Update on fan noise:
Did a reset to the climate control unit following some guidance in the forums on resetting other MB models.
Driving all week and the fan noise is now normal MB quality.
Finally, I feel like I am driving an MB again.

 

Can you point me to what you did on the climate control? I have the exact issue where the fan is basically always on high when in Auto. It never goes down to lower speeds even after a long period.

If I can fix that I can then work on trying to stop some of the rattles/creaking with the plastic on the bottom of the drivers seat.

 

Turn key to start position (right before cranking engine)
Press and hold the Recirculate Air button and the Defrost button (front window) for about 10 seconds.
The fan speed will cycle.
Let go of buttons.
Turn car off then start normally.
Adjust climate control settings to your usual settings.
If this does not work search forum for "reset thermatronic"

 

Thanks, I appreciate you responding with this.

I am not sure it worked since did not go for a ride but should know tomorrow after drive to work.

 

Also check to make sure the rear center console vents are open.
Noticed that there is a dramatic noise reduction when the vents are open.

 

Thanks. I definitely have those open.

The reset did not work so I guess my next service I will have them look at this.

I do not have 3 zone AC so not sure if you do. Just Driver and Passenger with no controls in the rear set.

 

I don't have 3 zone either.
Just the vent control wheel between the vents on the backside of the center console.
Make sure it is open

 

So now the sunroof is rattling,sounds like it has become loose. I really don't want to go back to the dealer again...

 

I started a thread about noisy air-con noises a while back. This seems to be a problem across the entire W166 model range. In auto mode, the fan speed always hover around the middle of the range (4 bars) and never goes down to 1 or 2 bars. I have only ever seen it gone down to 3 bars once. Personally, I think the centre console aircon vents are way too small for the volume of air needed to keep the entire car cool, considering the large cabin space and the amount of glass area.

Although the noise from the air gushing out of the top vents drops if the air is shunted to the lower vents (e.g., when it is colder outside), this is not helpful if the ambient temperature is hot. In auto mode, all the air is shunted to the dashboard vents.

In general, you are going to have to learn to live with the high air-con noise. After manually playing with the different fan speed in hot climate, I come to the realisation that the fan speed set by the Auto mode is probably the right one at any given ambient temperature. At 1, 2 or even 3 bars, there is just insufficient air flow to keep the cabin cool on very hot day (at > 30C/86F)

On hot days, just make sure you switch on the A/C and it will help to lower the fan speed faster. Just turn up the radio a bit more to drown out the noise. Another tip I can offer is, the temperature sensor is where the courtesy light is located in the roof top binnacle, if you can clear away the hot air floating at the top of the car, you are likely to enjoy a quieter ride. Opening the windows and/or the sunroof helps exhaust the hot air out of the car.

When I took the car in the service, my loan car was the newest C250. Interestingly, the fan speed on that car in Auto mode also stay at 4 bars, although there is no where near as much air gushing noise. (on the other hand, the C-class is slightly noisier than ML class)

I also want to report that, out of the blue, I suddenly notice a creaking sound under the driver seat, and it is noticeable during braking or cornering. After much investigation, I suspect it is due to something in the left side cushion - I got a RHD version - the noise could be reproduced when I lean forward and back in the driver's seat. Massaging the cushion at its base seems to reduce the noise.

 

Got the car back from dealer after another week long visit. That is 2 week long visits in 6 months.
Now the sunroof tracks were replaced. Hopefully that will do the trick and stop the noisel

 

I am using Rainx for long on my C350 and now on ML350, never expirienced any issue. Buying MB washing fluid is way too expensive, I am sure RainX would go out of bussiness if they cause issues with expensive cars. Not sure about this issue...

 

Mine is ratteling a bit when shield is open, I will go MB on this too. Sounds like known issue, is yours panoramic or regular sunroof? Mine is regular.

 

Hate to say it but there is a problem with some kinds of washer fluid 'corroding' up the sensor in the reservoir of the newer MB's. Flushing the reservoir with the $$ MB ***** will clean up the issue. Not suggesting you use the expensive stuff, just try another brand if you have trouble. There was a thread awhile back on this exact issue.

 

Can you be a bit more specific? Which thread, who complained besides you? Which brand is causing issue and which is not? You are not suggesting yo use MB fluid and after this flushing with MB ...? How flushing will help?

 

1st... calm down! scheech, 10 questions...! Do a search(this forum) on "washer fluid"... You'll find at least 20 threads on this issue, and some specifically with using RainX.

 

I knew I'd read a more detailed problem with Rainx... It was in the S class forum, complete with pics.
https://mbworld.org/forums/s-class-w...voir-full.html

 

I drained remained rainex and filled with blue, thanks! I am not going to buy MB expensive fluid for that price they are asking ...

 

So its been 9 months since I took delivery of this 2015 ML 350.
- The car has been in the shop for 3 weeks now.
- Sunroof frame was replaced in June and then the sunroof was sitting a little lower than the roof. No more excessive wind noise but I notice water pooling on the sunroof.
- Took the car in for its first service at around 9,500 miles and asked them to check on the roof again.
- Told that they need to replace a bracket to adjust the sunroof properly. Then told that the sunroof drain is not working properly and that is causing the pooling of water. Apparently the drain hose is not draining but they don't know why. To make matters worse, the A-pillar is factory filled with spray foam insulation for sound deadening and they can't get the hose out.
- 3 weeks later, the car is still in shop because they can't replace the drain hose.
- Still loving the 2016 E350 loaner the dealer provided but where is my car?
- Multiple calls to MBUSA with no resolution. How do you say Lemon in German?
- If MBUSA doesn't step up, this is the end of Mercedes for me.

 

Every brand has crappy stories. Save yourself the increase in blood pressure by holding a grudge and buy what you like best.

 

After 1 month in shop.
Car is back and everything is as it should be for now.

 

This car drives so nicely but seriously what is up with all of these stupid problems. So I have been using the German washer fluid stuff religiously and everything was good. Now, I get the check washer fluid level warning. So I add some more of the German special stuff. but the fluid bottle is almost full. Regardless, I fill the bottle to the top of the filler neck. On start-up the warning is still there. Press the "OK" button on the steering wheel and the message goes away. No warnings stored in the messages menu. Next time I go to start the car and the message is back again. Repeat the same process to clear, and it keeps coming back on start-up. So is it safe to say that the lousy $10 sensor is no good?

BTW, the climate control fan is still hunting for the right speed. Really annoying for a $60,000 German vehicle.