After i put a motor out of a 94 4 runner 3.0 into my 1990 4 runner the thing ran great i drove it around for about 2 hours with no problems. the next day i was driving it and i noticed that it was running a little hot but never over heated. i am guessing that the thermostat is out. i was a little low on antifreze so i topped it off and found a rubber gasket in the radiator. any help would be great. thanks:bash: