AC Evap Box Drain? - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 08-06-2019, 04:56 PM Thread Starter
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AC Evap Box Drain?

Pretty sure the drain on the AC evap box is clogged, as I drive, the AC gets less and less cold, but if I turn it to just "fan" for a a few minutes, then back to AC, it will get fully cold again, for a little while. Furthermore, when I park the truck, condensate water continues to drip for at least half an hour, but at a very slow rate, certainly not what you would expect.

I've encountered this problem on other vehicles of mine before, and it was as simple as blowing out the drain tube or running a piece of wire through (and trying to dodge the deluge of water), but I can't seem to locate a drain tube/hose on this truck. It looks like water drips out of the lower seam of the box somehow, but I can't seem to figure out where it's supposed to drain from. Anyone got any ideas?

Thanks,
Trevor
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post #2 of 8 Old 08-06-2019, 05:09 PM
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Sounds like the core is freezing up with ice, cleaning the drain should help -- look for a "pucker" along the seam where the water drips out, there is no actual spout -- I would guess a critter has made a nest in the box and used the foam around the core for materials -- the foam forces air thru the core, rather than letting air go around(bypass) -- most likely have to pull the box and clean out the critter remains and reseal the core

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post #3 of 8 Old 08-06-2019, 05:11 PM Thread Starter
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Awesome, guess I'm not blind then haha. We get a fair bit of humidity here, so hopefully it's just some algae or other gunk up in there that I can blow out. Does the AC box come out from the cab or engine side on these trucks?
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post #4 of 8 Old 08-06-2019, 05:23 PM
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Not sure on that model, can you pull the fan motor from under the hood? and look in there -- you could get some algae killer from a home AC guy or try some bleach(careful not to spill it on the carpet/paint) -- one of those inspection cameras would be helpful, you can get a cheap one for your phone or tablet

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General note:
For all those wanting a premium silicone sealer Kubota 70000-73764 is the best your gonna find. This is a hybrid gray silicone that uses solvent rather than acid to start the curing reaction, this makes it safe for aluminum and and any surface that involves coolant.
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post #5 of 8 Old 08-15-2019, 09:56 AM Thread Starter
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Quote:
Originally Posted by Hydro View Post
Not sure on that model, can you pull the fan motor from under the hood? and look in there -- you could get some algae killer from a home AC guy or try some bleach(careful not to spill it on the carpet/paint) -- one of those inspection cameras would be helpful, you can get a cheap one for your phone or tablet
Awesome idea. I pulled the blower motor out (had to move the windshield washer tank aside), and got in there. Found a ton of decomposed leaves blocking the evap core, and some other nastiness. Scooped as many leaves out as I could and blasted everything else with my garden hose nozzle and compressed air until I felt it was clean. AC works a lot better now, though it still seems to be a bit lacking in slow traffic. Oh well, good enough for now. Also, I found the nylon vacuum hose that goes to the recirc door motor completely crumbled. The recirc door is spring loaded to default to "fresh", so it was pulling outside air all the time. I used a zip tie to hold the actuator arm in the recirc position until I can figure out what I should replace that nylon tube with.

Thanks again for your help!
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post #6 of 8 Old 08-16-2019, 06:25 PM
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You can get nylon tubing several places in bulk -- I would suggest McMaster Carr, they have all the cool stuff -- don't get side tracked ...lol

https://www.mcmaster.com/
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In my defense, I was unsupervised
.
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Torque Pro and OBDLink MX bluetooth monitor
General note:
For all those wanting a premium silicone sealer Kubota 70000-73764 is the best your gonna find. This is a hybrid gray silicone that uses solvent rather than acid to start the curing reaction, this makes it safe for aluminum and and any surface that involves coolant.
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post #7 of 8 Old 08-16-2019, 07:06 PM
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Quote:
Originally Posted by Hydro View Post
You can get nylon tubing several places in bulk -- I would suggest McMaster Carr, they have all the cool stuff -- don't get side tracked ...lol

https://www.mcmaster.com/
How the hell do you go to that site and NOT get sidetracked?
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Great link
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post #8 of 8 Old 08-26-2019, 09:45 AM Thread Starter
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Yep, that site is dangerous haha. Makes me want to fill my toolbox and empty my wallet at the same time...
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