Mercedes-Benz W639 air conditioning not cooling
W639 air conditioning is not cooling: what could be the cause?
Common causes are a refrigerant leak, wrong charge amount, a leaking condenser, the pressure switch, the compressor and the cooling fans. Measuring the pressures shows what is going on. Refrigerant work is a job for an air conditioning service.
Is the A/C charge amount wrong if the label value does not seem to work?
Overcharging gives weak cooling and high pressures, around 25 bar. The label on the car may say 850 g, but in practice a smaller amount was found to work. Make sure of the correct amount before charging.
Why does the condenser leak, and how can it be protected?
On the Vito the condenser is easily punctured when small stones fly in through the lowest air intake in the front. It is worth protecting the condenser with a mesh. The leak point is often revealed by a trace of dye.
The A/C does not cool at idle even though it has been recharged: what should I check?
Check whether the electric cooling fans are spinning. The fans may have seized during the winter even though the fuses look intact, and in that case they must be replaced.