I have a mid 1940's Philco refrigerator in very good condition. It stopped cooling well, I had a service man top it off with refrigerant. Cooled well for about a year, got warm again. borrowed a bunch of equipment from an hvac buddy. No pressure was in the system. I filled it with 200psi...
I have a welbilt from the 50's, my oven burner had an uneven burn pattern. There was a manual flap that could be adjusted to have a smaller or wider opening for letting air through. adjusting the opening size did the trick. Do some looking around down there for the flap. Should be pretty...