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I’d bet that flaw is in every Volvo brand heater hose and it is minor enough not to cause a problem. I am also not convinced that it is a flaw, but rather a manufacturing process.
For flushing, I just blasted the garden hose into a connected cooling hose and let the water poor out where it wanted. No science, just blast it. Example, put the garden hose in the heater core hose and turn the water on full blast and let it come out the bottom hole or hose. Keep the engine drain open all the time. BTY both the Nissen and the Blackstone radiators have drains cocks. Do the same for the radiator. For the engine I blasted most of the water into the hose that leads into the T-stat housing.
There is no need to start the engine during this process unless you are using a “coolant system flush/cleaner” product.
Now rinse out the hose water with a gallon of distilled water.
The hose connection at the head under the manifold is very robust unlike the tubes going into the firewall. You can get three fingers from each hand on it. You can hold the clamp with two fingers and tighten it with a screwdriver. But you cannot get a grip in it. You can break the seal by twisting and using a little shearing action with a screwdriver from above.
Detergent to aid in hose installation, not sure if that is a good idea. A very light smear of silicone will harden and will not contaminate the coolant.
Refilling: After you get all the hoses on and drains closed; pour in 50% of the system’s capacity of UNCUT coolant. Fill the engine first through the T-stat housing. Install the T-stat, air hole up, and it’s cover and pour the remaining coolant into the overflow tank. Reasoning for using uncut coolant is that you do not know how much water is remaining in the engine and other parts. If your system capacity is 10 quarts, add 5 quarts of uncut coolant and then top it off with distilled water. This insures a 50-50 mix. (If you were doing this in the winter, I’d top of the overflow tank with a 50-50 mix.)
Warm the engine with the heater on until the T-stat opens. Top off the coolant with distilled water after it has cooled.
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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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