Make sure you dont strip the bolts that hold the thermostat cover on. Clean the thermostat seat well. If your thermostat flange has a small hole in it, orient it to the top. Make sure the o-ring is on the correct side of the thermostat flange. Check while you are taking the old one off :-) Nothings going to break !!
Be very careful when you are filling the engine back up with coolant. Its sometimes tricky to get all the air out as the thermostat can limit circulation till its open.
Put the heater on full hot before you fill. Personally I like to disconnect the highest hose (like the one that goes to the cold start thingy) so I can see that coolant has reached the top. Run the engine for a while, check the coolant reservoir. When you think all is well, go for a short drive and then check the coolant reservoir again.
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