Well, I just finished the heater core!All went well, but still a pain. Anyways, went to change the thermostat, and got what was supposed to be a replacement from Autozone. Well, after about an hour and a half I decided that the new one was not going to go in. Seems the aftermarket thermostat was slightly larger than the factory one with o-ring gasket. So, instead of paying $7, the stealership charged $42 and change. Anyone else run into this problem, or is it just my bad luck?