loopyles
Member Since: 25 Oct 2007
Location: Northumberland
Posts: 269
  
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I am lucky enough to have a garage big enough for all my toys and my D3. I live in North Northumberland so -5 degree days are common, when I enter my car and start her up the temp in the garage is normally a constant 10 degrees Boiler and under floor controls housed within so car temp reads above 5 degrees I then drive out into -2 with no FBH on and it seems to take an age for the external air temp to go down and the FBH to cut in.
So the question is, leave the car out and let the FBH do its job or keep it in the garage with I guess the oil at a higher temp or should the outside temp on the car register immediately I leave the garage and turn on the FBH. I hope this makes sense.
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 21st Jan 2009 5:13 pm |
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simonsi
Member Since: 14 Oct 2007
Location: Auckland
Posts: 1264
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The reading on mine seems damped and can take several minutes to change from say +8deg when the sensor has been sat in warm air as the engine cools to -2deg ambient when restarted after a run then stood stopped. Cheers
Simon
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| 21st Jan 2009 6:04 pm |
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John C
Member Since: 28 Aug 2007
Location: East Yorkshire
Posts: 3292
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Ice pack on the sensor? Bit of a faff though?
Turn the garage into a swimming pool or tennis court and park outside  2020 SDV6 D5 HSE, Carpathian Grey +
2022 Tesla Model Y LR... almost Carpathian Grey
Previously : 2005 TDV6 SE Auto, Cairns Blue (288K) - ours for 16 years
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| 21st Jan 2009 6:15 pm |
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wavey66
Member Since: 25 May 2007
Location: Hertfordshire
Posts: 158
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I seem to remember you can get a remote and/or timer for the FBH ? you could then have it on before you leave. Plenty of threads on here about getting this sorted. I'm sure one of the more technically gifted chaps on here will assist.
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| 21st Jan 2009 7:57 pm |
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simonsi
Member Since: 14 Oct 2007
Location: Auckland
Posts: 1264
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Unnecessary quote removed
But the FBH shouldn't be run in a confined space such as a garage... Cheers
Simon
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| 21st Jan 2009 9:36 pm |
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biglouie
Member Since: 29 Jan 2008
Location: North Wales
Posts: 20
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Lucky if you get your's started! I've had mine 'reset' twice by the dealer this winter but its not working again 
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| 3rd Feb 2009 11:03 pm |
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NJF
Member Since: 05 Oct 2007
Location: Gone
Posts: 2466
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I don't understand this thread. If you park your car in a 10C garage, the engine's temperature at start will be 10C, and it will rise as the engine heats up. Therefore the FBH will not start?
Once you leave the garage, the external temperature indicator will gradually fall to external temperature. Note the word gradual. If you stop at a junction for a while, you might see the temperature gauge rise a bit. That's because the temperature gauge is affected by windchill, and will have a bias to the garage temperature for a short while after leaving the garage. After a while it will have a bias to the new ambient temperature, i.e., the external temperature. Digital gauges are more sensitive to the human eye than most analogue gauges, IMHO.
HOWEVER, the engine temperature will be 10C on start, rising to normal operating temperature. If the engine is warm, why would the FBH start, no matter what the external temperature?
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| 3rd Feb 2009 11:28 pm |
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blueanchorinn
D3 Decade
Member Since: 07 Mar 2006
Location: In a pub in Devon
Posts: 973
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The FBH will start to run as the external temp drops to 8 deg whatever the temp of the engine. My D3 lives in a garage where the temp is 18 deg even this weather but within a few minutes of being outside the FBH kicks in at 8 deg or so Pot Noodle Challenge Winner 2011
I refuse to have a battle of wits with an unarmed person
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| 4th Feb 2009 12:04 am |
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10forcash
Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534
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The FBH will start if the coolant temp is <75 degrees and the external temp is <5 degrees, the issue is the 'heat soak' from storing the vehicle in a heated garage causing an offset from the actual air temperature once the vehicle leaves the garage....
The only way I can think of to rapidly remove the heat soak from the external temperature sensor is a 5 second blast with a CO2 fire extinguisher.... or accept that the D3 will take a few minutes more to warm up  given it's usage pattern is outside of the 99th percentile
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| 4th Feb 2009 12:04 am |
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blueanchorinn
D3 Decade
Member Since: 07 Mar 2006
Location: In a pub in Devon
Posts: 973
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That's what I meant  Pot Noodle Challenge Winner 2011
I refuse to have a battle of wits with an unarmed person
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| 4th Feb 2009 12:09 am |
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pom
Member Since: 10 Feb 2008
Location: Worcestershire
Posts: 1790
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In response to your original question.
If you started and left the car in your garage and let it get to normal operating temperature the FBH should not kick in when driving it outside into a colder temperature.
If it does then its a bug in the software as it should not be applying more heat to an engine that is already upto temperature.
On the other hand, if you drive out before the engine is upto temp then it is working as intended.
Pom
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| 4th Feb 2009 12:17 am |
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mac.marty
Member Since: 30 Jan 2009
Location: Wiesbaden
Posts: 68
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10forcash wrote: or accept that the D3 will take a few minutes more to warm up
while you could live with the longer time as a passenger, I would still prefer my engine to reach normal temps as soon as possible in regard to fuel and wear.....
Martin
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| 5th Feb 2009 10:39 pm |
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10forcash
Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534
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If the external temperature was 10 degrees, the FBH would not fire up... i'd bet that the coolant and engine block temperature is at least 8 degrees after a night in your heated garage so wheres the problem?
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| 5th Feb 2009 10:49 pm |
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