I have a 55 reg Mondeo Mk3 1.8 petrol Zetec for the last 12 years, 91k on the clock
I have cared for it well - regularly services and she still drives beautifully and looks great.
But just recently I noticed the temperature gauge needle fluctuates on long runs (it has previously always remained solidly in the middle once the engine is warm).
So what happens now is that it stays in the middle for around 15 minutes then it suddenly jumps up to nearly in the red, then after a few minutes jumps back to around a third before jumping back to the centre again! The needle doesn't move slowly up and down but "jumps" around! Most bizarre! And happens at all driving speeds. I took it on a two hour motorway run today and it was jumping throughout!
Just wondering if anyone had a similar problem, or would have an idea what's happening? I would add that the car drives beautifully when this is happening, and it ticks over fine at standstill.
My garage thought it may be the sensor, so they changed it but unfortunately that hasn't made any difference.
Before I take it back, I thought I'd ask here first.
Thanks for reading this.