Thanks, Dakota. The coolant didn't look cloudy when it came out, and it was dealer serviced its whole life, so I agree with you this is probably the result of old coolant. I'll just remove the scaling residue on the mating surfaces and not worry too much about what is on the inside. I may run distilled water and/or flush through the system once it's all put back together. I'll keep posting updates, and thanks again everyone.

 

Dakota, I am impressed by your skills. I worked on this last night and struggled to remove the hose. Man is it a tight spot! I have straight and 45 degree long needle nose pliers. I was able to push the spring hose clamp down the hose but not all the way off of the outlet before the intake manifold interfered with my pliers. I tried to grip the hose with my pliers and wiggle back and forth, but wasn't successful. Any more tips? At this point, removing the intake manifold at a later date seems easier.

The hose seems in good shape compared to the brand new hose sitting on my bench, so I'm not desperate to do this fix right now, but I am a bit of a completionist.

 

You really just need to twist the those to get that "stiction" to break then it slides right off. I do agree that it may not be a critical hose to replace. The first time I did one was because a mouse chewed through it. But... it is still an old hose and still subject to the same pressures. Not to mention it is one of those hoses you obviously do not want to repair roadside.... So it could be good for another 20 years, or not...