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 offRange Rover Westminster 4.4 TDV8 what a car
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8th Nov 2016 5:05 pm
Martin Site Admin and Owner
Member Since: 06 Nov 2004
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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 fixRange Rover Westminster 4.4 TDV8 what a car
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8th Nov 2016 5:10 pm
Martin Site Admin and Owner
Member Since: 06 Nov 2004
Location: Hook Norton
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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 25.7mpg06 D3 SE / 15 LR D90 XS SW / 88 LR 90 Td5 / 68 BMW 2000 ti
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8th Nov 2016 5:19 pm
riverblanche
Member Since: 31 Aug 2010
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Hi,
worth checking your thermostat as well
friends car was running the fbh after we had travelled over an hour but driving very steady through a forest
thermostat stuck open.
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Thanks for the info Martin prob not as bad as i though then must be my lead right foot to blame Range Rover Westminster 4.4 TDV8 what a car
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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?
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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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..
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22nd Jan 2017 7:17 pm
aman
Member Since: 09 Feb 2014
Location: London
Posts: 285
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...
22nd Jan 2017 7:44 pm
Robbie
Member Since: 05 Feb 2006
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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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