How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site. Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Matt Your Own Question
Matt
Matt, Mechanical Engineer
Category: Mercedes
Satisfied Customers: 22005
Experience:  BEng hons Mech engineering, in auto industry 22 years
12772297
Type Your Mercedes Question Here...
Matt is online now

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: 3 years ago.
Category: Mercedes
Expert:  Shantal-Mod replied 3 years ago.
Hello,
I'm Shantal and I'm a moderator for this topic.
I've been working hard to find a Professional to assist you with your question, but sometimes finding the right Professional can take a little longer than expected.
I was checking to see if you had already found your answer or if you still need assistance from one of the Professionals.
Please let me know if you wish to continue waiting or if you would like for us to close your question?
Thank you,
Shantal
Customer: replied 3 years ago.

I wish to wait

Expert:  Matt replied 3 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: 22005
Experience: BEng hons Mech engineering, in auto industry 22 years
Matt and other Mercedes Specialists are ready to help you