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A few last tips:
1) Remove ALL the sealant from the housing and the mating face on the head. Use a razor scraper with great care. The steel in the razor blade is harder than the aluminum in the head, so with not too much effort you can carve off bits of aluminum! I use a flat-tip screwdriver. Same tool on the housing.
2) Drain a little coolant first. I usually loosen the lower radiator hose from the radiator, and carefully open up for a short time. That's to get the coolant level in the head lower than the thermostat level. You will need to replace the coolant. Easier yet is to do a coolant flush concurrently with the thermostat replacement.
3) Before you remove the housing from the head, remove the upper hose from the housing. When you are ready to install the new thermostat, run something through the housing so you can pull the thermostat up into the housing and hold it there while installing. You can then pull out the string, or whatever you used, and connect up everything.
4) Fill coolant and run until the thermostat opens. Have the heater control on full hot to flush that core too.
5) Add coolant as needed, and squeeze the upper hose to burp out air bubbles.
6) Remember that coolant has a smell that can attract critters that will drink it...and die.
Good Luck,
Bob
:>)
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