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Old 05-23-2016, 08:27 PM   #1
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AC overheat

https://youtu.be/gZHSUl1sx88

So I'm getting a HP error on my Ac and very little water exiting outside the boat. Strainer clean.

I figured maybe something clogged intake at sea cock, but can't dive on boat. Blew back through sea cock with shop vac and got bubbles coming out of sea cock.

Does this look like a normal amount of water coming in an open strainer it do I still have a clog?
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Old 05-23-2016, 08:29 PM   #2
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Sounds like your pump impeller is going out.
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Old 05-23-2016, 08:31 PM   #3
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The water should be gushing out. You do have a clog or the seacock is not fully open. Try working the handle back and forth a few times, that might help to clear it.
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Old 05-23-2016, 08:33 PM   #4
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Dammit! That's not the answer I wanted. Lol. Don't have another pump handy.

This is the pump
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So that's a normal amount of water pressure coming in the strainer?
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Old 05-23-2016, 08:35 PM   #5
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The water should be gushing out. You do have a clog or the seacock is not fully open. Try working the handle back and forth a few times, that might help to clear it.

Ok. Will try that.

Figured my shop vac trick would have dislodged whatever but guess not.
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Old 05-23-2016, 08:36 PM   #6
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That amount of water is way too small. It should, as I said above, be gushing out. You have a clog before the pump. The pump cannot efficiently suck water in, it pushes it out on the high pressure side.
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Old 05-23-2016, 08:47 PM   #7
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Again it may not be a clog before the pump.

That white plastic housing on your pump holds the impeller. It could be going bad, or there is dirt or shells etc. jamming it up.

That looks like a single application 120 volt pump. You can probably get a wet end replacement, with gasket. Frankly I would look to replacing the whole pump.

But first check that it is the pump.
Close the through bull. Disconnect the hose to the pump at the through hull side. Then slowly open the through hull. If you get an appropriate gush of water then your source is fine.
You can also then connect the hose again. Disconnect the hose of the ac side of the pump and have someone turn on the ac briefly while you watch. Be on the cell phone to tell them when to turn it off. If you don't see a significant flow, it is your pump and in all probability your impeller.
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Old 05-23-2016, 08:49 PM   #8
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I get no gush of water. Only a trickle.
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Old 05-23-2016, 08:51 PM   #9
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I get no gush of water. Only a trickle.
Where? When you disconnected the hose at the through hull side of the pump and opened the through hull?
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Old 05-23-2016, 08:56 PM   #10
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Menzies,
Did you watch the video? He's got the top off the sea strainer and the through hull opened and little to no water is coming out. Could the pump be shot? Yes, but he ain't gettin no water to the pump. If he puts on a new pump and no water is supplied he will likely ruin a new impeller/pump.
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Old 05-23-2016, 09:17 PM   #11
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Ok, that video means nothing. If the top of the strainer is at the same level as the water outside the boat, there isn't going to be much flow. IF the sea level is a couple inches above the strainer you will get all kinds of flow.

You may still have something clogging the through hull or the hose leading to the strainer. Put everything back together and disconnect the output hose of the pump, turn the pump on, and see if you have flow.

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Old 05-23-2016, 09:23 PM   #12
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Its not the "impellor". Thats a centrifugal pump, no rubber impellor and very very seldom does the plastic impellor wear out. He just aint gettin no watta. Just pull the hose off the thru hull and poke it out with a wood dowel. Unless it has an external strainer, then your gonna need to clean that.
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Old 05-23-2016, 09:25 PM   #13
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AC overheat

Stuck in water hose in it and that unclogged it. I guess the air from the shop vac was not enough.

Thanks!!
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Old 05-23-2016, 09:28 PM   #14
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OC diver is correct, if the pump and strainer top is above the waterline you wont get any flow. But,,, I assume it was working before, and most boat builders are smart enough to put the raw water supply below the waterline. I would think that if it has been working and now its not, and the water flow is minimal, that its probably a restriction on the inlet.
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Old 05-23-2016, 09:38 PM   #15
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I clean my strainer and exercise the seacock frequently, so when I encountered a high pressure fault on my 1-yr old A/C I was bewildered. It turned out to be a clogged condensing coil. There is a lot of silt and marine growth in my marina which passes easily through the sea strainer, but builds up in the coil. I now reverse-flush with water at 6-months and with Rydlyme at 12-months. The system is now 3-years old and cools like the day it was first installed. I called Dometic customer service who recommended the coil cooling regime for my area.

BTW, my sea strainer is about 1/2" below the waterline and looks just like the video. The flow is completely adequate when the pump is primed and running.

Good luck
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Old 05-23-2016, 10:21 PM   #16
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Almost wants to make one feed the AC cooling from fresh water.... hmmmmmmm.

Switchover valve? Hmmmmmmm
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Old 05-23-2016, 11:01 PM   #17
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Almost wants to make one feed the AC cooling from fresh water.... hmmmmmmm.

Switchover valve? Hmmmmmmm
Well that's one silly way to waste fresh water.
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Old 05-23-2016, 11:05 PM   #18
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Quote:
Originally Posted by cardude01 View Post
https://youtu.be/gZHSUl1sx88

So I'm getting a HP error on my Ac and very little water exiting outside the boat. Strainer clean.

I figured maybe something clogged intake at sea cock, but can't dive on boat. Blew back through sea cock with shop vac and got bubbles coming out of sea cock.

Does this look like a normal amount of water coming in an open strainer it do I still have a clog?

It should be gushing out.
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Old 05-23-2016, 11:13 PM   #19
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AC overheat

Yeah. The thru hull was clogged with something-- never found out what. I had no baseline knowledge of how much it should gush. After I unclogged it the water was really gushing out if the strainer with the cap off.

Now I know!!

Hard to get enough knowledge so you don't go chasing the wrong problem down the wrong avenue.
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Old 05-23-2016, 11:42 PM   #20
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I don't have any clamshells on my AC through hull. More than once I've had to extract a fish that took up residence in the hole.
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