I have a 1998 disco tdi.
Some times the rear windows won't wind down or if down can't wind up. Bad if raining.
I notice most times the glow indicator light doesn't work and when this happens usually the rear windows work.
and if the windows work the glows don't.
What is good in diffs to stop whining?
I changed all the diff oils and then the whining started.
what is a new set of glow plugs worth?