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Humming sound when switching off
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CJS
 


Member Since: 02 Nov 2006
Location: East Lothian
Posts: 62

Scotland 2014 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4
Humming sound when switching off

When I switch off I hear a humming sound both inside and outside. After a few minutes it stops. Is this something to do with the colder weather we are getting? Is it normal?  
Post #983962nd Nov 2006 9:34 pm
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Gareth
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Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26702

United Kingdom 

Its the Webasto supplemental heater winding down. Its the box thing with the mini exhaust, behind the left headlamp under the bonnet.

Do a search for FBH or Webasto, there is lots of history on this one!  
Post #984002nd Nov 2006 9:48 pm
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CJS
 


Member Since: 02 Nov 2006
Location: East Lothian
Posts: 62

Scotland 2014 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4
Humming sound when switching off

Thanks a lot. What you say makes sense. I just asked a friend of mine, who also has an HSE, if he had a similar problem and he said 'no' but then he also confirmed he never puts any form of heat on or the air con!!  
Post #984122nd Nov 2006 10:18 pm
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Gareth
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Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26702

United Kingdom 

The FBH will fire up if the air temp is 5 or below and the engine is 75 degrees or below. It is fully automatic. Whether or not you use the air con or heating has no bearing on the FBH.  
Post #984142nd Nov 2006 10:27 pm
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CJS
 


Member Since: 02 Nov 2006
Location: East Lothian
Posts: 62

Scotland 2014 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4
Humming sound when switching off

I didn't realise that. I cannot understand why my friend hasn't heard it then.

Thanks for your help.  
Post #984242nd Nov 2006 10:39 pm
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Winger
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Member Since: 15 Feb 2005
Location: UK
Posts: 3428

2016 Discovery 4 3.0 TDV6 HSE Auto Aintree GreenDiscovery 4

If this is a humming after you've been driving and tha engine is at normal operating temperature it isn't the FBH purging itself. Sounds more like the high pressure systems shutting down.

Either way, nothing to worry about.  
Post #984262nd Nov 2006 10:40 pm
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bobbycrispbox
 


Member Since: 15 May 2006
Location: Where women glow and men plunder
Posts: 2580

Australia 

How long does it take for the FBH to kick off? This morning I sat in my car for a couple of minutes after starting the engine to look for the telltale smoke, but I didn't see any sign. I think outside temp was 1 or 2.  
Post #984272nd Nov 2006 10:43 pm
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Gareth
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Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26702

United Kingdom 

It takes about a minute to show. If you were low on fuel (warning lamp on) it inhibits the FBH.  
Post #984302nd Nov 2006 10:49 pm
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Winger
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Member Since: 15 Feb 2005
Location: UK
Posts: 3428

2016 Discovery 4 3.0 TDV6 HSE Auto Aintree GreenDiscovery 4

It doesn't smoke very much; you can hear it working clearly, though. It starts instantly assuming the parameters are right.  
Post #984312nd Nov 2006 10:49 pm
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lee01277
 


Member Since: 06 May 2005
Location: Shed
Posts: 821

United Kingdom 2005 Discovery 3 TDV6 S Auto Zambezi SilverDiscovery 3

or the fridge in the cubby box ? ..............Somewhere in-between my old D3 and what's to come next .........  
Post #986993rd Nov 2006 8:58 pm
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Pelyma
  


Member Since: 06 Jan 2005
Location: Patching, Sussex
Posts: 15496

England 

lee01277 wrote:
or the fridge in the cubby box ?


No that doesn't smoke Wink DS3 TDV6 HSE - Silver with Alpaca (old one) Gone
DS3 TDV6 HSE- Silver with Alpaca (new one) Gone
D4 HSE Lux - Montalcino Red Gone
Porsche Cayenne V8 Diesel S  
Post #987093rd Nov 2006 9:33 pm
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