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Hello Spook
I have two Volvo heater hoses, same part number, made in France though, same bump as you described, extending to the bend. The last 1 1/4 “ for the tube or heater valve is perfect. I would not worry about it. I really never would have thought much about it.
When you replace the hoses, and if you’re going to replace the coolant, flush the engine after removing the t-stat. Also open the block drain. Flush out the heater core with a hose attached. The copper tubes coming out of the fire wall are very soft, so be careful there. Don’t attempt to pull or twist those hoses. You will have to carefully cut the hoses lengthwise there.
One of the toughest jobs is removing and reattaching the hose to the block under the manifold, without removing the manifold. I kind of twisted it by hand, and then wedged it out with a screwdriver through the manifold.
I used a little sensor safe silicone as a lubricant at some of the tube ends just to make it easier to slide the hoses on (especially at the tube under the manifold).
Good luck
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Tom F. Three 940s. One down. Mods, RainX. Lien holder on two more (the kid's). Rust In Pieces, '78 245
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