A/C noise in 435i

MH94 · 09-30-2019, 05:30 AM

Hi all I recently bought an approved used 435i I love the car apart from the mpg

aside from that I have annoying whining noise coming from the aircon when I slow down between 2000rpm to idle and stops as soon as I turn off the A/C weirdly when I first start the car and drive off all is well but as soon as I have been over the 2000/2500rpm mark the noise starts again, I will eventually take it in to the dealer but time is very limited at the moment with work so thought I'd check to see if anyone has experience it before and has a fix for it ?

Thanks Matt.

Alscoob · 09-30-2019, 07:28 AM

Sounds similar to the noise I had in my last F31. It's the compressor.

I booked it in for an A/C regas and service, the independent said the system was low and added an extra drop of lubricant in with the refrigerant on refill and was quiet as a mouse after.

MH94 · 09-30-2019, 09:55 AM

Thanks for the reply I might ring and see what they say, when I turn the A/C on I can hear a rush of gas which I've never heard on other cars so maybe it is just low and needs topping up

Thanks Matt.

09-30-2019, 05:30 AM	#1
MH94 Private First Class 22 Rep 104 Posts Drives: BMW F30 Join Date: Sep 2018 Location: London iTrader: (0)	A/C noise in 435i Hi all I recently bought an approved used 435i I love the car apart from the mpg aside from that I have annoying whining noise coming from the aircon when I slow down between 2000rpm to idle and stops as soon as I turn off the A/C weirdly when I first start the car and drive off all is well but as soon as I have been over the 2000/2500rpm mark the noise starts again, I will eventually take it in to the dealer but time is very limited at the moment with work so thought I'd check to see if anyone has experience it before and has a fix for it ? Thanks Matt.
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09-30-2019, 07:28 AM	#2
Alscoob Brigadier General 2119 Rep 3,066 Posts Drives: G31 540i M Sport Edition Join Date: Jun 2015 Location: UK iTrader: (0)	Sounds similar to the noise I had in my last F31. It's the compressor. I booked it in for an A/C regas and service, the independent said the system was low and added an extra drop of lubricant in with the refrigerant on refill and was quiet as a mouse after.
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09-30-2019, 09:55 AM	#3
MH94 Private First Class 22 Rep 104 Posts Drives: BMW F30 Join Date: Sep 2018 Location: London iTrader: (0)	Thanks for the reply I might ring and see what they say, when I turn the A/C on I can hear a rush of gas which I've never heard on other cars so maybe it is just low and needs topping up Thanks Matt.
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