Originally Posted by johnamoss
Katjek, I don't think that was what he was saying. You may want to read again.
I understood he refused changing the compressor but I'm clearly too simple to follow the exact cause of the problem.
I have not had a problem like this but it was previously mentioned that low freon (R134a) would result to the issue of cold only on the other side. On the other hand, the evaporator is common, even on a 4-zone W211 system. I cannot understand how it could then make only the other side cold.
Fescudder clearly had low freon but also some hoses fixed. Looking at the W210 air hoses
I assume it would not blow hot air but instead would not blow at all on the driver's side when it gets hot?
A/C normally blows mainly from the upper nozzles, cool air goes downwards anyway. When the driver side is hot, does it blow cold from the centre and the passenger side?
Where was it actually leaking freon if not from the compressor (and the compressor was not serviced?). Was that fixed or was it just some "normal freon leakage" that happens all the time and does not need service but just fill up after some years of usage?
On the hissing sound, the evaporator by default makes some hissing sound when the liquid freon evaporates to gas. I have to say I don't remember noticing that from my current cars but it just has to be attenuated efficiently, probably detectable when switching off engine and blower, for a while when the system still has freon pressure (or perhaps even this is electronically switched off today).