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MB Paul
MB Paul, Mercedes Technician
Category: Mercedes
Satisfied Customers: 4317
Experience:  Mercedes Benz Qualified Diagnostic Technician
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mercedes B class no gas air left in air con unit suggested

Customer Question

mercedes B class no gas air left in air con unit suggested possible diagnoses
Submitted: 3 years ago.
Category: Mercedes
Expert:  MB Paul replied 3 years ago.

In around 90% of cases the leak is from the condensor due to corrosion or stone damage to the core.

The best way to test is by pressurising the system with Nitrogen (any garage that gasses AC systems should really have this) & spraying the AC components with soapy water to check for bubbles indicating a leak.

If no leaks are found (for example a very small leak) then a leak dye is added to the system on a regas & can then be inspected using a UV lamp.

If it is the condensor then a new one from Mercedes is around £300 although EuroCarParts do one for around £100 which I have used before & is actually not too bad quality.

It is around 3 hours or so to replace & regas the system as the front bumper module needs to be remove to access the condensor.

We do sometimes see leaks from valves, pipes, compressor etc so a pressure test is required first to pinpoint the leak before any repairs are carried out.

Best regards, Paul