Greetings and thank you for taking the time to read this. I recently purchased an 88 3807 that has been fitted with thermostats instead of the 3 switch controls of the past. Historically when I would turn on the AC in my other boats I would turn the AC knob to start, then check to see that water was being discharged then turn AC to run or soemthing like that. Anyway now the unit just comes on all at once but I dont see any water being discharged. I checked the through hull, the screen, the impeller and all look fine. Do I need to prime this system with water somehow or should I just let it run a bit longer and see if the water comes through. I have only run it for about 2 minutes at a time so far. Any help would be greatly appreciated, thanks.

tls