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Well, there is still the possibility it may be a faulty sender unit as it does not throw out water, or smell hot. Puzzled why the viscous fan does not start for one minute as it should when the engine starts. There are no bubbles anywhere and everything seems OK elsewhere. I too am puzzled. I...

It's almost certainly the viscous fan because it is silent when you first start it and does not kick in at all, even when near boiling point. Back to garage that fitted it tomorrow, it is only 2 weeks old!

Yes, they did that when they fitted the pump. Just had to go out in it to pick up kids from town. Ran just below boil again. I will check the viscous fan tomorrow as well, even though it is new it may be faulty. off to bed, will answer any further tomorrow.

It has always run cool, until today. I got about 3 miles out and it suddenly went from 1/4 to half in a minute or so, and stayed there all the journey, Never been up that high before. I will check in the morning for an air lock. Just checked coolant and is perfect - full radiator and nothing...

Yes, changed the thermostat. It concerns me that when it is running slow the gauge goes up to almost the red. It only slipped back when I increased the speed, not from the fan starting.

Overheat on low speed I have just had a new viscous fan and pump fitted as the old one was leaking. Went on a 20 mile run tonight and the temperature went up to 'normal' while doing normal speeds, whereas it normally only went up to 1/4. It remained constant throughout the journey. Coming back...