300TD, 617 engine I think...

The heater hose that comes out of the head by the oil filter & IP pump...

Is this the out flow from the block and into the heater core? I want to use this to supply hot water for my WVO conversion.

HOWEVER, I disconnected the hose at the fire wall and ran the engine. No water flows out of this hose at idle. I have to rev the engine before any water will flow. as soon as I return to idle the water flow stops.

Is this normal?

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1987 300TDT
1981 VW MKI Caddy 1.6 diesel, waiting on engine swap
1983 D-50 Power Ram 4x4 "Mitsubishi" 2.3 turbo diesel
assorted gas powered crap and motorcycles

RIP: 1984 300TDT, 1982 300TDT, 1984 190D 2.2, 1992 300D 2.5, 1987 300TDT, 1982 Maxima LD28, 1983 Maxima LD28, Isuzu C223 P'ups X3, 1983 Holiday Rambler 6.2 Banks turbo diesel, 1984 Winnebago LeSharo 2.1 TD, 1985 Allegro 6.5