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[robson]

Can anyone tell me how I can check without stripping the engine whether my thermostat is functioning properly.I would have thought that the indicated temp should rise quickly if it is ok or am I wrong.
ron

[Andy H]

Yes.

5 minutes idling or a couple of miles driving and the needle should be starting to move.

15 minutes / 5 miles and it should be steady at between 80 and 90 degC. It may move around between those figures in normal driving but if it drops below 80 (once it has gone above it) then budget for a new thermostat.

If it goes above 90 then start reading the excellent guides here on the cooling fans and (electric) thermostats and flushing the cooling system.

I changed the thermostat on mine about a month ago because it only got up to temperature when climbing steep hills and then dropped again after. Fuel consumption has improved from just under 20mpg to just under 30mpg

[tunnie]

sticky thermost stat, as in our 3.0 at the moment, which i really should change. Take an age to heat up, and sits at 80 on the temp gauge (facelift dash)

Temp should always be bang in the middle of the gauge, only raising slighly in traffic before the fans kick in. It should never pass 100

[Boracic]

My 2.6 is up to about 80c in a miles driving, but it takes forever when running at idle