AC Question? - Mercedes Benz SLK Forum

General Discussion Topics must pertain to all 3 generations of SLK - R170, R171 and R172

 
LinkBack Thread Tools
#1 Old 09-04-2011
Sadly Gregg has passed away

 
Gregg's Avatar
 
Join Date: Oct 2009
Location: Southern Illinois
Vehicle: 2009 SLK 350
Other Toys: 2012 ML350, Truck, and Tractor
Posts: 2,432
Country:
Chats: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
Thanks: 1,406
Thanked 458 Times in 279 Posts
Garage
(Thread Starter)
Question AC Question?

Is it helpful mechanically to turn off the AC before stopping the engine? What about letting the engine function on startup for a minute or two before turning on the AC?

This issue is quite controversial with my coffee clatch....seems most of us just leave the AC on full time in trucks and tractors.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Gregg is offline  
Sponsored Links
Advertisement
 
#2 Old 09-04-2011
Registered Users
 
Rextter's Avatar
 
Join Date: Jul 2011
Location: Durham UK
Vehicle: SLK 280
Posts: 241
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Thanks: 64
Thanked 40 Times in 29 Posts
Garage
I've always understood AC to drain the battery and power whilst driving so only use mine whilst cruising on a hot day. OK, so living in the UK we use the hot air blowers for 363 days and the AC for only 2 days of the year so it's maybe not so noticeable for us - unfortunately

In previous cars I've noticed a drain on engine power whilst using the AC on a hot day as well as an increase in fuel consumption.
Rextter is offline  
The Following User Says Thank You to Rextter For This Useful Post:
#3 Old 09-04-2011
Premium Member
 
Join Date: Sep 2010
Location: Phoenix
Vehicle: 1999 slk 230
Other Toys: 1966 Mercedes Heckflosse
Posts: 14,453
Country:
Chats: 0
Mentioned: 14 Post(s)
Tagged: 0 Thread(s)
Quoted: 526 Post(s)
Thanks: 1,119
Thanked 1,418 Times in 956 Posts
Garage
I guess been in Phoenix that A/c runs good 9 month out of the year. I have switch the A/c on after the motor runs for a moment. Also i switch the A/c off before i shut the engine off. I guess it is just a habbit of mine. If i leave the A/c on while starting the engine i get a puff of hot air before it blows cold.
Berliner Heckflosse is offline  
The Following User Says Thank You to Berliner Heckflosse For This Useful Post:
 
#4 Old 09-04-2011
Sadly Woolly has passed away

 
Woolly's Avatar
 
Join Date: Jun 2006
Location: Co. Durham, UK
Vehicle: SLK350 MT
Other Toys: CLK 270CDI (Slushbox!!)
Posts: 17,375
Country:
Chats: 1297
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 120 Post(s)
Thanks: 2,912
Thanked 3,515 Times in 2,416 Posts
Garage
It's more economical in the long term to keep the AC running all the time - which is why MB have designed it that way on the R171 - you have to make a conscious effort to turn it off, and even then, it will default to 'on' at the next restart. As to 'draining the battery' - if you get battery drain whilst the engine is running, then you need a new alternator/AVR.






To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

MB SLK 350 Andradite Green (6 speed manual)

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Woolly is offline  
The Following User Says Thank You to Woolly For This Useful Post:
#5 Old 09-04-2011
Registered Users

 
Gbarringer100's Avatar
 
Join Date: May 2009
Location: Little River, SC
Vehicle: 2013 SLK250
Other Toys: 2016 GLA250
Posts: 2,317
Country:
Chats: 0
Mentioned: 6 Post(s)
Tagged: 0 Thread(s)
Quoted: 100 Post(s)
Thanks: 12
Thanked 404 Times in 350 Posts
Garage
I do believe in the start mode all power to most everything is auto turned off except the start motor and the engine stuff needed for it to run and safe stuff until the engine starts anyway. AC, radio and etc will be in an off mode.
Gbarringer100 is offline  
The Following User Says Thank You to Gbarringer100 For This Useful Post:
#6 Old 09-04-2011
aka John

 
UK-C200's Avatar
 
Join Date: May 2008
Location: Richmond, Tx
Vehicle: LHD Black SLK350, LHD Firemist SLK55
Other Toys: Nacra F18
Posts: 13,012
Country:
Chats: 1143
Mentioned: 13 Post(s)
Tagged: 0 Thread(s)
Quoted: 30 Post(s)
Thanks: 1,712
Thanked 2,920 Times in 2,028 Posts
I tend to leave mine turned on all the time, and just adjust the temperature.



