Originally Posted by cassymai
Not sure if the A/C system was discharging water.
I am assuming that if the A/C system is discharging water than the seawater piick up is working ok.
You are correct. If water is discharging, the system is open from end to end. Pick-up -> Seacock -> Raw Water Strainer -> AC Pump -> A/C Unit -> Discharge overboard.
One easy way to determine is to look at the A/C unit. There will be the incoming raw water line and the discharge line. (Hopefully you can access and follow it). Try putting some water in the bilge and running each bilge pump to verify which discharge is which. You should have discharges for deck drains, bilge pumps, sinks and the A/C. I'd expect the A/C discharge to fairly close to the A/C unit itself.