The "coolant glowplugs". Mine has 3, the idea is to get them to heat the 
coolant a little faster. IIRC they don't come on until the engine is running 
and are of debatable value.

-Curt

Date: Wed, 20 Nov 2013 10:27:22 -0800
From: Alex Chamberlain <apchamberl...@gmail.com>
To: Mercedes Discussion List <mercedes@okiebenz.com>
Subject: Re: [MBZ] OT: The glow plugs came on!
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On Nov 20, 2013 9:42 AM, "Curt Raymond" <curtlud...@yahoo.com> wrote:
>
>
> Another interesting part of this ('98
> Jetta TDI) car is how long it takes to
> get heat. Right now it takes just about
> twice as long as my '84 190D. On the
> TDI boards they put this down to the
> efficiency of the engine.

My ex's '00 diesel bug had a 5th glow plug as part of the climate control
that comes on with the other four to heat up the cabin.

Alex
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