Noise after switching off

beefchief · Oct 27th, 2018, 01:08

Hello

I notice this most at night, but I don't think it's exclusively then - just quieter environment. When I have turned my car off there's a clearly audible continuous tone coming from under the bonnet. Several times I've thought a nearby shop has had a break in - that constant "beep" tone (solid tone, not beeping, but sounds electrical to me).

I've searched through forums and haven't seen anything that describes it exactly. Any ideas?

Cheers

63 plate V40 D4 XC Lux Nav

steV50 · Oct 28th, 2018, 12:57

When I put the V40 in the garage at night and turn off the engine I have noticed a slight electrical type humming noise which lasts for a minute or so coming from under the bonnet. I think its probably just the electrical systems powering down.

GreenBrick · Oct 28th, 2018, 16:54

My Mazda 2 makes a high pitched buzz and a click a little after shut down, I think it is the throttle staying open to let the fumes out of the inlet manifold. something to do with pollution, iirc.

tomweston · Oct 31st, 2018, 12:48

My old S40 used to emit noises from under the bonnet after switch off, sounded like a quiet cow mooing, we decided that it was flaps and vents etc powering down.
My V40 D2 makes similar quieter noises sometimes when switched off in the garage after driving home from work.

Both cars use the same 1.6 diesel engine.

Oct 27th, 2018, 01:08	#1
beefchief New Member Last Online: Sep 4th, 2019 10:31 Join Date: Oct 2018 Location: Exeter	Noise after switching off Hello I notice this most at night, but I don't think it's exclusively then - just quieter environment. When I have turned my car off there's a clearly audible continuous tone coming from under the bonnet. Several times I've thought a nearby shop has had a break in - that constant "beep" tone (solid tone, not beeping, but sounds electrical to me). I've searched through forums and haven't seen anything that describes it exactly. Any ideas? Cheers 63 plate V40 D4 XC Lux Nav

Oct 28th, 2018, 16:54	#3
GreenBrick SilverBrick Lives! Last Online: Apr 5th, 2024 19:06 Join Date: Apr 2015 Location: Poynton, Cheshire	My Mazda 2 makes a high pitched buzz and a click a little after shut down, I think it is the throttle staying open to let the fumes out of the inlet manifold. something to do with pollution, iirc. __________________ Jeep ZJ, 960, Past:- Mazda2, Jumbuck, V70 (2002), 945 (1995), Hyundai Coupe, Golf Mk4, Previa, Carina, 2 x Corsa, 4 x Astra, 944 16v (1991), Espace, Escort, Audi 80, Renault 21 Savanna, Polo, Mini Clubman/Pickup, Standard 8, Capri, Maxi.

Oct 28th, 2018, 12:57	#2
steV50 Senior Member Last Online: Apr 18th, 2024 17:19 Join Date: Dec 2013 Location: Dorset	When I put the V40 in the garage at night and turn off the engine I have noticed a slight electrical type humming noise which lasts for a minute or so coming from under the bonnet. I think its probably just the electrical systems powering down.

Oct 31st, 2018, 12:48	#4
tomweston Member Last Online: Aug 26th, 2019 10:17 Join Date: Aug 2014 Location: Knutsford	My old S40 used to emit noises from under the bonnet after switch off, sounded like a quiet cow mooing, we decided that it was flaps and vents etc powering down. My V40 D2 makes similar quieter noises sometimes when switched off in the garage after driving home from work. Both cars use the same 1.6 diesel engine.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)