CDti Humming Noise

cloudbase · 4th June 2021, 22:02

Hi everyone, I have 2004 conne cdti. I was doing some jobs on the car today and could hear a humming noise coming from somewhere. Ignition is off. FBH is ok, under bonnet pump is ok. I can't seem to trace where it's coming from. I thought at first it was coming from underneath the air filter housing, then closed the bonnet and listened through the grill still there. Thought it might be coming from the alternator, although the ignition is off. Has anyone come across this or any ideas, please.

trikey · 5th June 2021, 08:28

You need to listen to various areas using a stethoscope or a long screwdriver against your ear, that should highlight any strange sounds.

cloudbase · 5th June 2021, 08:57

Thanks for that. I went out this morning and the noise is still there. Strange.

MissMoppet · 5th June 2021, 11:42

Bees, possibly?

Georgies Dad · 5th June 2021, 11:44

sometimes the sat nav in the boot have been prone to staying on,could be disc whirring in that (if you have sat nav).

Lee T · 5th June 2021, 13:12

Bee's Buzz not Hum

I'm not sure you would hear the sat nav in the boot via the front grill

I would agree you are on the right track with the alternator though!
I had a Rover 800 that gave off a high pitched tone when switched off. and would drain the battery in less than 2 days if car not used. IIRC it was the diodes at fault.

4th June 2021, 22:02	#1
cloudbase Regular poster Rover 75 Saloon Join Date: Dec 2010 Location: Halesowen Posts: 37 Thanks: 0 Thanked 3 Times in 3 Posts	CDti Humming Noise Hi everyone, I have 2004 conne cdti. I was doing some jobs on the car today and could hear a humming noise coming from somewhere. Ignition is off. FBH is ok, under bonnet pump is ok. I can't seem to trace where it's coming from. I thought at first it was coming from underneath the air filter housing, then closed the bonnet and listened through the grill still there. Thought it might be coming from the alternator, although the ignition is off. Has anyone come across this or any ideas, please.

5th June 2021, 08:28	#2
trikey Premium Trader Rover 75 Join Date: Nov 2010 Location: Devon Posts: 33,772 Thanks: 8,837 Thanked 14,831 Times in 8,030 Posts	You need to listen to various areas using a stethoscope or a long screwdriver against your ear, that should highlight any strange sounds. __________________ Lest we forget..

5th June 2021, 08:57	#3
cloudbase Regular poster Rover 75 Saloon Join Date: Dec 2010 Location: Halesowen Posts: 37 Thanks: 0 Thanked 3 Times in 3 Posts	Humming Noise. Thanks for that. I went out this morning and the noise is still there. Strange.

5th June 2021, 11:42	#4
MissMoppet Posted a thing or two R 75 Tourer diesel Conny 2002, V6 Conny saloon petrol 2003 Join Date: Mar 2013 Location: Taunton Posts: 1,129 Thanks: 212 Thanked 406 Times in 223 Posts	Bees, possibly? __________________ Rover 75 Tourer Conny 2002 remapped 160 auto, R75 V6 2.5L auto Connoisseur 2003

5th June 2021, 11:44	#5
Georgies Dad This is my second home Land Rover Join Date: May 2013 Location: Thorpe St Andrew,Norwich Posts: 14,715 Thanks: 933 Thanked 2,925 Times in 1,979 Posts	sometimes the sat nav in the boot have been prone to staying on,could be disc whirring in that (if you have sat nav). __________________ Steve and Georgie Together Forever Lonely days are long Twilight sings a song All the happiness that used to be Soon my eyes will close Soon I'll find repose And in dreams, you're always near to me I'll see you in my dreams And then I'll hold you in my dreams

5th June 2021, 13:12	#6
Lee T Gets stuck in MG ZT Join Date: Jul 2014 Location: Liverpool Posts: 853 Thanks: 180 Thanked 248 Times in 189 Posts	Bee's Buzz not Hum I'm not sure you would hear the sat nav in the boot via the front grill I would agree you are on the right track with the alternator though! I had a Rover 800 that gave off a high pitched tone when switched off. and would drain the battery in less than 2 days if car not used. IIRC it was the diodes at fault. __________________ [SIGPIC][/SIGPIC]