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Old 29-03-2009, 13:45   #16
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Originally Posted by mrfordsr View Post
I have a 2001 50' Gibson with two separate cruisair a/c units. The cooling water outflow on one has decreased to about 60% of the other one. The unit with the lower flow runs briefly and cycles off, shows a "high pressure" message on the control panel, cycles two more times with the same message and then shuts down. I have cleaned the strainer. That did not improve the outflow. Do I have an impeller problem? If so, can I replace the impeller or should I order a replacement pump? I am a novice large boat owner. I would appreciate any advice. This is my first post.

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Old 30-03-2009, 17:48   #17
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Location: South East Asia
Boat: 122 year old Historical Sailing vessel
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Loads of good advice here this is a great thread. There are several possible sources of problems here. yes you could need an impeller change which is easy enough just do remember to lub the new impeller before you install it. The inlet and outlet hoses can be blocked with growth even inside the boat. I have had that problem happen where it almost completely blocked hoses. The outside strainer on the thru hull could be blocked. and lastly you could have growth inside the actual heat exchanger coils on the unit. I would first confirm that the ubit is properly gassed up, then start at the inlet and verify each step the water takes. and good luck I hope it is a crab that has taken up house keeping in the strainer.

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