I replaced my original radiator w/ a 100% copper radiator in my 81 300D N/A. All was well except I found a leak coming from one of the hoses. The hose is small, on the driver's side bottom of the radiator. It is now parked and I'm driving my wife's 124. I cannot find the hose in the FSM. Where does this hose go and what could be the issue?

clint

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81 300D N/A 130K miles (Nelly)
87 300D Turbo 80K miles (The Scalded Dog...because it runs like a scalded dog)
95 e320 Wagon 104K
2003 Sprinter 47K miles.
1999 Tandem Bicycle
One beautiful low miles wife (who likes diesels) (that's my wife holding the sign)

My son and I fixing Nelly's odometer