I did pretty much the same as my temps were running low. There must be alot of people out there that are running their cars with a duff thermostat thinking it's fine. Another way of checking whether it's knackered is to grab one of the coolant hoses going to the radiator when the car is getting warm from cold. In theory, the coolant shouldn't be pumped to the radiator unless the thermostat valve opens, so if it's getting warm quite early in the warming up stages, the thermostat is probably shot as it's allowing the coolant to go straight to the radiator rather than retaining it in the block until it's up to 87 degrees, then releasing to the radiator to cool down.
As mentioned in the last post above, you can use the bleed screw on the water rail above the exhaust manifold, but I didn't bother as it appears to be made of soft cheese. As soon as the allen key went in, it rounded straight away with very little torque at all.
Last edited by Mark_JTD; 07-12-09 at 11:25.