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Old 12-14-2011, 10:57 PM   #1
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Draining the fresh tank

N a 2008 Cardinal 36. It is a four seasons model so the bottom is skinned. I opened everything hanging under the trailer, it does not drain. Any ideas?

Where is the tank located?
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Old 12-21-2011, 06:57 PM   #2
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On my Cardinal 2007 37RK2- there are several low point drain looking valves on the rear of camper "bottom" Make sure you have water in your fresh tank! On mine the first time I tried to drain my fresh tank I had no water in tank. There is another drain near that area. I just kept opening drain valves until I had fresh water draining. Too bad you have not have more replies.
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Old 12-21-2011, 09:15 PM   #3
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Been there. This is my 12th RV. I have opened the 3 outlets. Even put 5 psi of air to the fresh tank with the vent plugged. No water or air anywhere. The panels are coming off the bottom new years weekend.
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Old 12-22-2011, 12:44 AM   #4
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First off, do you have water in the fresh tank? How do you know? Since you have all the drains open, have you added water to the fresh tank and watched if it drained. We sell Cardinal 5th wheel mainly, and the fresh tank is below the fresh tank fill.

The bottom must come off in order, as it is like a tin roof. Good luck.

If you are reading the monitor panel, it may not be accurate.
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Old 12-22-2011, 09:07 AM   #5
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Since I bought the trailer used, I wanted to flush the tank out. Filled it. Took about 45 minutes. Panel showed empty when I stated, showed full when finished. Opened the drain line under the fill hose. Nothing came out. Opened the others, same thing. It still shows full.
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Old 12-22-2011, 12:45 PM   #6
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are all the lowpoint drains exposed underneath the trailer?
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Old 12-22-2011, 03:39 PM   #7
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Could it be the tank drain valve is clogged?
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Old 12-22-2011, 08:44 PM   #8
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are all the lowpoint drains exposed underneath the trailer?
That's why I am going to remove the metal sheeting under it. To see if everything is where it should be.
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Old 12-22-2011, 08:45 PM   #9
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Could it be the tank drain valve is clogged?
All of the drains I have run water. They are shore lines because when I hook my air tank to the hose fitting, they all blow air when the lines are clear.
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Old 12-22-2011, 10:43 PM   #10
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Blowing air through the city water connection does nothing to the fresh tank. You are not looking at at a drain somewhere, or it is clogged. On a Cardinal, usually three with white handles The fresh water drain won't be far from the fill. When you opened the drains, did anything come out? Did you leave it open a few hours /

. Good Luck.
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