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DISCO3.CO.UK > Webasto Fuel Burning Heater

No wonder my fuel economy is bad FBH on constant
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furnitureman
 


Member Since: 30 Apr 2015
Location: Stoney Stanton, Leicestershire
Posts: 1529

United Kingdom 2006 Discovery 3 TDV6 HSE Auto Lugano TealDiscovery 3
No wonder my fuel economy is bad FBH on constant

Ive just realized that my FBH is on all the time i got to a customers after a 1 hr drive car nice and warm and after turning off and getting out of car i heard the FBH shutting down, i then drove home 1hr same thing, i got in car drove to drop eldest off at work got home and FBH on, turned off went inside came out 5 mins later started car with iid connected and FBH glow plug on then fuel pump and then it started.

Why is this happening is there anything i can do via iid to sort this or just turn it off
 Range Rover Westminster 4.4 TDV8 what a car
Discovery 3 HSE 2006 gone but never forgotten
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Post #17309938th Nov 2016 5:05 pm
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Martin
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Member Since: 06 Nov 2004
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United Kingdom 2006 Discovery 3 TDV6 SE Manual Buckingham BlueDiscovery 3

If you don't want it then remove Fuse 28 as per here http://www.disco3.co.uk/wiki/Fuel_Burning_Heater#Resetting

or disconnect the FBH power connector.
 06 D3 SE / 15 LR D90 XS SW / 88 LR 90 Td5 / 68 BMW 2000 ti
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Post #17309958th Nov 2016 5:08 pm
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furnitureman
 


Member Since: 30 Apr 2015
Location: Stoney Stanton, Leicestershire
Posts: 1529

United Kingdom 2006 Discovery 3 TDV6 HSE Auto Lugano TealDiscovery 3

its nice to have it for pre heating but not on all the time im just trying to see if anyone has had this happen to them and if so how to fix
 Range Rover Westminster 4.4 TDV8 what a car
Discovery 3 HSE 2006 gone but never forgotten
Member of the 234,567 mile club😎
 
 
Post #17309968th Nov 2016 5:10 pm
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Martin
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Member Since: 06 Nov 2004
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United Kingdom 2006 Discovery 3 TDV6 SE Manual Buckingham BlueDiscovery 3

It runs automatically based on coolant temperature. It is two-stage so it goes into half-power mode. So it's probably not using as much as you think.

At full power it uses 0.60 litres per hour, at half power 0.35 litres per hour.

Assuming you travel down the motorway for an hour at 70mph at 27.0mpg, that's 2.6 gallons or 11.8 litres. The extra 0.6 litres (worst case, full power all the time) would change your fuel consumption to 25.7mpg
 06 D3 SE / 15 LR D90 XS SW / 88 LR 90 Td5 / 68 BMW 2000 ti
Any issues with the site let me know! 
 
Post #17310048th Nov 2016 5:19 pm
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riverblanche
 


Member Since: 31 Aug 2010
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England 2008 Discovery 3 TDV6 HSE Auto Java BlackDiscovery 3

Hi,
worth checking your thermostat as well Thumbs Up
friends car was running the fbh after we had travelled over an hour but driving very steady through a forest Shocked
thermostat stuck open.
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Post #17310098th Nov 2016 5:25 pm
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furnitureman
 


Member Since: 30 Apr 2015
Location: Stoney Stanton, Leicestershire
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United Kingdom 2006 Discovery 3 TDV6 HSE Auto Lugano TealDiscovery 3

Thanks for the info Martin prob not as bad as i though then must be my lead right foot to blame Rolling with laughter
 Range Rover Westminster 4.4 TDV8 what a car
Discovery 3 HSE 2006 gone but never forgotten
Member of the 234,567 mile club😎
 
 
Post #17310308th Nov 2016 5:54 pm
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Flack
 


Member Since: 06 Sep 2006
Location: Preston Lancashire
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England 2007 Discovery 3 TDV6 XS Auto Stornoway GreyDiscovery 3

In these temps around 5c and below it will run 95% of the time, its designed that way, nothing wrong with it.


