H3 Cabin Air Intake Leaking

[Wh!te06]

Hey Hummer world ...

I've had some water under the carpet on the passenger side floor. I did some investigating, it's not the sunroof drain but I think water may be coming in from the cabin air intake. Has anyone had this problem and fixed it? I'm not sure if it's coming through the mesh screen or around the seal since it seems to be leaking down the firewall. Some water collects on the outside of the blower motor housing.

Why GM would position this piece where the water flows on or near it and not raise it, is beyond me.

Thanks for the help if ya got any!
FYI. ... this is my first post.

 

[scoreh3]

Welcome to H40 . I haven’t had that issue so I’m not going to be of much help on this one. I just wanted to welcome you to the group.

 

[Wh!te06]

Welcome to H40 . I haven’t had that issue so I’m not going to be of much help on this one. I just wanted to welcome you to the group.

No worries scoreh3, thanks for welcoming me to the group. Hopefully someone here has come across this issue.

 

[alrock]

I have to say its the first I've heard of it too but I'm sure someone will chime in.

 

[Wh!te06]

I have to say its the first I've heard of it too but I'm sure someone will chime in.

Thanks, yea even if someone knows of something else and can share other possibilities ... I'm all ears, this seems to be the most likely thing to me.

I also had a leak in the rear but I found roof rack rail bolts missing. Those bolt holes open straight into the frame. Great design too

 

[Traxx]

Has the windshield ever been replaced? Unfortunately, poor installation seems extremely common.

 

[Wh!te06]

Has the windshield ever been replaced? Unfortunately, poor installation seems extremely common.

I've had it for 6 months now, I don't know the full history. I didn't realize the windshields have been known to leak after replacing. Im not sure how the water would come in around the windshield there, I'll have to check out the seams on that side.

 

[Jeepwalker]

Some water collects on the outside of the blower motor housing.

Are you talking about on the HVAC housing on the 'Inside' of the cabin?

Maybe the best thing is to have someone work a hose on the outside of the vehicle. Start in one area and gradually move across to the other side of the vehicle. Start low first and if you don't spot any leaks, then move up higher towards the top of the windshield. Don't start at the top b/c you won't be able to isolate it. Take a look at the area where the HVAC box meets the firewall in the engine compartment -- looking for cracks or anywhere where water could enter. You know there's a sunroof drain on both sides, right?

Is there a gasket along the back of the engine compartment to seal the rear of the hood?

Any possibility the AC condensate drain is plugged? I had insects build a mud-nest inside the rubber drain tube of an hvac box once (different make of vehicle) and it completely flooded the floors.

Let us know what it turns out to be. Best of luck

 

[RamRod]

I have not had this happen to me, but after the windshield I would double check that it is water.

Is it possible that this is a coolant leak from the heater core? (just throwing it out there)

If it is coolant it will have a sweet smell to it

 

[Thatsgr8]

Did you ever find out where the water was coming from? I picked up my H3 this past Monday. My daughter told me mine was leaking there last night. It is not antifreeze so no worries there. I am sure it happened while they were running the A/C. I have not looked into it yet. But I am almost positive it is the A/C drain tube is clogged and not leaking the moisture drain. As soon as I locate it then I can fix it.

 

[Happy Hummer]

Check to make certain your drip line for the a/c system is not clogged. Also pull the cowl and check to make certain nothing is clogged in that area. I know when I had my H3 apart at the cowl it had junk and gunk down in the area.

 

[Clark]

It could just be the drain tube from the sunroof. under the dash there is a rubber grommet plugged into the firewall.
if the drain hose has detached from it your going to have a big puddle of water on the passenger side.
look on youtube there are a few posts for that problem.

 

[USMC_315]

The vents/plastic trim in front of the windshield that surround the wipers lead to the HVAC intake and can clog easily apparently. I had this issue before myself, all it took was a decades worth of pollen