Easy as pie... just do it when the engine and coolant are NOT hot!
What you will need. 1 gal zip-lock bag, or any plastic grocery bag (that you're positively sure doesn't have a hole in it). A 1/2 in. socket with a 4-6in extension. Maybe a medium regular flat screwdriver.
1) Take off your stock or aftermarket CAI so that you can see the front of the engine. You actually may be able to to it without removal of the air intake, but it will definitely be easier if you take it off. Let me know if you don't know how. For this you will need a 10mm socket for the air box hold-down. You also need to move the electrical snake that crosses over the radiator up and out of the way.
2) Standing in front of the engine see the upper radiator hose to your center left. The Tstat is between the end of the hose and the engine block. Remove the PVC hose from it's lower connection and (if using a grocery bag) string the bag under the Tstat housing and secure the bag handle over the lower PCV hose nipple and the other handle somewhere on the other side (just has to be secure and tight around the bottom of the hose/housing.
No.2 is the radiator hose
3) Loosen the two 1/2 in bolts holding the Tstat housing the the block. Coolant will begin to leak out, but as long as you don't open the reservoir cap, the amount will be very limited.
4) You simply need to move the hose out of the way. I did this using a short bungie chord and the fuse box terminal as the anchor... In the picture below the Tstat is already out of the block (evidenced by the pool of reddish coolant visible in the block's Tstat throat...
This is a good time to check inside the Tstat housing connector and down inside the radiator hose itself. When I did this I didn't particularly like the look of the Tstat housing... it looks as if it was painted internally, and of course the antifreeze does a number on paint. But what was left didn't wipe or scrape off, so I left it.
5) Ensure that your collection bag is still secure. To remove the Tstat take the regular screw driver and gently pry up on the over-arching axis support. It should pop out easily. At this point quite a bit more coolant will pour out of the block (thus the warning at first).
6) Remove the rubber gasket from the stock Tstat and reuse on the new, 180 Tstat. Use a little coolant to lubricate the gasket's inner ring and outer surface. Then carefully reinsert the new Tstat into the block making sure that the Tstat breather hole is to the top. It will be a tight fit, so just be patient and apply pressue evenly until the gasket pops into place.
7) Carefully return the radiator hose and reattach the Tstat housing tightening the two bolts evenly. I don't know the torque setting. Just make sure they are snug and check for leaks after restarting and running the engine for a while.
8) Carefully remove your catch bag (zip-lock or other) and return the excess fluid to the coolant reservoir.
9) Done.
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