The 306 HDi has glow plugs within the heating system to warm up the collant so you have instant hot air when demisting the screen.
I assume the 406 has the same somewhere?
Anyone shed any light on this?
Glow plugs in the heating system?
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Bailes1992
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Glow plugs in the heating system?
2020 BMW 520d MSport Touring My Daily
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2017 Dacia Logan MCV 1.5DCi Laureate Wifes
1996 Land Rover Defender 90 County SW 300TDi My Toy
2003 Ford Mondeo ST220 3.0 V6 My Other Toy
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Busman
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Re: Glow plugs in the heating system?
Yep, my HDI 110 does, and very good it is when it cuts in below 10 degrees. Its to do with the cool running of these engines at low revs.
1999 HDI 110 GLX Estate Sold On at 230,000 miles to the lucky John
2003 HDI 110 Rapier Estate
1998 D8 1.9XUD Estate LX 7 seater Estate sold, with regret
1999 306 1.8 petrol.
2003 HDI 110 Rapier Estate
1998 D8 1.9XUD Estate LX 7 seater Estate sold, with regret
1999 306 1.8 petrol.
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steve_earwig
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Re: Glow plugs in the heating system?
mine doesn't, instead it has a water jacket around the egr pipe - one reason for not blanking it i guess 
Unskilled meddling sin©e 2007
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Doggy
- Mod with a 2.2 HDi, De-Fapped!
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Re: Glow plugs in the heating system?
Mine's got both, but I thought the egr heat exchanger was to prevent damage if the valve opened / failed to seal during a FAP regen. 
2002 HDi 2.2 Exec Estate, (2008-12) (wonderful)
2003 HDi 2.2 6-speed Exec Estate (2012-19) (also a gem)
2009 Citroen C5 2.0 HDi VTR+ Estate (godawful heap)
2008 BMW E91 330i touring (great fun - murdered by a reversing SUV)
2007 BMW E91 325i touring (slower smoother quieter)
2003 HDi 2.2 6-speed Exec Estate (2012-19) (also a gem)
2009 Citroen C5 2.0 HDi VTR+ Estate (godawful heap)
2008 BMW E91 330i touring (great fun - murdered by a reversing SUV)
2007 BMW E91 325i touring (slower smoother quieter)