It's easy to fail to fully heat the hose with the heat gun. It takes some experience to know how hot to get it, but it should be pretty hot. Also, don't just heat the end, you want a couple inches of length heated.
"Radiator Hose Grease" is available at auto parts stoes and is a better product than sish detergent for lubrication.
Hint: When you push the hose onto the fitting, make sure it goes all the way the first time. Stop half way and you'll probably have to cut it off and start over ahain.
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