REST button

[dan f]

Hi.

I have noticed a second LED on the recirc button on our SLK that is on the bottom right hand side and is labelled 'rest'.

How do you activate it and what does it do?

Cheers,
Dan.

 

[996jimbo]

That's the one you use when you're in James Bond spy mode. If you're on a stake-out you clearly don't want to leave the engine running 'cause the bad guys might spot you. When you switch it off however you'll get cold. So, you switch the engine off then press the REST button and the heater system will power up and work for a while on the residual heat left in the system.

Not much good on a long stake-out as the heat will gradually go as will your battery, but OK if you've not got to hang around too long.

If you're not in the spying business it will operate just as well in Tesco's car park keeping you warm whilst the rest of the family goes and buys your supper.

 

[panason1c]

This is a feature that utilises the residual heat in the engine cooling system to keep the cabin interier warm after the (hot) engine is switched off........To activate it, with the engine 'off', press the 'rest' button and the heater will keep the interier warm for about half an hour after which it will switch off when either the coolent temp has dropped below a certain temperature, or, if the battery voltage drops below a pre-set level.
It will function even if the keys are removed from the ignition.

 

[996jimbo]

the heater will keep the interier warm for about half an hour after which it will switch off when either the coolent temp has dropped below a certain temperature, or, if the battery voltage drops below a pre-set level.
It will function even if the keys are removed from the ignition.

...which means that if your Ruskie 'target' nicks your keys whilst you're temporarily distracted by some bint with a name related to her promiscuousness or part of a womans anatomy, you can still enjoy half an hour of 'Bond' work before being disabled by the inclement weather.

Thank goodness for Mercedes and their odd gadgets.

 

[dan f]

LOL. :grin:

Thanks for the replies.

Dan.

 

[blassberg]

if the battery voltage drops below a pre-set level.
It will function even if the keys are removed from the ignition.

Wish the ML power socket had the same intelligence ref story about leaving a fridge plugged in overnight.

Mobilolife said it was my fault and would charge £150 in many hours to jump start my car. Fortunately it was a company car and I called green flag who came in 15 minutes and started it free of charge.

(suppose all flat batteries are free of charge.....)

 

[calum]

That's the one you use when you're in James Bond spy mode. If you're on a stake-out you clearly don't want to leave the engine running 'cause the bad guys might spot you. When you switch it off however you'll get cold. So, you switch the engine off then press the REST button and the heater system will power up and work for a while on the residual heat left in the system.

and equally well for Cold in the summer, too, of course.

 

[andy_k]

and equally well for Cold in the summer, too, of course.

surely not, it's only using the system's residual heat to warm the car up, unless I am very much mistaken cars get just as hot and don't store residual cold in the summer

Andy

 

[calum]

surely not, it's only using the system's residual heat to warm the car up, unless I am very much mistaken cars get just as hot and don't store residual cold in the summer
Andy

Actually, they do, at least as far as I'm aware. There is a fair amount of cold air left in the A/C compressor, and relating pipework, and REST will continue to blow so that you get it into the cabin.

and the A/C cooling agent will stay cool for some time, too.

Anyone else confirm this, or am I going mad?

 

[jberks]

Sounds good in theory but I doubt it in reality. Switch off the aircon on a normal day, and the air warms up in seconds. The engine is a big hot iron block full of hot water, so heat will be retained for a fair while. The residual heater does it's job but running an electric pump to continue to cycle water from the block through the heater matrix, so wringing out as much heat as possible. Even then, the fan only runs at a very slow speed. There is no circulation in the aircon system once the compressor stops, so once the rad is warm, that it - I suspect no more than 30 seconds on a warm day.

 

[panason1c]

"and equally well for Cold in the summer, too, of course".

Using the 'rest' function in summer will operate the blower but the air will NOT be cooled by the air con as there is no 'residual' chilled air (the air is only cooled when the engine/air-con compressor is actually running) , therefore, the air blown into the cabin will be at outside ambient temp.

 

[calum]

"and equally well for Cold in the summer, too, of course".

Using the 'rest' function in summer will operate the blower but the air will NOT be cooled by the air con as there is no 'residual' chilled air (the air is only cooled when the engine/air-con compressor is actually running) , therefore, the air blown into the cabin will be at outside ambient temp.

yup, consider me well and truly told
now that I think about it, of course, it sounds wrong, as you've both pointed out.

Now to try and remember who sold me this piece of wrong info