RE: Thermostat bolt broke off
I agree, DO NOT try to do that without first removing the ac, alternator, and accessory bracket.
Even IF you were able to drill a straight hole in that bolt, you will need to be careful with the extractor.
They are VERY hard, but that also means they are brittle, make sure you are not wiggling around when you are turning it. You definitely dont want that breaking off in the bolt, cause you wont be able to drill it out.
Just happened to me a few weeks ago when working on my quad, luckly I still had the head of the bolt to work with.