AC water pump

32carv

32carv

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I have a new to me '93 350 aft cabin. Does anyone know where the water pump or pumps for the air conditioning units are located. I turn on he breaker for it an nothing happens. The units blow air but no water pumping to units. Can't hear pumps run.
Jim
 
I bought a 97 325 Aft Cabin last year, and it took me a while to find that the Ocean Marine AC units have a three minute delay from the time you turn them on until they start pumping water and providing cool air. Worth checking to see if that is the case with your units. I thought my AC units were inop, but it turns out they were just fine.
My pumps are in the bilge just forward of the engines. A previous owner modified mine to have a separate pump for each airconditioner.
 
The pump may not come on until the compressor kicks on. Can you hear the compressor come on?
 
The compressor comes on but no water flowing. Should there be a delay?. I have never seen that. Never let it I get to 3 minutes, didn't want to cause damage.
Jim
 
I think that boat is the same setup at the 356 I had. One water pump is on the port side, in front of the engine along the side near the fuel tank. You can put your hand on it and feel it if is on when you turn the breaker on. Mine was airlocked when it launched last week. Had to loosen the top of the strainer cap and let a little water out, then it started pumping. It should start pumping out water pretty quickly after the breaker is turned on.
 
The previous owners of my boat all did a great job of keeping manuals for all of the equipment on the boat. The Ocean Marine AC units on my boat, according to the manual, have this three minute delay. The fan does start running when you turn the breaker on, but there will be no water flow until the compressor and the pumps start running after the three minute delay. If your units are Ocean Marine, this might be what is going on. I don't know if other AC manufacturers have this delay. I was worried about damage so had not gotten to three minutes either. Then I finally got around to reading the manual, and found the info about the delay. Had considered the airlock possibility as well.
 
The fan and compressor run right away but no water flow. I am assuming there should always be water flow when the compressor is running. I will investigate more today. Not sure what brand ac but I will look today when there.
Jim
 
If the compressor is running then you might have a bad triac which is what turns on the pump.
 
The AC water pump is in the engine room bilge right in front of the port engine. Like stated before, over winter the strainer can get air in it causing an airlock. The pump is not a flexible vane pump, so without water to pump, it will not suck anything into it. There are two ways of purging air...1) loosen strainer cap until water comes out...this may or may not let water get to the pump impeller...2) loosen the 4 to 6 screws on the impeller housing on the pump until water comes out....this will ensure that water is getting to the pump impeller. The pumps for AC are relatively quiet and you may not hear them running with the bilge all closed up. I would do the purging exercise with at least one of the units running...you'll hear when the pump starts to suck water. Also, make sure that the circuit breaker is on for the pump (if there is one)
 
If the pump isn't where others suggested....Locate ALL your thru hulls as you need to know where they are anyway. trace their hoses so you know what each one is for and one of them will take you straight to your AC water pump.
Any possibility that your Pump thru hull is closed and that is why you are not getting any water flow?
 
At the boat. Turned on heat all works now. Air lock may have cleared itself or maybe I'm just a dumb ass. Probably the later. The pump is in front of the port motor.
Thanks for help.
Jim
 
F future reference, a Triac is like a switch. It is used to turn the raw water pump on. It should be located in the ACs control box. They go bad from time to time.
 
On my Mainship the AC common water pump always gets air bound. Try loosening the fitting on one of the output lines at the pump while the pump's breakers are on, this is usually enough to take the air out of the pump and prime the system.
You'll know if you are successful if you see water flowing out of the AC units through hull. The pumps are very quiet and in most cases it's simply a matter of priming the "non-priming" raw water AC circulation pump.
Bill
 
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