Air conditioning issue

alexhpilot · 07-29-2021, 01:48 AM

Dear all,

I have a 2016 640d with around 35,000 miles on the clock. In very good working order, however, there seems to be a subtle issue with the air conditioning unit.
Whenever this is turned on it sounds like it is surging whenever the accelerator is pressed. Sounds like a powerful fan. Doesn't affect the cool air and the unit seems to work. The noise is not normal though. Noise is not there when AC is turned off.
Anyone else had this issue or know what the problem might be? It is going to BMW next week.

Bluefoz · 07-29-2021, 08:36 AM

Hi,
Coincidentally I bought my 640d GC a month ago as an Approved Used car and it's booked in under warranty on Monday for exactly the same issue. AC off it ticks over as it should, turn it on, the AC works fine but the additional load produces a whine - not particularly loud but certainly loud enough to be annoying and definitiely loud enough for it not to be right. I'm thinking tensioner pulley or the like on the auxiliary belt, but that's for them to diagnose! 2017 and 22k BTW

I'll let you know the outcome....

alexhpilot · 03-22-2023, 09:36 AM

Apologies. Was meaning to reply to this some time ago.
Faulty AC unit. Entire thing had to be replaced. Happy it was under warranty to say the least.

07-29-2021, 01:48 AM	#1
alexhpilot Registered 0 Rep 3 Posts Drives: BMW 640d Join Date: Jul 2021 Location: London iTrader: (0)	Air conditioning issue Dear all, I have a 2016 640d with around 35,000 miles on the clock. In very good working order, however, there seems to be a subtle issue with the air conditioning unit. Whenever this is turned on it sounds like it is surging whenever the accelerator is pressed. Sounds like a powerful fan. Doesn't affect the cool air and the unit seems to work. The noise is not normal though. Noise is not there when AC is turned off. Anyone else had this issue or know what the problem might be? It is going to BMW next week.
	Appreciate 0 Tweet Quote

07-29-2021, 08:36 AM	#2
Bluefoz Private 29 Rep 57 Posts Drives: 640d GC Ltd Ed., iX3 Pro Join Date: Jan 2018 Location: Warwickshire iTrader: (0)	Hi, Coincidentally I bought my 640d GC a month ago as an Approved Used car and it's booked in under warranty on Monday for exactly the same issue. AC off it ticks over as it should, turn it on, the AC works fine but the additional load produces a whine - not particularly loud but certainly loud enough to be annoying and definitiely loud enough for it not to be right. I'm thinking tensioner pulley or the like on the auxiliary belt, but that's for them to diagnose! 2017 and 22k BTW I'll let you know the outcome.... Last edited by Bluefoz; 07-29-2021 at 03:02 PM.. Reason: additional info
	Appreciate 0 Quote

03-22-2023, 09:36 AM	#3
alexhpilot Registered 0 Rep 3 Posts Drives: BMW 640d Join Date: Jul 2021 Location: London iTrader: (0)	Apologies. Was meaning to reply to this some time ago. Faulty AC unit. Entire thing had to be replaced. Happy it was under warranty to say the least.
	Appreciate 0 Quote