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Unread 07-14-2012, 10:57 PM   #1
bluejunior
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air conditioning woes

So I live in Texas, I love my AC, and until recently it has loved me.

The unit back in the dash that directs air to all the different vents is having issues, I can't use the recirc or hi and low air condition settings anymore, because it all just blows straight out of the windshield vent, which of course drags it through the sunlight and kills the cold factor quite a bit.

Point being, I need to replace that part of the ducting and I'm wondering if anyone has had to do this and how much of a pain I'm getting into. I'm a college student in an apartment so I can only really do projects that don't require a HUGE amount of time or more than general tools, so it's nice to know what to expect.

Also anyone had particular success/misery with specific brands of OEM replacements in the AC system?

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Unread 07-14-2012, 11:45 PM   #2
CJ7-Tim
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Wondering why you need to replace any of the ducting ?

Quote:
Originally Posted by bluejunior View Post
.....it all just blows straight out of the windshield
Start by making sure you have no vacuum leaks, the flapper valve that directs the air runs on engine vacuum. Inspect the vacuum ball behind the front bumper and all the hoses and rubber fittings.

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vac-ball.jpg  
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Unread 07-14-2012, 11:48 PM   #3
Bbasso
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Sounds like you have a vacuum leak...
listen for a hiss on the passenger side fender under the hood.
I tracked mine down to a leak that is behind the front bumper.
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Unread 07-15-2012, 12:00 AM   #4
ltrail
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Sounds like they have you covered here. Try not to tear the whole thing apart to find a leak .
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Unread 07-15-2012, 10:17 AM   #5
Saudade
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Yep! You are welcome to point your favorite search engine at "Cherokee defrost only" and browse through the gazillion threads on this.
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Unread 07-15-2012, 02:28 PM   #6
bluejunior
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Thanks everybody! I'll check for a leak. My last cherokee it really was the unit, so I just assumed it was that again.
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Unread 04-19-2013, 11:55 AM   #7
bluejunior
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UPDATE: I forgot to ever come back and tell everyone the cause of the problem. It actually turned out to be a cracked plug for the Brake booster was the source of my leak. It's at the back driver's side of the engine bay, and apparently a common failure point. Anyone having a minor vacuum-leak related issue might want to check it. Replacing it also fixed a high-pitched whine that varied with engine speed that I had barely noticed until it was gone.
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