[ainarssems]

Originally Posted by snapdragon

Well. I don't know what it can be. I bought another thermostat today and thoroughly inspected and tested it in a saucepan. It opened when the water was about 90*c. I just fitted it after work and refilled and bled the coolant with the 3 bleeding points. Tested the old one. Just the same as the new one in the pan. Went out for an hour run and took ages to warm and only reached 70*c as with the original and first new one.

I will do more tests tomorrow and try disconnecting the fans.

Just a guess- maybe it is getting twisted/squeezed when fitted in housing which restricts free movement?

Also once the thermostat I tested in boiled water seamed to work correctly and I only noticed that it is not closing properly later. It was hard to see because of the shape but it always stuck little open about 1.5mm but what are the chances of it happening with 2 new thermostats.