How much back pressure should you see when you try to flush out the heat exchanger?I'm trying to find my heat issue. I took off the fitting from the raw water pump to the exchanger and tried to hold a garden hose up to it to flush it out and there is quite a bit of pressure pushing back on the garden hose and spraying water everywhere. It does push water out the exhaust but not as much as I think it should.I flushed the rest of the system and replaced the impeller,also tested the thermostat in a pot of water and it is fine.
