That seems excessively long, but my '15 GL550 makes all sorts of whirring and buzzing noises for a bit when I turn it off (or when I walk near it when it's off with the key in my pocket).

Bill

 

I think the whirring/buzzing noises when you approach the car with the key is normal because the car is communicating with the keyless go. However, the buzzing noise I have (around the ABS control module area) is only happened after turning off the engine after a ride. It lasts for about 3-5 minutes. I just wonder if this is a normal behavior or something that I need to take to a dealership to check out.

thanks everyone for advises.

 

My 2014 GL550 does this as well. I bought it used, so not sure if it's normal. If I start the engine again, and then shut it off a second time...the noise goes away.

 

Since it's still under warranty, I'm going to the dealership this Friday to see what they will say about it. I'll post the result when I found it.

 

Thanks! That would be good information to share. I'm worried that it might be a costly repair!!

 

 

Thank you for the information! Makes me feel a little more confident driving it. Did they say exactly what is making the noise?

 

 

Sounds like the water pump. Mine does it, too. The length of time depends on how hot the engine is.

 

Can't claim it is normal or even typical, but our 2015 GL550 is whistling, blowing or hissing whenever it is off. The air suspension goes first as it settles the suspension, then fans start blowing and there are miscellaneous noises most of the time ... even until the next day when we restart and the process repeats. Part of the problem is that the car is in an insulated garage that only parks one car so it is easy to hear every noise.

Whenever we open a door we hear a fan blowing, but it stops immediately. If we park with side windows open it is very obvious through the window opening. As it is almost its "fourth birthday" and we're still on the original battery it can't be too big a problem, right?