The A/C will not run without water….True that is a Consistant…Or Constant….Either Way…No Water Flow…No A/C !

I'm not there to see why you loose water flow, and really can't say from here…But one thing is for sure…You will consistantly loose A/C if you don't find your water problem.

Steve~

Geoff~

There should be nothing but hose between the pump output & the A/C inlet….Your problem has to be in the plumbing, thru-hull, or the pump…Maybe sucking air and causing the pump to loose prime…The A/C unit is just shutting itself off as a protection.

Shut everything off & look for leaks…These leaks will suck air when the pump is running…

Geoff,

Most all A/C pumps have hard impellers & are not self priming if installed incorrectly…These type pumps draw less amperage and are much quieter & durable than a rubber blade impeller pump.

Changing the pump is not the answer…Finding why this one won't prime itself is.

If this pump is sucking air…Any new one will too…Aerated water is not a very good cooling medium, and that is what will be sent to the a/c, so it will work harder with aerated water.

Some things to look for in your plumbing….

• Look for a constant uphill run from thru-hull, to strainer, to pump…with no hose dips or loops.
• All three of the above must be mounted below the water line…No hose between should rise above the water line either.
• If you have the Perko strainer with two wingnuts for checking the basket…Be sure those nuts are tightened evenly…With that strainer it's easy to get the cap cock-eyed…Also be sure the cap gasket is good…Some were cork & wore out easily.
• Be sure there is a forward facing scoop over the untake on the hull…If not…The Venturi effect of the water passing by at 8 knots or above will pull the water out of the pump.

If you post a picture of your installation I may be able to be more specific…

Steve~