Usually when someone bypasses the heater core it's cause it leaking and they are a pita to change. My guess is that it probably gonna leak but who really knows why they disconnected it. Try capping one end that goes into the cab and putting and air fitting on the other one. Add like 10 or 15 psi of air and see if it leaks out. Air makes less mess than water.
Do you think that coolant will leak if i reconnect the heater hoses without turning on the heater?
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