I have been dealing with hose leaking. I have replaced the short bypass hose with new replacement hose. It was a very tight fit. I didn't shellac it or anything. I just put 2 new ss clamps on it one on top and one on bottom. The issue is if you run the heater, and warm it up it will leak out the top of that hose. I did a running test last Saturday like 100 miles round trip, and it didn't leak at all without the heater on. If I run the heater, it will force coolant out the top of the hose. The hose that was on there, that I replaced was just mushroomed out at the top. It's trying to do the new one the same way. I don't understand why it would have more pressure etc. with the heater in the string? I don't understand why it would make any difference. Any help would be appreciated!

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Rebe