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185 Posts
The heater core looks really big in the picture when you zoom in but in reality it is very tiny and the coolant ports are almost microscopic. There isn't really much flow on the one end so even trying to back flush it would only work if you could put some serious pressure and flow through there. I am sure people have had success, but it is only temporary. I like the idea the guy in the video had of hooking a hose to his water heater and flushing the heater core.