That's not right and I would not run it. If you can, I'd just source the two hoses that to & from the heater core without the bypass. It never really worked the way it was intended to anyway.

Also, I'd really advise using higher quality hose clamps. Those cut worm gear ones chew up radiator hoses... With the c900, supply is getting thin and you don't wanna do any unnecessary damage to them. Embossed clamps like the factory ABA clamps really are better... Belmetric stocks them.

Clamp ABA Blue S20 Hex Slotted Aluzinc Galvanized Steel

Bel-Metric sells metric hardware & specialty automotive supplies worldwide. Visit our website to purchase metric fasteners, nuts, bolts, screws, washers & more.

belmetric.com

There are other similar ones from other brands but those are a known quantity.

 

 

We threw a lot of those valves away after the Service Bulletin told us to remove them.

 

Interesting. I’ll ask the shop if they are familiar with that bulliten.

 

OK I will take this valve out and for now, put the old one back in.
I will replace with the pre-1990 setup if I can figure out which parts I need from do88.
Thank you for the link to the Belmetric hose clamps!