Originally Posted by bonnie94ssei
Remove two 10mm bolts from housing.
Pull off housing - you will lose coolant don't worry, refill later. The thermostat sits inside.
Scrape off old gasket material on both surfaces BEFORE remvoing the t-stat.
Remove t-stat, install new one with new o-ring
Put gasket in place, bolt everything back up.
Fill the coolant tank back up to the right level
Turn the car on
Let it heat up
Un-screw (don't remove) the bleeder screw on the thermostat housing
Once coolant starts comming out tighten it back up
And finally fill up the coolant tank to correct level agian.
Put a pan of something under the car. A good amount of coolant will get on the ground.