To complete the series on the MGC coolant system, in this video I’m going to attempt to do an OK job of describing the engine coolant system and then I will detail the process of testing a thermostat to ensure that it is operating properly.  You can see my other posts:  Coolant System Flush & Thermostat Install and Coolant Filler Cap vs Expansion Tank Cap.  As usual, pictures are at the bottom of this post so be sure to scroll down.