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Old 07-13-2018, 12:16 PM   #1
bmdubya1198
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Default Hole on bottom of fan motor?

Well, I finally found where the water was coming into my car, but now I can't decide on how to fix it.

Are these holes on the bottom of the fan motor necessary? Can I just silicone them? The one that's circles is where the water is leaking in, but I don't know if I seal that one if it will leak in from another one.

It appears there is a drain hose of some sort up higher on the housing, but I don't know how effective it could be. And obviously I don't want the water just sitting in the fan and damaging the motor.

Should I just make a drain hose for one of these holes or plug 'em?


Pic:https://photos.app.goo.gl/xFiRTu483ybjp5Zd9
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Old 07-13-2018, 02:48 PM   #2
PCH
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If water pools up inside the motor's housing then the bearing is not going to last. So you gotta let the water drain out. How it gets there in the first place is another question. Something is wrong under the cowl?
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Old 07-13-2018, 02:52 PM   #3
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Why not ... you know ... actually fix the problem ?
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Old 07-13-2018, 04:25 PM   #4
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I've been wondering that myself... how does the water even get in there? I sealed the black plastic shield over the fan under the cowl, and water is still getting in.

I've heard that it's normal for water to get in there. Which seems odd to me too, but I don't know how to prevent it.
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Old 07-13-2018, 05:52 PM   #5
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... edit

sorry dont know the heater layout of a 740
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Old 07-15-2018, 04:33 AM   #6
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Normally the fix for this is the one you did-- correctly positioning and sealing the plastic cover piece under the hood-to windshield transition cowling. Evidently your problem is somewhere else, likely limited to the windshield or body seam or thru-bolt under the cowling. Looks like you will have to test it yourself. Use the hose or watering can to drench different areas and watch for which area corresponds to the leaking water. Start low first (i.e. drench the cowl insides first).
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Old 07-15-2018, 09:25 AM   #7
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I'll have to do that at some point. It could very well be the seal at the windshield, but it's hard to see for sure.
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Old 07-15-2018, 05:41 PM   #8
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That's an aftermarket fan motor. The original type would be a better idea imho.
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Old 07-15-2018, 07:13 PM   #9
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Quote:
Originally Posted by lummert View Post
That's an aftermarket fan motor. The original type would be a better idea imho.
Figures... lots of things were done to this car that are questionable.
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Old 07-19-2018, 05:20 PM   #10
dl242gt
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There is usually a drain hose in the system as you mentioned. They get clogged. A clear drain is a big help with the heater system staying dry.
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