Is the dashboard light for the glow plugs
ALWAYS supposed to come on when you turn the
key? Is there a temperature sensor that keeps
the dashboard light off if the cylinders
are "warm enough"?

My pre-heat light comes on when it's cold
but not always after it's been running or
even an hour after it has run or if it is
around 55 degrees or warmer.

I've had the car for 3 weeks. It has done this
since I've had it. I just changed the glow plugs
to no effect. Also changed the 80A glow plug
fuse to no avail either.

thank you,

- Jeff

1982 w123 240D