UK-C200 is offline  
The Following User Says Thank You to UK-C200 For This Useful Post:
#7 Old 09-04-2011
Sadly Woolly has passed away

 
Woolly's Avatar
 
Join Date: Jun 2006
Location: Co. Durham, UK
Vehicle: SLK350 MT
Other Toys: CLK 270CDI (Slushbox!!)
Posts: 17,375
Country:
Chats: 1297
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 120 Post(s)
Thanks: 2,912
Thanked 3,515 Times in 2,416 Posts
Garage
Quote:
Originally Posted by Gbarringer100 View Post
I do believe in the start mode all power to most everything is auto turned off except the start motor and the engine stuff needed for it to run and safe stuff until the engine starts anyway. AC, radio and etc will be in an off mode.
Correct, whilst the engine is starting, but once it's up & running, a lot of systems are turned on automatically by default, including (on the R171) the AC.






To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

MB SLK 350 Andradite Green (6 speed manual)

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Woolly is offline  
The Following User Says Thank You to Woolly For This Useful Post:
#8 Old 09-05-2011
Registered Users

 
sokoloff's Avatar
 
Join Date: Jun 2009
Location: Ocean Isle Beach, NC
Vehicle: 2003 SLK320 31,000 miles
Posts: 1,314
Country:
Chats: 3
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 66 Post(s)
Thanks: 27
Thanked 231 Times in 161 Posts
Garage
Not turning the AC on for long periods of time also tends to dry up the sealing rings causing leaks in the system. On my automatic climate control sedan, the AC/climate control is always left on. On the SLK I tend to leave the AC on. No battery issues on the sedan - jury still out on the SLK.

Len

Len
2003 SLK320 40,000 miles - now lives in Tucson with my daughter
1959 220S Cabriolet - sold - now lives in Malta
1983 240D 351,000 miles original owner - sold
1999 E300D 215,000 miles
2014 Smart electric 17,000 miles
2014 Smart electric 9,000 miles
sokoloff is offline  
The Following User Says Thank You to sokoloff For This Useful Post:
#9 Old 09-05-2011
Sadly Gregg has passed away

 
Gregg's Avatar
 
Join Date: Oct 2009
Location: Southern Illinois
Vehicle: 2009 SLK 350
Other Toys: 2012 ML350, Truck, and Tractor
Posts: 2,432
Country:
Chats: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
Thanks: 1,406
Thanked 458 Times in 279 Posts
Garage
(Thread Starter)
Quote:
Originally Posted by Woolly View Post
Correct, whilst the engine is starting, but once it's up & running, a lot of systems are turned on automatically by default, including (on the R171) the AC.
So Woolly....are you saying that in the R171 the AC compressor is always in the "on" mode even when the small red light on the switch is inactive?

On my big Ford truck the AC runs constantly in every mode including defrost but does not run in the basic heat mode. Kind of weird to me that it runs in the dead of winter, but I suppose it aids in defrosting and controlling the temp of the hot air!


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Gregg is offline  
#10 Old 09-05-2011
Sadly Woolly has passed away

 
Woolly's Avatar
 
Join Date: Jun 2006
Location: Co. Durham, UK
Vehicle: SLK350 MT
Other Toys: CLK 270CDI (Slushbox!!)
Posts: 17,375
Country:
Chats: 1297
Mentioned: 10 Post(s)
Tagged: 0 Thread(s)
Quoted: 120 Post(s)
Thanks: 2,912
Thanked 3,515 Times in 2,416 Posts
Garage
Quote:
Originally Posted by Gregg View Post
So Woolly....are you saying that in the R171 the AC compressor is always in the "on" mode even when the small red light on the switch is inactive?
Yup, bizarrely (?), the red light is only on, when the AC is off. Whilst it is running, the seals carry on sealing, and the compressor caries on compressing - it's only if you physically turn it off every time you drive it (and the red light comes on) that you might start getting problems. As well as cooling the air when it's hot outside, the AC dehumidifies the inside air when it's cold outside - stops the windows steaming up.






To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

MB SLK 350 Andradite Green (6 speed manual)

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Woolly is offline  
#11 Old 09-05-2011
Registered Users
 
Yeoblade's Avatar
 
Join Date: Dec 2010
Location: Somerset UK
Vehicle: SLK 350 Auto7G, 2005 R171
Other Toys: RX8 PZ , CBR100 rr Fireblade
Posts: 83
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 2 Post(s)
Thanks: 31
Thanked 6 Times in 5 Posts
Garage
Quote:
Originally Posted by Woolly View Post
Yup, bizarrely (?), the red light is only on, when the AC is off. Whilst it is running, the seals carry on sealing, and the compressor caries on compressing - it's only if you physically turn it off every time you drive it (and the red light comes on) that you might start getting problems. As well as cooling the air when it's hot outside, the AC dehumidifies the inside air when it's cold outside - stops the windows steaming up.
Yep thats definitly the way it works, I have had many problems with mine and check it regularly.
If the RED LED is on the A/C is OFF. You can easily prove the A/C is off just by lifting the Hood and touching the AC pipe, it's alloy and gets super cold and covered in condensate when AC is active.
I can hardly tell by engine noise/load if AC is on or off as is often common on many cars. SLK350
Yeoblade is offline  
#12 Old 09-05-2011
Registered Users

