thug_law

We were going to Las Vegas from Los Angeles couple weeks ago. We passed Barstow when the rear vents started blowing hot air. The front vents were ok. It was about 101 degrees outside.
We turned-off the car on I-10 E to restart the computer to see if it will fix itself; but the problem still existed. However, on our way back from Vegas we did not experience this. I'm afraid on the next long trip it will happen again.
Anyone with the same problem? It's ok now, should I take it to the dealer?

DWP

No solution, just the same (or similar) problem:

https://mbworld.org/forums/e-class-w211/77610-problem-4-zone-climate-control.html

abhansali

Do either of you guys have a really loud fan? If the car is on and then you stand outside is it so loud, you almost have to scream to talk over it? My fan seems to be getting very loud. Dealership said it was normal, the fans are very loud....any thoughts.

marksatex

Mine sounds like a turbine. Really loud, and whines when slowing. Dealer says all is as should be .

GDawgC220

the fans are normal. Those are the AUX fans that kick on when the car's temp reaches a certain point and then the fans blow in extra air to keep the engine cooler. Unfortunately, it is loud, but better than the engine overheating

SUNILP

my 320's fan is very loud too when outer temps are around 100 degrees. Same thing on CLK's. I think it is very normal. Sounds like a prop from an airplane.