02 Grand C, Water on Passenger Floor

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D - 02 Aug 2007 20:42 GMT

Hi All,
After going through the fix for A/C condensation water on the passenger
side floor of my 1993 Grand Cherokee, I found today that I have the
water problem in my 2002 Grand Cherokee.
Is the fix nearly the same? The components are different so I thought
I'd ask before drilling into the drain system.
Thanks
D

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The Reverend Natural Light - 02 Aug 2007 21:37 GMT

I can't help you on the '93 since the '96 I owned for years never had
any related problems. I've now had the whole HVAC unit out of my '99
two times and I can't imagine what you're planning to drill.

The HVAC box has a plastic tube that sticks through the firewall low
on the passenger side. Perhaps yours is plugged. Aside from that,
there is a service bulletin about water on the passenger floor.

The design is very simple. The drain is about two inches away and
downhill from the evaporator core. Unplug it. There is a foam gasket
that fits the firewall around the tube. Check it out.

> Hi All,
> After going through the fix for A/C condensation water on the passenger
[quoted text clipped - 4 lines]
> Thanks
> D

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D - 02 Aug 2007 21:49 GMT

I'm sorry I wasn't clear. I don't own the 93 anymore, but I did have the
problem on it. I own the 02 now with the same problem cropping up.
The 'fix' on the 93 was to drill a hole into the round plate from the
inside passenger floor wall and probe from the inside with a coathanger
to unplug it. I wanted confirmation before I drill into the 02 plate
that the fix is the same.
The foam between the round plate and the firewall is in place and is
sound, although wet now of course.
There is no 'unplugging' that I see without taking the entire unit. The
round plate is solid against the firewall.
Thanks for your help.
D

> I can't help you on the '93 since the '96 I owned for years never had
> any related problems. I've now had the whole HVAC unit out of my '99
[quoted text clipped - 16 lines]
>> Thanks
>> D

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Will Honea - 02 Aug 2007 23:52 GMT

> I'm sorry I wasn't clear. I don't own the 93 anymore, but I did have the
> problem on it. I own the 02 now with the same problem cropping up.
[quoted text clipped - 7 lines]
> round plate is solid against the firewall.
> Thanks for your help.

I can't speak to your specific model, but I have used a water pic to clear
the drain. Ram the hose up the drain outlet from underneath and let it
rip. You can make a pretty good mess in the process, but the spray from
that little dental pump is strong enough to break up the accumulated crud
and wash it out the drain. I use the same method when I start to get a
sour smell out of the unit - just add a couple of teaspoons of bleach to
the water

Signature

Will Honea

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The Reverend Natural Light - 03 Aug 2007 16:39 GMT

> The 'fix' on the 93 was to drill a hole into the round plate from the
> inside passenger floor wall and probe from the inside with a coathanger
> to unplug it. I wanted confirmation before I drill into the 02 plate
> that the fix is the same.

>From the sound of that 'fix', there are too many differences between

the 93-98 and 99-04 models to apply the same procedure.

Use the coat hanger to dig around inside the tube that protrudes
through the firewall. Then hit it with a shop vac. And don't dig
around too far bacause the evaporator is only a few inches away. 2-3
inches is as far as it needs to go.

You're making a big mistake if you drill a hole in anything on that
model.

Worse case, it really isn't that hard to pull the whole HVAC unit
out. If you haven't done the blend doors yet then you'll have it
apart eventually anyways.

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Herb Leong - 08 Aug 2007 11:02 GMT

#Worse case, it really isn't that hard to pull the whole HVAC unit
#out. If you haven't done the blend doors yet then you'll have it
#apart eventually anyways.

Uh, define "it really isn't that hard..."

http://www.wjjeeps.com/hvac_sub_assembly.htm

And the above certainly is not my definition... =)

/herb

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The Reverend Natural Light - 08 Aug 2007 19:31 GMT

> Uh, define "it really isn't that hard..."
>
> http://www.wjjeeps.com/hvac_sub_assembly.htm
>
> And the above certainly is not my definition... =)

It is total cake, especially with those instructions. It may be 50
pages of instructions, but follow them step by step and most
everything comes out in one piece and it all fits back together
perfectly. It took two days the first time and one day the second
time. $2k at the dealer is robbery.

Real pain is changing the heater core in a Ford Taurus.

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