 
Der Flieger's Avatar
 
Join Date: Sep 2010
Location: Ottawa Ontario
Vehicle: silver/red 06 350
Other Toys: 2011 MB C 300 4matic! and 06 Mazda 3; fly B767-300ER
Posts: 6,796
Country:
Chats: 38
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 123 Post(s)
Thanks: 1,039
Thanked 820 Times in 659 Posts
Garage
Send a message via MSN to Der Flieger Send a message via Yahoo to Der Flieger
Most modern cars use the A/C to defrost when it's hot outside - ie. if you have the temp control to cold, and you select defrost, it engages the A/C which pumps cold, but dry, air to the windscreen. You'll notice that you'll often get condensation on the outside of the window.
On the SLK when you select defrost you get 1000 degree C air regardless!
Der Flieger is offline  
#13 Old 09-05-2011
Founding Member #2

 
etyu's Avatar
 
Join Date: Jun 2006
Location: Orange County, CA
Vehicle: 2008 SLK 55
Posts: 19,392
Country:
Chats: 11
Mentioned: 80 Post(s)
Tagged: 0 Thread(s)
Quoted: 345 Post(s)
Thanks: 4,571
Thanked 3,142 Times in 2,269 Posts
Garage
IIRC, the airconditioning button is different in earlier model year R171. As Woolly stated it is default to on (the control button will be labeled A/C OFF, so if the red LED is on, it means A/C is off) in earlier models.

Later models (R171) show only A/C. In this case a lit red LED means A/C is on, and when the LED is unlit, the A/C is off. This is on my 2008 R171.

Eddy



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Pewter(cubanitsilber metallic)/Beige, PIII package, Airscarf, Hands-Free Communication System, Lighting package; Designo Black Leather Cover on e-brake handle(Thank you Bill T), SmartTop v3.x, John's 3BFM, M113 AMG OEM air filters, Modified R170 ant., clear side-markers & front parking lamps w/error-free LEDs, chromed front & rear turn indicator lamps, steel mesh at battery bay cover & cabin air intake, sock-over-seatbelt buckles, belt-loop guide protectors, Lamin-X fog lamp protectors, bilateral rear fog lamps enabled, AMG crest on gear shift knob
etyu is offline  
#14 Old 09-12-2011
Registered Users

 
Der Flieger's Avatar
 
Join Date: Sep 2010
Location: Ottawa Ontario
Vehicle: silver/red 06 350
Other Toys: 2011 MB C 300 4matic! and 06 Mazda 3; fly B767-300ER
Posts: 6,796
Country:
Chats: 38
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 123 Post(s)
Thanks: 1,039
Thanked 820 Times in 659 Posts
Garage
Send a message via MSN to Der Flieger Send a message via Yahoo to Der Flieger
Stirring the pot...

06 SLK 350, originally US.

The AC switch is default OFF, including if you run the temperature down below 16C (60 which causes the cabin fans to run MAX even in AUTO. However, if you cycle the AUTO switch, it will make the AC come on. That said, AC on has a red led, AC off is light out.
Der Flieger is offline  
#15 Old 09-12-2011
Registered Users
 
Join Date: Jan 2010
Location: Simi Valley, CA
Vehicle: 2006 SLK55
Posts: 659
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 9
Thanked 210 Times in 116 Posts
Garage
Quote:
Originally Posted by sokoloff View Post
Not turning the AC on for long periods of time also tends to dry up the sealing rings causing leaks in the system. On my automatic climate control sedan, the AC/climate control is always left on. On the SLK I tend to leave the AC on. No battery issues on the sedan - jury still out on the SLK.

Len
Bingo! This is why they make them come on either all the time, or first on the switch. (so the a/c turns on before you get to the heater). There is one more problem with leaving them off for longer periods of time.. the refrigerant will condense and then when you turn on the system, it tries to pump a liquid instead of a gas.. thus blowing out the seals.
Todd157k is offline  
#16 Old 09-21-2011
Registered Users
 
bobsquad7's Avatar
 
Join Date: Apr 2008
Location: OKC, Ok
Vehicle: slk350
Other Toys: R1200GS, Freightliner Class-8-RV conversion, 06 E320 CDI
Posts: 49
Country:
Chats: 0
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Thanks: 0
Thanked 17 Times in 9 Posts
After reading a number of articles on this subject, I've come to some conclusions that seem to make sense.
#1. I always turn the AC compressor off a mile or so before shutting the car off, and turn the blower fan to high. This blows most of the accumulated condensation out of of the evaporator and prevents that stinky smell when you drive it the next time.
#2 I usually drive a mile or so before turning the AC compressor on, whether just leaving the house or when running errands. After the car has been driven for a couple of minutes, there is ambient air flow through the AC condensor and through the engine compartment which eases the AC system start up as the high & low pressures in the system tend to equalize.

