[john4788]

I have almost the exact same problem. I replaced the piece thats in the heater hose to the core with a bypass that I controlled the flow of the water with. Sill no hot air. I can hear the "door" open when I change the temp selector from cold to hot but nothing. I was getting some remotely warm air time to time but now...nothing. I fear the core is clogged. I recently had the manifold gasket replaced by a friend and I fear he used their bad well water to refill the radiator. That water will corrode and eat everything metal. Any suggestions?