Hello all! Having a frequent leaking problem with my '76 Skyline Challenger. It's been coated several times, but it eventually comes back to this cracking state after a couple years. https://tinypic.host/images/2024/01/04/20231126_094848-EDIT.th.jpeg Click for full size image. I feel it's gotten bey...

I just did a thermostat on an M1MB (no AC). The C wire connects to the grey wire in the furnace. The thermostat instructions state it is commonly the blue wire. The electrical schematic is on the inside of the circuit board cover panel. (Caution, line power is in this panel. Turn off the breaker bef...