I also turn the compressor on when the engine is at idle. Again, this is easier on the compressor, the compressor clutch, and the drive belt.

I've driven a couple of vehicles in excess of 250K miles doing this & not had any AC problems, . . . .so maybe it works!!
bobsquad7 is offline  
The Following User Says Thank You to bobsquad7 For This Useful Post:
#17 Old 09-21-2011
Sadly Gregg has passed away

 
Gregg's Avatar
 
Join Date: Oct 2009
Location: Southern Illinois
Vehicle: 2009 SLK 350
Other Toys: 2012 ML350, Truck, and Tractor
Posts: 2,432
Country:
Chats: 5
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 17 Post(s)
Thanks: 1,406
Thanked 458 Times in 279 Posts
Garage
(Thread Starter)
Quote:
Originally Posted by etyu View Post
IIRC, the airconditioning button is different in earlier model year R171. As Woolly stated it is default to on (the control button will be labeled A/C OFF, so if the red LED is on, it means A/C is off) in earlier models.

Later models (R171) show only A/C. In this case a lit red LED means A/C is on, and when the LED is unlit, the A/C is off. This is on my 2008 R171.
Yep! Just like Eddy says......Challenge's AC is on when the red indicator is illuminated. Weird to me that in earlier models no light means AC on.....that is not standard design protocol for US gadgetry.

Don't think Woolly and the others would have been "gaslighting' me, but I am easily confused since reaching the advanced age of 55! However, ahhhh......I forgot!


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Gregg is offline  
#18 Old 09-21-2011
Administrator/Founding Member

 
jbanks15's Avatar
 
Join Date: Jun 2006
Location: Tampa, Florida
Vehicle: 2009 SLK 55 AMG Kleemann Supercharger, ECU tune, Headers and LSD, CF Diffuser
Posts: 91,776
Country:
Chats: 38
Mentioned: 471 Post(s)
Tagged: 5 Thread(s)
Quoted: 6546 Post(s)
Thanks: 3,246
Thanked 11,088 Times in 8,442 Posts
55? rookie!


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Jeff, US Army Master Sergeant Retired
Administrator/Founding Member
2009 SLK 55 AMG Black/Black
Kleemann Supercharger thread here:

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Kleemann ECU Tune, headers and downpipes thread here:

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Albums:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

ClearBra
OEM MB Plexiglass Draught Stop
Smarttop version 3.22
Previous - 02 SLK 320, 05 SLK 350
jbanks15 is online now  
#19 Old 09-22-2011
Premium Member
 
Join Date: Feb 2011
Location: Indy
Posts: 2,421
Country:
Chats: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 13 Post(s)
Thanks: 118
Thanked 290 Times in 244 Posts
Just to add this from my "Operator's Manual SLK-Class" on A/C;
Deactivating
It is possible to deactivate the a/c(cooling) function of the climate control sys. The air in the vehicle will then no longer be cooled or dehumidified.
> Press button [A/C rest]
The indicator lamp on the button goes out. the cooling function switched off after a short delay.

Just as Der Flieger stated

"Think as I think," said a man,"Or you are abominably wicked; You are a toad."
And after I had thought about it, I said,
"I will, then, be a toad."(Thank you, Steven Crane)

Think outside the box!
Galo is offline  
The Following User Says Thank You to Galo For This Useful Post:
Sponsored Links
Advertisement
 
Reply

  Lower Navigation
Go Back   Mercedes Benz SLK Forum > General Discussion about Mercedes Benz SLKs > General Discussion

Bookmarks

Quick Reply
Message:
Options
Upload your files to MEGAUPLOAD
Upload your images to ImageShack

Register Now



In order to be able to post messages on the Mercedes Benz SLK Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
dumb question - roll bars bobl SLK R171 General Discussion 5 06-16-2011 12:16 PM
Silly Question: Which '06 SLK350 models have Rain Sensors? amalthias2 SLK R171 General Discussion 8 11-12-2010 03:47 PM
V60 phone question, please help! oarias SLK R170 General Discussion 8 10-06-2009 06:00 PM
The next dumb question xpcdoojk SLK R171 General Discussion 1 08-14-2008 06:03 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome
 

Clubs, Garage Plus vBulletin Plugins by Drive Thru Online, Inc.