12.7 Detroit pushing coolant out of overflow

This started out with the fan not kicking on at 210*, coolant temp got up to 225 on me, and for the rest of the trip I drove it gently to keep ECT down. I figured if it ended up being an issue I could pull over and unplug the solenoid on the front cover and force the fan on all the time. There was only one more hill on my route, and I was careful to keep the temps down but they did get up to 220* on me. At the end of the day I find that coolant had been forced into the overflow and I was empty on the side you fill. I topped it off and headed home, now it is puking it out too fast to risk it so I'm finding a shop or having it towed. It got up to 230* on me so I let off and coasted into a truck stop and not risking doing anymore damage.

Anyone have any ideas? 98 Volvo just hit 1mil yesterday.

 

Probably pretty old lol. Would that cause my overheating issues on hills too though?

 

That's the other issue I'm having. It kicks on and off at idle for the AC but not at 210 pulling a hill.

 

Yup it is stuck.

 

Yup mine works just like that. Key on, air pressure up it spins freely. Key off it doesn't move