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720 leaking water into cabin from blower motor?


Draker

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I've got the interior ripped out of the 720. I noticed a few wet spots when I was pulling the carpet out and so I started to do some leak checks. Found a steady stream from the blower motor. I removed the blower motor and I can see it looks like it's coming in from the vents in front of the windshield. I've got the vents off from the lower part of the windshield but I don't see anything standing out at me. I'm going to dig in deeper..

 

Are there drains that might be plugged? I can't see anything at this point. Any information here would be helpful.

 

Thanks.

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On a 720, the blower motor isn't anywhere near the heater core and the duct to it is above the level of the core. So no worries there.

 

Look in your factory service manual in the heating & ventilation section. Your firewall/cowl sheet metal may be rusted and letting rain water in. Normally it runs out drain holes, but if those get blocked eventually it rusts out.

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I got a good look in there.. cleaned out a TON of pine needles and a rat nest. The vent is a bit rusted where the it enters the cab and blower motors assembly. I can't tell if it's rusted through, but it's pretty rusted. I found the drains were completely plugged.

 

My plan is to get some silicone and seal everything I can. Not sure what I should do about the rust. What should I do to try and seal it up?

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It's likely fine now. If the vents ate plugged or restricted the water will back up and on corners can slop over the lip and into the blower air entrance. If there are pine needles and maple keys in there as well it will act like a wick and pretty much do the same thing. Get some fiberglass fly screen and double side tape it to the undersides of the cowl under the open louvers to keep them out.

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on the odd ocassion i get water in the cab, never thought to look there. i normally just park under shelter

 

Yeah, it's not a ton of water, enough to get things rusting.

 

I'm waiting for some dry weather so I can get this thing patched up.

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