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Q: Which heater hose goes to which fitting on the firewall? on 1999 Cadillac Seville STS

I have a 1995 Cadillac Seville STS with a Northstar engine. The heater core has been bypassed and I need to know which of the two hoses goes to what fitting on the firewall. To clarify I am working on the passenger side of the engine compartment and have new hoses to replace the old ones. The heater and cooling systems both worked before I took it to a local mechanic. Why he unhooked them is beyond me but I think it has to do with an overheating problem he had been trying to fix.
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on the heater core the nipples are slightly diff sizes, so insp that to determine which hose goes where. also be careful not to damage heater core
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