Quote Originally Posted by Amnesia
...such as replacing the thermostat... now that looks too easy, until you realize where it's at! ...or should I get my glasses again?
If you do replace the t-stat while you have the intake off, have a replacement O ring on hand for the hard pipe that runs back to the heater system. The pipe is in the way of t-stat removal, if you've damaged the O ring, you won't know until it's all back together & you're adding anti freeze.

And yes...that's the voice of experience.