Quote Originally Posted by 34_40 View Post
What? they want you to measure the coolest part of the system? I've never heard of such a thing.
Quote Originally Posted by 36 sedan View Post
JMHO, I believe they mean it is for the electric fan temperature switch.
Bob, you're likely right but like Mike it surprised me. I initially thought it was for an anode, but decided a brass plug would be just fine!