944 water leaks interior

[djnolan]

What are the most common places for water to leak in to the interior of a 944 and get under the carpets and fog up the windows? I have checked the following and still have water problems.

1. Sun roof drains clogged
2. Battery tray rusted out

Any other likely places to check?

[944 Ecology]

Battery tray...

[Spring44]

Leaking heater core or hoses.

AC drain hose plugged and causing drain pan to run over

AC drain hose has come off of the drain pan and is running into the floor

Weather stripping around doors is leaking.

Battery box area has pinholes and is leaking into the floor boards.

Windshield weather stripping is leaking.

Sunroof drains are plugged.

[jcommin]

Those are the two most common -

[pfarah]

Yup, those two you mentioned although I did have the AC drain line disconnected in the cabin once (I forgot to reconnect it while working on the AC blower fan unit). Luckily I noticed the draining before it got ugly.

Have you checked all four sunroof drains for proper drain operation? I'll apply some air pressure to each of them every couple of years to verify they're clear.

Where are you getting water? Front or rear passenger floor or...?

Good luck on finding the culprit.

[djnolan]

If I lift up the back edge of the carpet in the rear seat floor, I find water/mold on both driver and passenger sides.

[PHillary]

Originally Posted by djnolan

If I lift up the back edge of the carpet in the rear seat floor, I find water/mold on both driver and passenger sides.

Repair that Battery Box ASAP!!!

I think the easiest fix is to clean it lay some fiberglass down sand it, prime and repaint it to match or make it black.

Another easy way to fix it is to clean it spray a little bit of flex-seal in there lay a fiberglass cloth over the flex seal and holes then put a heavy amount of flex seal on top of the cloth and the entire box let dry for two days an test with water after two days the box should drain normally out the side of the fender.

Problem solved!!!

[djnolan]

I recoated the battery box a year ago.

Could it be water leaking under the climate control air box? I had to remove it and break the seal to replace the windshield wiper motor.

[PHillary]

Originally Posted by djnolan

I recoated the battery box a year ago.

Could it be water leaking under the climate control air box? I had to remove it and break the seal to replace the windshield wiper motor.

How did you relocate the battery box??? Pictures please!!!

Also it doesn't hurt to re-examine any failure points the metal in that area could also be weak or have pin holes right now my solution to fixing those areas is fiberglass and/or flex-seal - that product is GREAT! for doing this type of repair work. Even if you suspect that it has a hole mask it off and coat it anyway just to have piece of mind???

and as others have said check your sunroof (drainage pathways) & hatch areas separation from the car or rubber seal going around the hatch....Until then garage or car porch it as much as you can. Wish I could help more but that's all I got. Sorry!

[djnolan]

No I re-coated it with POR-15 anti-rust coating:

https://www.por15.com/POR-15-Rust-Preventive-Coating

[Spring44]

My red 944 had a few tiny pinholes in the battery box and so I wire-wheeled that small area down to bare metal and repaired the pin holes with a layer of J_B Weld.

I then primed the whole area with Rustoleum primer and then applied 3 coats of Plasti-Dip rubberized coating. It is availablle at most parts stores, is a rubberized coating and comes in many colors. The red colored variety matched my red car exactly, so no further painting is necessary. My repair is still good after 4-5 years. Link Below.

https://www.usplastic.com/catalog/item.aspx?sku=38047&gclid=EAIaIQobChMI4IjKksD35gIVf__jBx2g_AT_EAQYBCAB EgLVvfD_BwE

[Ga 951]

I haven't seen anybody mention this one.

On my '88, I found a floorboard plug under the passenger seat that had become dislodged. There maybe one under the drivers seat as well (not confirmed). I pulled the seat out and pulled up the carpet. Then slathered silicone all around the plug and reinstalled it.

I assume you mean the fan box on the firewall (center). If you did not reseal it, I guess it could possibly leak water into the hvac unit under the dash and into the cabin. When I split mine, I resealed it with some urethane ribbon (windshield gasket material) between the 2 halves.

Hope you find the leak.

[PHillary]

Originally Posted by djnolan

No I re-coated it with POR-15 anti-rust coating:

https://www.por15.com/POR-15-Rust-Preventive-Coating

Ha Ha Ha!!! Recoated it...Lol!!!

I am dyslexic....

[djnolan]

Well I pulled out the front seats and lifted up the carpet to see how bad it was. Both rear footwells and the right front were very very wet. The insulation under the front right carpet was totally saturated, left front was dry. The rears didn't have insulation, just wet carpet. Removing the carpet was not that easy since Porsche glued it down almost completely, so I removed only the right front carpet section and the wet padding underneath to not tear or strees the carpet any more than needed.

Where was the water coming from? I hosed it down to see where water came in at.

I found two holes in the frame above the battery box and caulked them. The Safelite guy was at my next door neighbors (priceless) so I flagged him down and he applied a bead of window weld around the separated hatch frame/glass boundary. With that I think I have the majority of the leaks fixed but I plan to leave the carpet out for a few weeks to make sure.

Next will be to clean up the carpets, and replace or add insulation under them, reinstall, and fix/reglue the water damaged trim panel behind the sunroof and elsewhere.

I am wondering what the best insulation would be? And where to add it versus just replacing what was there already. Can anyone offer any recommendations?

Then on to reupholster the seats...

[djnolan]

So the rear leak was fixed with a new hatch seal, easy fix.

Now for the front, after tearing out all of the right front carpet and padding/insulation I found the leak shown.
It was not soaking the DME or harness, but it was soaking the carpet and padding.

Not sure even how to get to this from the outside so will attempt to seal from the inside with caulk.

Open to suggestions!

[djnolan]

I have put three coats of caulk on the leak and water keeps washing the caulk away. There most be a pool of water somewhere up above it. Grrrrr...

[Spring44]

dj, where is that leaky area in your picture located? It is like sort of like looking at a picture of the inside of your colon.....It is so close up that you can't tell where you are looking. Also, what is it with all of those distorted voids in the surface? Looks like it ought to be smooth sheet metal there with the only the seams caulked.

edit. Never mind, I see that the voids are just caulk with deep smears in it.

[djnolan]

The location is 13" forward of the door opening and directly above this is where the battery hold down bracket is. The water may be going under the bracket so I caulked under/around it using 50yr latex caulk. Hopefully this is the source.