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I have a fiberglass circular home AC unit that has a water leak. What do I seal the pan with?

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Hi,
Clean and then dry the pan with a hair dryer... then take clear silicone caulk and seal the hole or crack...then let the caulk setup for 12 hours before starting the unit and getting it wet...simple fix...
Have done this many times...

heatman101

Posted on Apr 23, 2010

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I have a 2013 keystone cougar 327res and the belly pan is full of water...where should i look for my leak?


This is not just for your camper, but general troubleshooting.
Drain the water from the belly pan. Hook up water supply to shore water source. With water source turned on, allow some time, 1-4 hours, and check if water has returned to belly pan. If water is present then the problem is with the fresh water system. If no water, either it is a small/slow leak or the problem is not with the fresh water system. Next test the grey water tank by pouring some red food color into the shower or sink drain. Flush it into tank with water. Again, wait for some time, maybe over night, and then check for red water in the belly pan. It may take longer for the leak to appear as the grey water tank does not have pressure. If no water, check the black water tank with green food coloring and same technique. If there is colored water, red or green, in the belly pan, then the leak is with associated with the grey or black water tanks. If no water is present after these tests, then the leak may be very small and it may take days or weeks to have water re-appear. In any event, clear water is fresh water system, red water is grey water system, and green water is black water system. With any of them, checking the tanks themselves and all pipes and connectors to/from should find the leak source. The last possibility is that water is entering the belly pan from a roof or vent leak. Check to see if water returns to belly pan after a good rain. If so, the water may be clear or slightly dirty. If it is a roof leak, I have found the best repair is to use Peel and Seal roll roofing It is light weight laminated aluminum and self sticking. Cutting and applying narrow strips 4-6" wide, will seal any caulked area. It costs $95 (3' x 33') at Lowes. A 30" motor home can be completely covered with three (3) rolls, in half a day. I have re-topped 5 motor homes (one 7 years ago) and no more leaks on any of them. The product was developed to seal the roofing joints of mobile homes. Topping should last 15+ years.

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My coleman air conditioner 7300 series is leaking water on the inside


Water in an air conditioner is generally condensation building up on the indoor coil. This happens when the temperature of the coil is below the current dew point of the atmosphere. You have possibly two issues going on.

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2) excessive water can be an indicator that you may have a slow leak in the refrigerant system. reduced pressures will lower the temperature of the coil causing it to condense more water, more frequently. While you might enjoy the seeming better performance of the unit, if there is a leak it will eventually reach a point where the water will freeze(cutting off the air flow so no cooling) and eventually stop working altogether. Have a certified technician check your system for leaks. Remember that most rooftop units use R-22 refrigerant, not R-134a automotive refrigerant. The wrong refrigerant in the system can be very damaging to components and seals, and can cause the unit to function improperly.

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My ac unit is leaking through the coil box, I cleaned the drain, but it still leaks from the side of the box. Could it be cracked? the unit is 9 yrs old


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1 Answer

Water leaking at bottom of cylinder.out side of pipe at bottom.


Depending on age and condition, If you don't see any noticable leaks where pipes are fit on top of the tank, you will more than likely have to replace the heater. Try turning the power off to unit and remove the inspection plate(s) on the side. See if you can tell where the water is coming from. If you see it is leaking around the element(s), you may want to try to remove the element(s) and apply teflon tape or sealant to the threads and re-install, do not over tighten. You may have a crack in the fiberglass tank. Water is leaking down into the metal tank which is a protective cover for the fiberglass tank that stores the water. The pipe at the bottom is probably the drain for the tank. If you are going to try to re-seal the elements, you will definately have to cut the power nad drain the tank first.

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I HAVE A 5000 BTU G E WINDOW UNIT I PURCHASED AT LOWES LAST YEAR, IT DRIPS DOWN OVER MY PATIO IS THERE A WAY TO INSTALL A DRAIN ?


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The tank on the mastercool is beginning to rust out. Is there an available fiberglass insert for these tanks, or do we need to use mesh and mold it in place?


I have wondered this myself. The Mastercool has inherent weaknesses in the pan where the metal sides and bottom tray meet. Of course they are not manufactured with a fiberglass tray because they would last too long and therefore reduce profits for replacement coolers. I have found that the bottoms of the pans rarely rust because they are constantly under water, not exposed to the air, and also accumulate a buildup of minerals that actually protect the metal. It seems that water gets in the seams and along with the exposed metal at the waterline, rusts out primarily in the end corners. I know of no fiberglass insert but am currently working on three rusted units by using fiberglass cloth and resin and filling holes with good ol' regular automotive Bondo. I am particularly making sure that it is totally sealed so not water can get past the pan. It will take a year or two to find out if this works.

I have also considered cutting off the old pan and having a local HVAC shop fabricate a new one using stainless steel or aluminum. This might be a little costly but would save time compared to reworking the old one with fiberglass cloth. I have been successful in obtaining used metal including SS sheets from the salvage yard very economically. The cost would be in the simple fabrication of the tray and any welding required to make it watertight. I might try this down the line if the fiberglass retro doesn't work.

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1 Answer

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the drain pan is either clogged or the unit is not mounted properly. If the drain pan is clogged simply clean it and the problem goes away. In the case of the unit mounting, check the angle of the unit and the drain pan inside, if it tilted to the front even just a little then water would leak. the drain pan should lean toward the drain and away from the front.

I hope this helps.

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