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RAIN leaks onto passenger side floor... definitely NOT the heater core or windshield.

I have sprayed undercoating sealant everywhere I could on firewall side around the AC or anywhere hoses etc., go through firewall. Some VENT GASKET worn out?

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  • Master
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Randy Ohler is probably right.

You and a buddy can try to locate the leak.

  1. One of you (the skinny one) get in from the driver side and get down to see where water could be coming in. I'm not skinny. I would take the passenger seat out.
  2. The other take a garden hose and riun a small stream. Starting low on the car move the steam every place you can find where water could be coming in. Take your time. Check door seals, windshield seals, and rear window seals

Good luck..

Posted on Apr 05, 2015

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  • AC Master
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Year make and model? Some Gm's have a rubber seal that mounts to the body under the windshield cowling. It falls off letting water in threw the air vent/ filter. Silicone it back on.

Posted on Apr 05, 2015

Testimonial: "Randy, it is a 1992 Chevy G30 cutaway van (RV). When we first got the RV, I removed the cowling and sealed up some rusty spots under there and I don't remember any seal being out of place or anywhere water could get in at that area. I'll look again. Been fighting this leak for 5 years. Nearing the end of my patience now. If it weren't such a great running rig and very comfortable, I would have junked it long ago. Too much invested now. D Smith"

  • Randy Ohler Apr 06, 2015

    Don't look your is too old. I'll just go threw everything, I'm sure you already done some of these. Starting at the top, If there are any mounts going threw the cap seal them. Any on the flat part would most likely leak threw the head liner, But any on the slant in front could travel down to the trim and behind it to the floor. You might try remove the windshield trim and look for water trails. Next would be the door seals. They can look good on the outside part, but the part that clamps on the door frame could be bad. There are metal staples in it to clamp it to the door frame. They can rust and let the rubber loose the seal to the frame. Water getting in the top of it will travel down to the bottom center of the door, where the split is, flooding the carpet.This can be fixed with silicone. Next would be to check the seal for the windshield, You have to remove trim to inspect it. A heat gun works well with getting it loose Just not to much heat on the windshield. One other spot I can think of, But this usually floods the floor when moving own the road. There is an air vent that you have to pull the lever to open. Down by the kick panel.This vent should have a rubber flap on it. When this flaps disappears, water will get in the vehicle whether the vent is open or not and flood the floor. Again this usually only lets water in as you are driving. Oh, one other thing is rusts holes in the bottom of the body, But this is a going down the road thing also.

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