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Matt
Matt, Mechanical Engineer
Category: Mercedes
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Experience:  BEng hons Mech engineering, in auto industry 22 years
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clc 220 cdi aircon starts to blow warm air while on cold setting.

Resolved Question:

clc 220 cdi aircon starts to blow warm air while on cold setting. I turn on a/c with a/c button but it wont turn off with button I have to turn all system off with fan dial then turn on and a/c off. press a/c button again a/c comes on and wont turn off again. help appreciated
Submitted: 2 years ago.
Category: Mercedes
Expert:  Shantal-Mod replied 2 years ago.
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Customer: replied 2 years ago.

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Expert:  Matt replied 2 years ago.
Hello

 

1st thing to check is that the AC rad / condenser is clear of any debris and there's nothing in front of the air flow to it, next ensure that the AC pump drive belt isn't slipping and if any doubt replace it.

 

Also check that if there's a pollen filter to the cabin air inlet that this is clean and free flowing

 

Next you can test components simply by checking the temperatures by touching them with the system running. with the engine at operating temperature and the AC turned on it should be as follows:

 

A hot compressor / pump

 

A hot high pressure refrigerant line from the compressor to the condenser

 

A hot condenser on the inlet

 

A warm condenser on the outlet

 

A warm liquid line from the condenser to the evaporator (before the expansion valve or orifice tube)

 

A cold evaporator outlet line

 

A cold low pressure refrigerant line to the compressor

 

If you get a different result from the above then suspect a blockage in the line or the component whose temperature is abnormal, this can be confirmed with a pressure test Then if you're happy the temperature control is OK ( does it do hot as well as cold?) I'd take the car to an garage that can read the pressure levels of the system so the level of gas can be checked hopefully all it needs is a re-gas
Matt, Mechanical Engineer
Category: Mercedes
Satisfied Customers: 21370
Experience: BEng hons Mech engineering, in auto industry 22 years
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