Perhaps off topic.
A few years ago we were camping in Banff national park when we smelled antifreeze inside our van and not long after it was squirting out of the heater area under the dash. With jugs of water we made it to a good sized town out of the park (Rocky Mountain House), stopped at Canadian Tire, which didn’t have a heater core or time to install one in the next couple of weeks. We were directed to Dick’s Fleet repair and found out that it would take at least a full day of work and they couldn’t start for a week. But they could short circuit the heater hoses to bypass the leaking heater core - in an hour! Wow, if I lived near Rocky I would be getting all my mechanic work done at Dick’s. Yes, I did contribute doughnuts. The only part needed was a short plastic pipe larger on one end because the outgoing and return hoses have different diameters. So one more part for Jaxdad’s suggestion.
We got home in comfort as it was summer time. Eventually I tackled the job myself and the 1992 GM van is still running well, including heater and air conditioner.