2005 G35 water leak?

[stillfeelme]

I have a used 2005 G35 sedan that appears to be having a water leakage issue. I park my car on a incline front end up at home. So I noticed that I had damp carpet mats on the passenger side front but the most damp area was the rear seat mat on the passenger side after a overnight rain.

I checked the sides of the doors and that area isn't wet. The sunroof isn't wet and the seats are not wet. So I have come to the conclusion that the leak has to be coming front the front and forming a pool under the carpet. I have done a search and I could not find anything on this for a G35.What can I do on my own to fix this? Is there supposed to be a drain somewhere to allow this to drain to the ground?

Any help from some of the experts on here would help me out.

Thanks

[GseaQ]

I have no G model experience, but helped a friend trace a similar leak on his LeBaron ragtop. We found a couple of things by using a garden hose. There should be drains - with or without hoses - at the base of the windshield allowing the rain to drain "through" the body to the ground.

On his it was an opening under the cowl for the water to flow down inside the fender behind the wheelwell. At the bottom there was an opening into the front of a boxed channel behind the rocker panel although the opening was well above the base of the channel. At the rear side of this boxed channel in front of the rear wheelwell there is an opening with a rubber flap that should allow water to run out but not in.

Well, the opening at the front lets leaves and crap into the boxed channel which blocked it so water couldn't flow out the rear opening. Once full of water, it started to leak into the interior through an overlapping welded seam in the boxed channel that wasn't completely sealed.

There may also be drains at the rear of the car for the sunroof to check.

Good luck,Glenn

[stillfeelme]

GseaQ,

Thanks for responding. I don't really have a lift to get under the car. I did get under the car yesterday barely but I couldn't see anything that would be blocked. Maybe there is a blockage somewhere that I can't see. I took a hose and ran it all around the car around the sunroof and all. I will give it another try hopefully tommorow. I think I may be forced to take it to a dealership to see if there is anything that they can do. Is there a way that you or anyone knows I can look up the actual drain design probably not. Highly unlikely unless someone has a service manual online.

[GseaQ]

Here's a service manual.

http://www.nicoclub.com/FSM/G3...Sedan/

[bullittandy]

Has the windshield been replaced?

[Maniac0908]

I got the same problem. did u find out what it was? someone please help me. i dont want it to start to mildew.

[Q451990]

Make sure your A/C evaporator is draining before you spend much time searching for other sources of water. With the cabin filter I assume it's not as common as older models, but it's still possible that some sludge could build up in there I guess...

Heath

[SteveTheTech]

Welcome to Nico,

I can relate on just how frustrating water leaks can be both as a tech and owner. My J leaked terribly from a missing trim piece under the hood cowel (the plastic piece under the wipers), I patched the hole and the leak was solved. At work I have seen everything from clogged sunroof drains to gaps in the windshield.

This is not necessarily a hard thing to find. It usually comes down to have 1/2 of the interior removed while laying on the floor(with the carpet pulled back). Before you start removing things you may want to test the sunroof drains, there is a pretty easy test for this. With the sunroof open pour a small amount of water into the right track. I usually use a 16oz water bottle or something similar, pour slow so it doesn't overflow into the interior. After pouring the water get out of the car and watch for water to drain from the front and rear vents located inside the body you will see a small stream of water coming from the area behind the right side wheels. If the car is parked on a flat surface water should flow at the same rate from both vents, if the front one is slower than the rear it may be clogged. Compressed air blowing into the vent in the sunroof track can usually free up the debris in there.

It could also be from a damaged bulkhead harness cover. The first thing I would do is remove the battery cover and look at the heater box, look for any cracks or damage. Also give the harness a tug from the top to see if the fit is tight and water proof.

[Maniac0908]

its definatly not from my a/c. its been raining hard here in MD. I did install a amp and ran the wire through the big harness near the battery down the passenger kick panel. but i dont see how that could be it. im gonna try pouring water down the sunroof. are there any drain pipes on the front window?

[Maniac0908]

just in case im wrong and this could be the problem. how do i check?

Make sure your A/C evaporator is draining before you spend much time searching for other sources of water. With the cabin filter I assume it's not as common as older models, but it's still possible that some sludge could build up in there I guess...

Heath

[SteveTheTech]

I did install a amp and ran the wire through the big harness near the battery down the passenger kick panel. but i dont see how that could be it. im gonna try pouring water down the sunroof. are there any drain pipes on the front window?

There you go I will bet you a beer that is the source of your leak. If you put a hole through a rubber seal to run a wire you need to seal it. Go to your local parts store and buy some RTV (Room Temperature Vulcanizing) silicone, I recommend black as it tends to adhere the rubber in the bulkhead boot to the insulation on the wire.

When installing amp wires it is easy to forget that of all the water that runs down your windshield a fair amount ends up under the cowl and is just looking for a way in.

I wouldn't even bother with the sunroof test until you have sealed the Amp + wire hole.

[Maniac0908]

There you go I will bet you a beer that is the source of your leak. If you put a hole through a rubber seal to run a wire you need to seal it. Go to your local parts store and buy some RTV (Room Temperature Vulcanizing) silicone, I recommend black as it tends to adhere the rubber in the bulkhead boot to the insulation on the wire.

When installing amp wires it is easy to forget that of all the water that runs down your windshield a fair amount ends up under the cowl and is just looking for a way in.

I wouldn't even bother with the sunroof test until you have sealed the Amp + wire hole.

a

ok cool. im gonna try that. ill let u know.

[Q451990]

I agree that the amp wire is a very likely cause. My truck is a former fleet truck that had a 2 way radio installed in it. They put a power wire right through the top of the main harness boot on the right side of the firewall. It made a perfect funnel to trap the water dripping off of the hood hinge. I pulled the wire and sealed it with the black RTV as Steve recommends and that cured it.

The fun part was that they had obviously tried all kinds of things to diagnose a water leak on that side, including ramming a flat-blade screwdriver straight through the A/C evaporator...

Heath

[g35guy86]

Im having the same issue in my 2006 G35 coupe. Did anyone find a solution to this yet? I also ran my amp power wire to the battery.

[SteveTheTech]

There you go I will bet you a beer that is the source of your leak. If you put a hole through a rubber seal to run a wire you need to seal it. Go to your local parts store and buy some RTV (Room Temperature Vulcanizing) silicone, I recommend black as it tends to adhere the rubber in the bulkhead boot to the insulation on the wire.

When installing amp wires it is easy to forget that of all the water that runs down your windshield a fair amount ends up under the cowl and is just looking for a way in.

I wouldn't even bother with the sunroof test until you have sealed the Amp + wire hole.

This should also apply to you. Check the routing of your amp power lead.

[loystock]

I addition to sealing the power feed to your amplifier, you must make sure that:-you have a fuse in series with the power feed before it enters the firewall.-the section of the power feed on the firewall must be properly insulated.

In addition to water seepage, improper routing of a power feed can be an electrical/fire hazard. Over time, the insulation of the power feed in the firewall slot will get stripped causing short circuit, unless it is properly protected. Your insurance coverage may also be adversely affected..