Mercedes-Benz W202 air conditioning not cooling – compressor and leaks
Why is the W202 air conditioning not cooling?
The most common cause is a refrigerant leak. Typical leak points are the compressor shaft seal, the front core of the condenser, the pressure pipe mounting point, the evaporator and the nut connections. Even a small leak empties the system in a few days.
How do I find an air conditioning leak?
Nitrogen pressure testing finds a leak better than a vacuum test, which can pull a small leak shut. With UV dye the leak is found by looking with a lamp. An empty system is not refilled until the cause of the leak has been found.
Why does the air conditioning compressor not start?
The pressure sensor prevents the compressor from starting if there is too little refrigerant. Other causes are the compressor's magnetic clutch and a detached control wire. The compressor can also spin and still be broken.
What is replaced at the same time when replacing the condenser or compressor?
The drier is always replaced at the same time, preferably just before filling, because it absorbs moisture. Automatic and semi-automatic air conditioning have their own driers. Filling should be done with air conditioning equipment.