Air Conditioning compressor problem 2001 clk320, - Mercedes-Benz Forum
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#1 (permalink) Old 03-10-2011, 05:12 PM
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Air Conditioning compressor problem 2001 clk320,

Hi, I have had my 2001 clk320 since 2008 I am having an air conditioning problem, or lack of one, at the moment. The fan works perfect, no CEL, no EC light, but no cold air and the air compressor does not engage, at all. I just replaced the outside ambient temp sensor today and it works perfect now, (no longer -38 celcius Any Idea how to get the compressor working? It was over 84 today here in Laughlin Nevada, and will be in the 120's before too long,
Thanks guys!
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#2 (permalink) Old 03-11-2011, 04:48 AM
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A few things to consider here:

1. has your refrigerant leaked? Maybe a top-up required.
2. in-car temperature sensor B10/4 faulty
3. refrigerant pressure sensor B12 faulty
4. refrigerant temperature sensor B12/1 faulty
5. fuse f20 (15A) located in fusebox F1, block C in engine bay
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#3 (permalink) Old 03-13-2011, 12:56 AM
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Originally Posted by keyhole View Post
A few things to consider here:

1. has your refrigerant leaked? Maybe a top-up required.
2. in-car temperature sensor B10/4 faulty
3. refrigerant pressure sensor B12 faulty
4. refrigerant temperature sensor B12/1 faulty
5. fuse f20 (15A) located in fusebox F1, block C in engine bay
Hi,

I have the same problem.... yesterday morning I went to the shop to replace the defective waterpump and at the same time replace the thermostat. after the job was done, used the car twice and everything working... however after reaching home, the airconditioning was not anymore blowing cold air. check the sytem today and notice that the compressor is not engaging. However the AUTO, EC, etc buttons are working... Also I notice for the past weeks the cold air is intermitent even if the EC button is not activated.

Is there a way for me to try to reset my AC unit and verify if the compressor will engage again ? If there is can you please share...

Where can I find :
- in-car temperature sensor B10/4
- refrigerant pressure sensor B12
- refrigerant temperature sensor B12/1

Need help pls.

Thanks
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#4 (permalink) Old 03-13-2011, 12:59 AM
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Hi,

I have the same problem.... yesterday morning I went to the shop to replace the defective waterpump and at the same time replace the thermostat. after the job was done, used the car twice and everything working... however after reaching home, the airconditioning was not anymore blowing cold air. check the sytem today and notice that the compressor is not engaging. However the AUTO, EC, etc buttons are working... Also I notice for the past weeks the cold air is intermitent even if the EC button is not activated.

Is there a way for me to try to reset my AC unit and verify if the compressor will engage again ? If there is can you please share...

Where can I find :
- in-car temperature sensor B10/4
- refrigerant pressure sensor B12
- refrigerant temperature sensor B12/1

Need help pls.

Thanks
By the way... in the shop I also ask them to check on the cabin filter below the glove compartment... we check it out. .but did not replace it as they did not have the stock...so they just place back the same filter...
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#5 (permalink) Old 03-13-2011, 03:23 AM
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klaatu77 & MB-Man

There are different types of a/c unit fitted in W208/W209 CLKs. One has a display panel, and you can do a diagnostic test, which might give you a clue. See this thread here:

http://www.benzworld.org/forums/w209...help-help.html

Also, there is a 'reset' command that puts all the flaps back into the right position at start up.

I know the reset instruction is in the archives here (as I posted it recently) but right now I am away from my own PC until Thursday and I have no access to my records. Also the location of those sensors is in the WIS on my own PC. I will get back to this thread later if still required...
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#6 (permalink) Old 03-13-2011, 03:35 AM
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Follow Keyhole's advise and then post data. If gas is low can cause many issues and not provide fault codes as the compressor will shutdown using built-in sensor. Had similar problem and after replacing evaporator temp sensor and a regas, system worked perfect again. All up cost around $200.
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#7 (permalink) Old 03-13-2011, 05:16 AM
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Another recent thread on a/c problems:

http://www.benzworld.org/forums/w209...r-problem.html
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#8 (permalink) Old 03-13-2011, 06:04 AM
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I have searched like mad for the 'reset flaps' command sequence, and I just can't find it for my car. If anyone happens to know what it is for a 2001 clk (with the display panel) I would be really gratefull.

Cheers
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#9 (permalink) Old 03-13-2011, 09:08 AM
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#10 (permalink) Old 03-14-2011, 07:48 AM
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Quote:
Originally Posted by keyhole View Post
klaatu77 & MB-Man

There are different types of a/c unit fitted in W208/W209 CLKs. One has a display panel, and you can do a diagnostic test, which might give you a clue. See this thread here:

http://www.benzworld.org/forums/w209...help-help.html

Also, there is a 'reset' command that puts all the flaps back into the right position at start up.

I know the reset instruction is in the archives here (as I posted it recently) but right now I am away from my own PC until Thursday and I have no access to my records. Also the location of those sensors is in the WIS on my own PC. I will get back to this thread later if still required...
Hi Keyhole,
Thanks so much ...yes, i found the notes in the archive and below are my readings. Readings were taken after 5mins of starting the car at parked for the whole day (was not able to use the car as the aircon is not blowing cold air)

01 The in-car temperature sensor. -> 33
02 The bumper temperature sensor. -> 28
03 The temperature of the left side heater core. -> 33
04 The temperature of the right side heater core. -> 35
05 The temperature at the evaporator sensor. -57
06 The engine coolant temperature. – 72
07 The barometric pressure of the Freon. – 7
08 The Freon temperature. – 29
09 Blank. ->1
10 The voltage at the heater blower control (normal is 08-6.0, which is .8 to 6 volts). -> 4
11 Emissions sensor voltage (to detect atmospheric gases and recirculate interior air).
12 Sun sensor voltage (to shift airflow in car).
20 The current at the auxiliary fan (the electric fan on radiator, in milliamps or mA). -> 0
21 Engine speed (x 100 RPM). -> 7
22 Vehicle speed (km/h or mph depending on installation). -> 0
23 The percentage of battery voltage at terminal 58d (a percentage of total voltage, 99.0 = 99%). -> 0
24 Battery voltage (e.g. 12.8 = 12.8V). -> 14.2
40 The climate control software version. - V8 -> 5
41 The climate control hardware version. - V5 -> 3

Again do take note that did use the car and readings was taken after 5-8 mins of running the engine at idle.

Hope someone can interpret the readings.. not sure if item#5 and #7 are ok.
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