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  #16  
Old 5th January 2020, 11:41 AM
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Michel Michel is offline
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Default Re: Air Con mystery

Maybe earlier cars donít suffer from that problem?

My 2000 CLK430 get freezing cold air out of the outlets in les than one minute!
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  #17  
Old 5th January 2020, 03:03 PM
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Default Re: Air Con mystery

Most modern climate control systems will not blow air into the cabin when first started. Instead, they will circulate the air within the system until it achieves the desired temperature before opening the vent into the cabin. Could this be part of your issue Sean?
The ML is a manual system and just blows air at whatever temperature until it cools (as Michel reports; in less than a minute). All my aircon systems run at about 7 C output at the main vent. Have you checked the temperature of the air at output Sean?
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  #18  
Old 7th January 2020, 06:38 AM
sean sherry sean sherry is offline
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Question Re: Air Con mystery

Yes Michel and Brian are both right..... being too clever by half can breed it's own problems. It seems that the Compressor is not doing its job for 5/10 minutes. There is a Compressor Control Valve which may be the culprit , It is electronic so it could also be a power supply problem which comes from the front SAM unit via a control somewhere.
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  #19  
Old 7th January 2020, 08:06 AM
sean sherry sean sherry is offline
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Thumbs down Re: Air Con mystery

Still a mystery... this morning with temp. at 22% the air Con came on after about 20 seconds. ..... On when I don't need it !!!
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  #20  
Old 7th January 2020, 09:45 AM
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Default Re: Air Con mystery

It's removing humidity.
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  #21  
Old 7th January 2020, 10:35 AM
sean sherry sean sherry is offline
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Smile Re: Air Con mystery

Mercedes today confirmed that the Compressor Valve is only available with a new Compressor $1500..... Their Tech. also said that in many cases it is a guessing game to find the cause... many sensors that do not flag a fault !!
Back to learning to live with it... not the end of the World.
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  #22  
Old 8th January 2020, 10:34 AM
sean sherry sean sherry is offline
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Smile Re: Air Con mystery

Scouring the internet... no one has come up with a definitive answer. Some have spent big $$ with the Dealers mostly in the States.
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  #23  
Old 8th January 2020, 12:50 PM
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Default Re: Air Con mystery

Quote:
Originally Posted by sean sherry View Post
Still a mystery... this morning with temp. at 22% the air Con came on after about 20 seconds. ..... On when I don't need it !!!
It seems to take longer, the hotter it is.
I always had the theory there is some kind of sensor that waits until It thinks it can blow very cold before it lets the air through. As the systems age, and perhaps no longer have a full charge of freon, this takes longer. I prefer the older method where it doesn't hold it back.

No scientific basis to my theory though.
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  #24  
Old 8th January 2020, 07:31 PM
sean sherry sean sherry is offline
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Smile Re: Air Con mystery

Yes Bryce, that fits in with the comments the Mercedes Tech made as to multiple Sensors complicating these systems.
I always think Brian....." Real men drive manuals "
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  #25  
Old 16th January 2020, 04:18 PM
sean sherry sean sherry is offline
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Thumbs up Re: Air Con mystery

Now behaving itself this past week ?? All I did was to switch the Air on and off a dozen times to perhaps wake up the electronic Control Valve on the Compressor
Maybe this did something or maybe the system just decided to function. Though I am aware that, as Ant said, that the system is just sorting itself out before letting Cold Air through to the Cabin in high Ambient Temp. and Humidity.

P.S. it has taken me a year to sort out all the phobiles , now Car Drives as the makers and designers intended.
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