I was checking heater hose and bottom hose had a leak in it, don't know if this is the main problem but looks like it. I was taking the hose off and it just started falling apart so I start taking top hose off and the heater core pipe broke off. I didn't know that the top pipe is plastic and it just crumbled in the hose.

So I have a new question, has anyone put a heater core in one of these ? I have a haynes manual and it looks like a major PIA.