Golf 1.8 MkIII 1986.
Since I've owned the car, the temp guage has risen to the centre line as the car warms, stays there, bang-on, until the engine is swtiched off and the car cools down.
Recently the guage is, on occasion, fluctuating slightly below the centre (never above). I *think* this only happens when the cabin heater dial is anywhere above off (cold), but not 100% sure.
The car is behaving normally otherwise, and the guage is still well within the safe zone. I guess I should check it out though.
Does anybody have any suggestions as to why this is happening?
I dread that it may relate to a small quantity of stop-rust that was added to the system.. (I know, I know...).. does that sound likely?
As always, TIA..
-- S i g n a l @ l i n e o n e . n e t