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Old 06-05-2010, 08:38   #1
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How to Flush A/C Cooling Water

Is there a way and or chemical to flush the raw water tubing on a Crusair unit?
The panel is showing a high pressure message and there is very little water flow from the thru hull fitting.

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Old 06-05-2010, 08:48   #2
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A few days ago I came across a water line blocked from the AC water pump to the thru-hull outlet.
The boat had been on the hard for 2 years. Using a dock water hose we blew the obstruction out the thru hull...a mud wasp nest perhaps?


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Old 06-05-2010, 09:08   #3
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Ronbo may have hit it. Disconnect both the intake and discharge lines and blow them out with a hose.

If that's not it, you can back flush the condenser with RydLyme (Apex - Rydlyme is the world's leading biodegradable descaler, rydlyme is designedto dissolve water scale, lime deposits & rust deposits, but is not water treatment orwater conditioner. ). First back flush the heat exchanger with fresh water and then mix a gallon of this with a gallon of fresh water in a 5 gallon bucket. You can use a $30 submersible bilge pump to circulate the mixture from the bucket, through the discharge side of the heat exchanger line and then back into the bucket. Let that run for an hour or two to thoroughly dissolve any scale that may have built up in the lines. The stuff is non-toxic and bio-friendly so you can pump it over the side through the discharge lines when you're finished. (Let it sit in the discharge lines overnight to get rid of any debris that may have built up there.) You should be good to go.

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Old 06-05-2010, 09:32   #4
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Rydlyme is a great product. We have had good results using plain old CLR over the years using svhylyte's method. We don't run it for an hour or two, just enough to flush the lines a bit. Then we let it sit for several hours. We remove the intake line, stick it in a bucket and let the AC pump do the work. No need for another pump or any type of re-plumbing. We are always amazed at the gunk that come out afterwards, even doing this once a year.
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Old 06-05-2010, 11:03   #5
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I would also highly recommend purchasing a surfboard leash that surfers use to teather their board to their ankles. Cutting away the end fittings gives you a soft plumbers "snake" that can be run through your coils without damage. I've used this along with the hose flushing to keep my Cruisair running efficiently. 'take care and joy, Aythya crew
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Old 10-05-2010, 07:27   #6
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Thanks for everyones help, she is blowing cool again
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Old 10-05-2010, 11:43   #7
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Before doing that, follow this procedure:

Remove the hose exiting the pump with the unit off. Have someone turn on the unit. Right when the water starts blowing through hard, jam the hose back on.

More often than not I see people thinking their unit is clogged when in fact, it is a vapor lock. I am not saying that you are not clogged up... but we RARELY see that if ever. Typically it is a vapor lock. Regardless, following what I said should allow the water to push back through. if not, it has cost you nothing but a few minutes. It is important to take the hose all the way off though to get a good hard flow. Try that first.

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Old 18-05-2010, 20:48   #8
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For others, there are muriatic acid solutions that contain chemical dye indicators made specifically for "de-scaling" AC systems. You disconnect the supply and outflow hoses and attach them to a bilge pump inside a five gallon pail. Then you fill the pail with the de-scaling solution. The pump continuously circulates the solution into the AC unit and then back to the pail. The color will change when all the build up in the tubing has been removed. An alternative is to use muriatic acid or commercial de-scaler chemicals and just run the pail-pump system for half an hour.

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