>From P.J.Kenny
&&Well, I haven't a *clue* what a glow plug looks like - or where
&&the lil' critters reside in the engine bay.  My friend said
&&that a plug costs around fifteen pounds apiece and that I may
&&have to replace only the faulty ones.

I paid approx. us$13 for each of the "fast" plugs--see, there are fast & 
slow, recognizable by the color of the ring--this can be seen from the 
outside, it's right where the "glow plug bus bar" connects to the glow 
plug.  (Bentley sez:  replace 'em at 60K (mi))Fast=silver; Slow=brass.
The FLAPS/FLARS said no price diff, so I bought fast ones.
(Then I discovered that my glow plug in-line fuse was the 
problem--located underneath a little plastic cover; directly in-line 
with the large red wire which gives power to "glow plug bus bar").

The glow plug slightly resembles a spark plug from the outside; the 
inside part is a small (2-3cm) carbon tip, which when power is applied, 
glows.  

You'll find your glow plugs directly underneath the injectors, which you 
(or the mechanic) must remove to access them.  (Bentley sez:  get new 
injector heat shields when removing/reinstalling injectors)  

I temporarily obviated the problem by plugging in my block heater; yet 
after spending $50+ and realizing I only needed to spend $0.70...sheesh! 
(at least I now have 'em!)

John K. Hopp
University of New Mexico
'70 Kombi
'92 Jetta EcoDiesel