,

Well winter is coming and I've realised that I should have REST in my MERC.
Strange as I don't have one in my W203! Is that by purpose (as not E or higher class) or just I don't know how to activate it?
Or do I need luxury climate control?

Cheers
Chris
 
On mine it is the button below the drivers temperature adjustment knob.
It is marked as EC / REST
 
Hi,
Or do I need luxury climate control?
Yep.

You can retrofit the panel (several posts on here about it) but that's maonly a cosmetic change - the additional functions don't work as the necessary workings pumps, filters etc aren't fitted.
 
the REST button in mine doesn't seem to do anything? it doesn't turn on, am I doing anything wrong? or should I get it looked at under warranty?
 
the REST button in mine doesn't seem to do anything? it doesn't turn on, am I doing anything wrong? or should I get it looked at under warranty?

The REST operation is quite subtle and you can hardly notice it whilst sat in the car.
It is more noticeable when you return to the car within about half an hour on a really cold/hot day.
To test it it is best to drive around for a little while then after removing the ignition key turn the temp knobs to either fully hot or fully cold and hit the REST button.
After a second or two you should hear the fans come on and feel the hot/cold air.
 
ah, so essentially it is a function that comes on with the ignition off? as when I press the button during driving nothing happens (the light on the button doesn't come on)
 
REST (Residual heat utilisation) comes with both 580 and 580 a/c units but only if you also have heated washer system (not just heated washer nozzles)

The system uses a secondary coolant circulating pump thats sits to the front of the coolant header tank.

You need to have option code 670
 
The REST operation is quite subtle and you can hardly notice it whilst sat in the car.
It is more noticeable when you return to the car within about half an hour on a really cold/hot day.
To test it it is best to drive around for a little while then after removing the ignition key turn the temp knobs to either fully hot or fully cold and hit the REST button.
After a second or two you should hear the fans come on and feel the hot/cold air.

Learn something new every day - I know it worked with heat (and very nice it is too!) but not with cool :cool:

If only I could remember to set it more often when I leave the car!! :crazy:
 
I'm not sure, but i think the Fan speed control needs to be above zero?



the REST button in mine doesn't seem to do anything? it doesn't turn on, am I doing anything wrong? or should I get it looked at under warranty?
 
REST Function.....
 

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