Question about water pump flow

[homelessduck]

I'm wondering if the port on top , to the right ( the one that's usually plugged ) is an inlet or outlet? My truck has a hose running from it to the side of the block , near the starter. I'm installing a coolant filter and figured I might as well just use that hose since it currently has no purpose. Also , I'm guessing someone had an off day when packing my new lift pump. It came with 4 gaskets...lol

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[homelessduck]

Bump

 

[FarmerFrank]

If I remember correctly that is an inlet port as it's on the inlet side of the impeller. I had a ambulance motor once that used that port and one from the front of the head for the rear heater.

Maybe someone was attempting to do some extra cooling?


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[homelessduck]

Thanks Frank! It was ran through what I believe to be a coolant heater. But I didn't know which way it was flowing. The heater was plugged solid so I just eliminated it and ran a long loop between the two intending on using it for the filter later . Now I'm finally getting around to it. Lol