Station House
Well-Known Member
Not nessy-celery. If it is the incorrect sender fitted, the temp will rise into the red when under load. The themostat then opens causing the temp to drop again. Seeing as 300tdi's are overcooled, if the sender is mis-reading the temp range then it could be it's showing too low when engine load is removed when the vehicle is on the downhill stretches in the current cold spell we're having.
Fair enough Rats - gladly bow to your knowledge. Had only previously come across the wrong sender reading hot and staying hot rather than fluctuating widely.