strange electric noise from under the bonnet

t4murvi · Sep 24th, 2017, 20:32

when I unlocked the car (engine cold), it started making a noise like an electric fan under the bonnet. Front right, can't see anything. Just been out, having left it a few hours, and it sounds like a ticking noise now...
I know the alarm is in that corner, and I removed the fuse a few weeks back, as it was going off all the time. Could it be related?

ShadeTek · Sep 24th, 2017, 20:46

More than likely it is the brake vacuum pump running. Does it run for a few seconds then go off? If so, nothing to worry about.

t4murvi · Sep 24th, 2017, 20:52

No it seems to be running for 5-10 minutes at least.
I tried putting the fuse back in for the alarm. That made the noise different, sort of louder at first, but then it seems to go away, but still ticking a bit. I've left the fuse in to see what happens...

Brendan W · Sep 24th, 2017, 21:01

When the alarm siren goes it can make all sorts of peculiar noises seeming to come from the ecu box/ washer reservoir area. Even with the fuse removed the leaky battery can have enough charge to continue the noises.

Das boot · Sep 24th, 2017, 21:08

Mine did this for a while , it was the headlight wipers trying and failing to park themselves. Try pulling the appropriate fuse to see if the noise stops.

oragex · Sep 24th, 2017, 22:43

May well be a melted alarm siren module. It still has a battery (or what's remaining) to power it. Stick an ear on the fender see.

The brake booster pump is low under the air filter assembly. Easy to spot if it's running.

On front right side there is a small cooling fan inside a tube between the ECM black box and the p/s reservoir.

Jools99 · Sep 26th, 2017, 14:34

Murvi,

have a look at this post and see if it helps

https://www.volvoforums.org.uk/showt...ighlight=noise

cheers
Jools

Sep 24th, 2017, 20:32	#1
t4murvi New Member Last Online: Dec 18th, 2023 12:59 Join Date: May 2015 Location: Abingdon	strange electric noise from under the bonnet when I unlocked the car (engine cold), it started making a noise like an electric fan under the bonnet. Front right, can't see anything. Just been out, having left it a few hours, and it sounds like a ticking noise now... I know the alarm is in that corner, and I removed the fuse a few weeks back, as it was going off all the time. Could it be related?

Sep 24th, 2017, 20:46	#2
ShadeTek Premier Member Last Online: Apr 9th, 2024 19:03 Join Date: Dec 2002 Location: Renfrewshire View Photos By: ShadeTek	More than likely it is the brake vacuum pump running. Does it run for a few seconds then go off? If so, nothing to worry about. __________________ Tek-Emo Villis Emo Bis V70 SE NAV 1.6 D2 2015MY POWERSHIFT, D4162T, 86000miles, RED. /VOL FCR/PEPER OBD2/Acron 9135 OBD2/L.E.D Flasher/VDASH/ANCEL BA301

Sep 24th, 2017, 22:43	#6
oragex Premier Member Last Online: Jul 26th, 2021 21:24 Join Date: Jun 2013 Location: Coldnada	May well be a melted alarm siren module. It still has a battery (or what's remaining) to power it. Stick an ear on the fender see. The brake booster pump is low under the air filter assembly. Easy to spot if it's running. On front right side there is a small cooling fan inside a tube between the ECM black box and the p/s reservoir. __________________ Several Volvo Repair Videos https://www.youtube.com/playlist?lis...ECTts0FSVSOT_c Last edited by oragex; Sep 24th, 2017 at 22:46.

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Sep 24th, 2017, 20:52	#3
t4murvi New Member Last Online: Dec 18th, 2023 12:59 Join Date: May 2015 Location: Abingdon	No it seems to be running for 5-10 minutes at least. I tried putting the fuse back in for the alarm. That made the noise different, sort of louder at first, but then it seems to go away, but still ticking a bit. I've left the fuse in to see what happens...

Sep 24th, 2017, 21:01	#4
Brendan W Premier Member Last Online: Apr 2nd, 2024 19:50 Join Date: Dec 2007 Location: Wexford	When the alarm siren goes it can make all sorts of peculiar noises seeming to come from the ecu box/ washer reservoir area. Even with the fuse removed the leaky battery can have enough charge to continue the noises.

Sep 24th, 2017, 21:08	#5
Das boot Premier Member Last Online: Apr 25th, 2019 14:15 Join Date: Aug 2017 Location: Hamburg	Mine did this for a while , it was the headlight wipers trying and failing to park themselves. Try pulling the appropriate fuse to see if the noise stops.

Sep 26th, 2017, 14:34	#7
Jools99 Junior Member Last Online: Mar 22nd, 2024 03:42 Join Date: Nov 2011 Location: Yeovil	Murvi, have a look at this post and see if it helps https://www.volvoforums.org.uk/showt...ighlight=noise cheers Jools

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