Weird water leak inside cab from vent fan - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 10 (permalink) Old 07-22-2014, 12:58 AM Thread Starter
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Weird water leak inside cab from vent fan

So I have been noticing water inside the cab of the truck on the passenger side. Then I notice there is water dripping from up by the fan that pull air out of the cab under the passenger side dash. When I started the truck with the ac on, water pretty much RUNS out. I have no idea how water would either get inside that fan housing. Everything looks dry under the hood. Could the AC condensation somehow be getting in there?

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post #2 of 10 (permalink) Old 07-22-2014, 10:37 AM
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Re: Weird water leak inside cab from vent fan

There is a small drain hole in the hvac box that is probably clogged. Look for a small snout sticking out of the cab. Its roughly behind the glove box under the evap case on the fire wall. You will have to get under the truck to find it. Just stick a wire or piece of coat hanger in it to open it up.
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post #3 of 10 (permalink) Old 07-22-2014, 01:22 PM Thread Starter
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Re: Weird water leak inside cab from vent fan

I will try that tonight. Thanks for the help!

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post #4 of 10 (permalink) Old 07-24-2014, 01:20 AM Thread Starter
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Re: Weird water leak inside cab from vent fan

Ok. So I found the little nub on the fire wall. I reamed it pretty good with a clothes hanger but nothing came out. It looks very clean when I look down it with a mirror and flashlight. Is there a valve in there that might be stuck preventing the water from draining? When the AC isn't on Max, the inside "flapper" is down and the water actually starts coming out of the bottom of the fan box. It definitely isn't draining out of that plastic nozzle. Thanks again for the help.

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post #5 of 10 (permalink) Old 07-24-2014, 10:41 AM
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Re: Weird water leak inside cab from vent fan

There is no valve or anything. The condensation is supposed to drain out of that drain tube. If you can pull the blower motor out you may be able to see if something is blocked up in there?
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post #6 of 10 (permalink) Old 07-26-2014, 01:50 AM Thread Starter
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Re: Weird water leak inside cab from vent fan

Pulled the fan. There is about an inch of water sitting in the fan housing. Can't see a drain. In there for the life of me. Even took a mirror and looked in the corners. I can't see where the water is supposed to drain out.

I hate when I can see a problem and can't figure out how to fix it.

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post #7 of 10 (permalink) Old 07-26-2014, 10:36 AM
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Re: Weird water leak inside cab from vent fan

Just a thought, does draino hurt plastic?
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post #8 of 10 (permalink) Old 07-26-2014, 10:39 AM
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Re: Weird water leak inside cab from vent fan

It should be under the evaporator. That is the finned aluminum piece to the inside of the fan area, right behind the blower resistor. Check along the bottom over there? Might also try to flush that side out with a hose. Your interior may get wet, but it already is anyway.
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post #9 of 10 (permalink) Old 08-01-2014, 02:05 PM
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Re: Weird water leak inside cab from vent fan

Quote:
Originally Posted by mattmankow View Post
Just a thought, does draino hurt plastic?
No. but you do need to thoroughly rinse the item that has draino on it.

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post #10 of 10 (permalink) Old 08-02-2014, 05:49 PM Thread Starter
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Re: Weird water leak inside cab from vent fan

Well, I figured it out.....
Ended up taking the glove box out and opened up the cooling coil. Found the drain, and it is definitely not clogged. It was clean as a whistle and there was no water sitting in there. Did some more searching on the internet and found there to be a common problem with water accumulating in that fan housing. What seems to happen is water drips down from the mounting screws from the windshield housing above. I took the shroud off and made sure both the fresh air intake seal was sealed up good with some sealant and that the clips were sealed well. The other big fix people had was to drill a small 1/4" hole in the bottom of the fan housing to prevent the water from accumulating and running into the cab of the truck. If you think about how your A/C normally pulls from the outside, this 1/4" hole will not affect anything. People have done it and reported no issues anymore.
Sooooo, between caulking the clips for the hood shroud near the windshield and this little hole, I think I have it fixed.

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