have you tried removing the radiator and giving it a good flush out? (just a radiator flush out in a bottle will not do!). that's the first step i sugest you follow, removal of the radiator is very simple. i've done it on all 3 of my aw11's, and was amazed in the gunk i got out of it with the simple use of a garden hose.
once you've done that and put in the new thermastat you bought down at the auto store (or toyota is you really want, i'm sure some of the more anal owners can provide you with a part number), follow some coolant system 'bleeding' procedures. http://gb.detonated.org/mr2coolant/
you cannot just refill the coolant system and drive like a lot of front engined cars.
best of luck and enjoy part of motoring histories finest sports car!![]()
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