I just encountered the same prob. traced it to the air intake on the engine side of the firewall. There is a crappy foam gasket where the HVAC box mates up to the hole in the firewall where the blower goes. The foam had deteriorated. I removed the pass seat, peeled back the carpet and poured a cup of water in the blower area...water poured in immediately. My fix was to slop a little blue RTV at the mating joint between the firewall and the hvac box. heres a pic. note...i DID say 'slop'. heh. prob coulda made it look better, but the reach is a little tricky. This is a 2000 xj, I know yours is a little different, but the concept should be the same. Hope this helps.

 

I also slathered RTV at the mating joint on the inside as well...but not until after I confirmed the leak was stopped outside the cab. I then wire-wheeled the pass floor pan and sprayed it with some Cold Galvanizing Compound I had laying around. Vac'd the water, put a fan on it overnight and put it all back together. Anyway...as I said, hope it helps. Sean

 

Okay ill check that and were is that at...? Just on the firewall?

 

Yes. On the passenger side firewall...in the engine compartment near the hood prop and just below the cowl. You will see a circular object protruding through the firewall, about 8" diameter. Thats your blower fan. You can test it for leaks by pouring a cup of water on it. First, pull your carpet back so you can see the floor pan, then pour the water against the firewall and go check your floor.

 

Alright! Thanks ill try that here soon. Can i just use some clear silicone? its what i got layin around.

 

Yea, I was going to use silicone actually...but the RTV was closer to reach..ha! I might recommend cleaning the area with brake parts cleaner or something to ensure good adhesion.

Another thought...make sure you apply the sealant at the junction between the hvac box and firewall...not solely or necessarily where the fan bolts to the hvac box.

lastly, you might want to take out your pass seat, prop up the carpet and put a fan on it for a while...as you know, our floor pans aren't exactly galvanized...heh.

i hope this is where your leak is located...easy fix and FREE!

good luck bud.

 

So is it the box thing behind my cylinder thing(ithink heater core) and under my wiper cleaner tank?

 

Your heater core is in the dash behind the glove compartment, you can't see it.

if you have AC, it will be near the accumulator... this:

Accumulator.jpg

your blower should look like this:

Blower Motor 1.jpg

there is a seal where the blower housing enters the firewall. that seal was causing the leak on mine. we had a bunch of rain yesterday and its bone-dry this morning.

take a pic of yours, i'll try to help.

 

There is also a drain for the AC, someone plugged mine, so water that came into the heater, ac unit couldn't drain outside and instead ran on to the floor.

 

I would say check the fresh air intake.

https://www.cherokeeforum.com/f2/wat...ng-cowl-34969/