C-Class (W202) 1995-2000: C 200 CDI, C 220 CDI, C 270 CDI, C 180, C 200 K,C 230 K, C 220, C230, C 280

Air conditioner question

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Old May 25, 2020 | 04:20 PM
  #1  
C-220Guy's Avatar
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C-220
Air conditioner question

I have a mb c-220, 1995
when I have the a/c on ( driving or not )
the cold air comes out as the exact temperature I want
but
at some given time, the temperature drops buy
~ 3 degrees ?
then I turn off the a/c, then the engine
wait for 2 minutes then
turn on engine, then a/c and all of a sudden the temp
comes out at my original cold setting
freon is good, pressure is good, no leaks in the system
any ideas ?

thank you
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Old May 25, 2020 | 06:04 PM
  #2  
C-220Guy's Avatar
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C-220
Air conditioning reply

Bucket ?
i have 879.537.00 miles on this car
i keep it in its original condition
all scheduled maintenance
I belong to the Mercedes club of American
All my technicians are factory certified
Holiday is here so their on vacation
but if you say the variance is not an issue, then I’ll
go with your word

thank you
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Old May 25, 2020 | 07:20 PM
  #3  
ihaveaquestion's Avatar
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2000 C230 Kompressor
The most likely culprits are the blower, AC control unit....etc.

AC has been a known issue among W202.
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Old May 25, 2020 | 07:54 PM
  #4  
khomer2's Avatar
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From: Westcoast/Interior
02w163ML500 / 97w210E50AMG / 99w202C230k / 95w124500e-wip
Originally Posted by C-220Guy
Bucket ?
i have 879.537.00 miles on this car
i keep it in its original condition
all scheduled maintenance
I belong to the Mercedes club of American
All my technicians are factory certified
Holiday is here so their on vacation
but if you say the variance is not an issue, then I’ll
go with your word

thank you
Dont take it personally. All of the stricken items above are irrelevant.
Perhaps your "bucket" is having a bad day.
Enjoy your Memorial Day.
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Old May 25, 2020 | 08:24 PM
  #5  
C-220Guy's Avatar
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C-220
Air conditioning question

Is it possible that the “ firmware “ on the A/C control module may need to be inspected and possibly upgraded ?
Something the dealer has a partial monopoly yet
well versed independently operated mb shop
would have this in their arsenal ?
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Old May 25, 2020 | 08:34 PM
  #6  
khomer2's Avatar
MBWorld Fanatic!
 
Joined: Nov 2015
Posts: 1,456
Likes: 140
From: Westcoast/Interior
02w163ML500 / 97w210E50AMG / 99w202C230k / 95w124500e-wip
Originally Posted by C-220Guy
Is it possible that the “ firmware “ on the A/C control module may need to be inspected and possibly upgraded ?
Something the dealer has a partial monopoly yet
well versed independently operated mb shop
would have this in their arsenal ?
Firmware on the AC controller unit. I dont recall 1995 having digital modules (I could be wrong) and never heard of firmware upgrade for these era AC controllers.
Could be even with all your TLC, the motor brushes are wearing out. (Just hunch, as these "buckets" have plenty of hardware that breaks down thru natural process, over time and use.)
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