intermittent temp gauge

[Alan Lubow]

I recently purchased a 1994 Auto quattro 90.  I put on some Pirelli Carver
snows, and so far it seems like a great winter car!

I've noticed the temperature gauge only works intermittently.  When it works
it seems to function just fine, then I'll glance over and notice that it's
pegged fully to the left (indicating cold) even though the car is running
just fine.  Eventually it starts to function again, maybe with the next
drive and maybe not.  Any idea where I should start to track this problem
down?

Alan
Denver, CO