Eagle Running HOT

First off, how long did you drive the car when the needle was pegged on "H"? If it was a considerable amount of time, you may have some serious problems (i.e. blown head gaskets, warped heads). The first thing I would replace or have replaced is the thermostat. This is a very common thing to go bad in a lot of vehicles, and they are cheap to replace. You still have hot air coming into the car because the engine is running hot. I have seen a couple 3.0L mitsu engines have broken thermostats and run extremely hot. You may want to check the oil and make sure there is no white foam or milkey stuff mixed with the oil. If there is, you have a bad head gasket(s). The next thing I would do is have the cooling system flushed since you smelled burning antifreeze. It seems unlikely that there would be a blockage in the head or block (but still a possibility.) Hope this helps!