Flack Thumbs Up
  
Post #17310338th Nov 2016 6:00 pm
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furnitureman
 


Member Since: 30 Apr 2015
Location: Stoney Stanton, Leicestershire
Posts: 1529

United Kingdom 2006 Discovery 3 TDV6 HSE Auto Lugano TealDiscovery 3

Thumbs Up
 Range Rover Westminster 4.4 TDV8 what a car
Discovery 3 HSE 2006 gone but never forgotten
Member of the 234,567 mile club😎
 
 
Post #17310368th Nov 2016 6:08 pm
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L319
 


Member Since: 14 Dec 2013
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United Kingdom 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

Surely by keeping the engine temperature up that helps improve the fuel consumption.
  
Post #17310418th Nov 2016 6:18 pm
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Robbie
 


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United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

Indeed it does.

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Post #17311508th Nov 2016 8:43 pm
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aman
 


Member Since: 09 Feb 2014
Location: London
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United Kingdom 2005 Discovery 3 TDV6 SE Auto Java BlackDiscovery 3

I had the same issue.
3 degrees outside. FBH always on. Radiator fan coming on and off.
Turned interior heating to max and watched the temperature gauge on the dash go down... so I'm guessing that's a faulty thermostat?
  
Post #176738022nd Jan 2017 6:18 pm
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anglefire
 


Member Since: 09 Mar 2010
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England 

On a decent run (i.e. Not round town) in the cold I'm still averaging high 20's with a fully functional FBH. It's actually better than previous years as I sorted my very very slightly binding brakes last year (actually master cylinder/servo issue).
 Mark.
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Post #176740322nd Jan 2017 6:56 pm
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Flack
 


Member Since: 06 Sep 2006
Location: Preston Lancashire
Posts: 6312

England 2007 Discovery 3 TDV6 XS Auto Stornoway GreyDiscovery 3

Quote:
I had the same issue.
3 degrees outside. FBH always on. Radiator fan coming on and off.
Turned interior heating to max and watched the temperature gauge on the dash go down... so I'm guessing that's a faulty thermostat?


No thats normal, if you are blowing to max in the car it will have a cooling effect on the coolent temp..


Flack Thumbs Up
  
Post #176741222nd Jan 2017 7:17 pm
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aman
 


Member Since: 09 Feb 2014
Location: London
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United Kingdom 2005 Discovery 3 TDV6 SE Auto Java BlackDiscovery 3

Interesting. But shouldnt the heat from a big V6 as well as a Fuel Burning Heater be enough to maintain the engine temperature even when interior heater is set to max?... For comparison, my 2.0tdi VW Golf engine temperature doesn't drop when I put the heaters to max in this weather...
  
Post #176743622nd Jan 2017 7:44 pm
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Robbie
 


Member Since: 05 Feb 2006
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United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

I'm sure different car behave differently due to them being different.

If the coolant is at stable operating temp the system is in balance. If the FBH is running it may only need to be at part load, or it may need max output with the thermostat as another control with dynamic air cooling another variable. But balance is balance, so if you push maximum air through the heater matrix it will heat the air and cool the coolant, so the system is no longer in balance. The system will look to recover the energy lost to the cabin but hysteresis will still bite and it will take time for the coolant temp to recover.

As a small snippet, if the D3's coolant is running too hot (or thinks it is) it takes full control of the viscous fan, turns off the a/c compressor and directs the heater to full blast in an effort to cool the coolant through the heater matrix. The logic being that the humans can just sweat in the cabin, but an overheated engine is just a whole load of pain and suffering.

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 Land Rover - Turning Drivers into Mechanics Since 1948

Battery & Quiescent Current Drain Testing

Diagnostics for:
Defender, FL2, D3, D4, Evoque, RRS & FFRR
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Post #176744422nd Jan 2017 8:03 pm
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