I can't seem to locate the exact thread, but the copy of it I have shows how to use a furnace blower to make a "sealtech" machine, i.e., to pressurize the AS. Then, by spraying soapy water on the seams, you can locate the leaks.
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We have been getting ready for another Big Adventure and one of the items on "The List" was to find a stubborn leak.
Being lazy and wanting to try a new home-made gadget...I did a DIY pressure leak test...
220V blower out of an old central heater, some duct tape, a bucket and some wood...
I didn't even have to tape the stove vent...air was whistling and howling from everywhere and there was still enough static pressure to find the leaks. Now that I think about it, the bathroom vent is was open!
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I can't seem to locate the exact posting, but I plan on buying a 400-cfm blower and attaching it to some plywood which I will place over an open storage bin. This will slightly pressurize the cabin and by using a spray bottle with soapy water, I'll spray the seams looking for the tell-tale bubbles that indicate a leak (remember how you fixed inner-tubes of flat tires). I figure I can assemble one of these contraptions for about $125 - far less than what you would pay to have it done at an RV dealer who has the machine (priced at about $150/hr) or to buy a real seal-tech machine - about $3,500.
1987 Excella 32-foot
1999 Dodge Ram 2500HD Diesel