Hi Folks, Well my speculations proved true. If you stop the flow thru the heater core the T - stat won't open. It provides the heat source to open the thing up. I soldered up a small U out of 1/2" copper & hooked it up at the eng. htr. outlets. The radiator warmed rite away, & it never wavers from ctr. line on the gauge. Whoda thunk? Thanks for all your input guys, S.

Hi Folks, Well my speculations proved true. If you stop the flow thru the heater core the T - stat won't open. It provides the heat source to open the thing up. I soldered up a small U out of 1/2" copper & hooked it up at the eng. htr. outlets. The radiator warmed rite away, & it never wavers from ctr. line on the gauge. Whoda thunk? Thanks for all your input guys, S.

Thanks for the follow-up. So frustrating to follow a thread through a myriad of suggestions and never know what finally solved the problem. Good job on fixing the overheating issue.