I had been encountering overheating (as well as heating up) issues with the MR2 since day 1, and finally got around to switching out the thermostat. Little did I know that I had a previous owner had removed the thermostat, small doubt as to why (he was trying to fix the occasional overheating issue as well). After replacing the thermostat and giving the whole system a thorough coolant bleed, she now heats up right away and has not yet overheated, even after a few long spirited drives. (I used this guide for the thermostat http://www.padandwheels.com/mr2/thermostat/thermostat.html) Also I painted C pillar trim as it was looking quite sad and faded. Pics
And a pic of the car as it sits.