I have had problems with my 2000 registered Sirion for a few months.
When the engine is warmed up the rev counter shows 2000 revs per minute whilst idleing. When cold the revs are very low and the engine sometimes cuts out.
My garages diagnostic machine identified a faultly coolent temprature sensor, they replaced the sensor which appears to have helped, but not solved the problem.
The car now idles at around 1200 rpm when warm and 600rpm when cold.
Would there be any benefit in replacing the coolent or does anybody have any idea what the cause could be?
I don't think the coolent has ever been changed.