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Old 05-18-2012, 03:47 PM   #1
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TJ Sahara Intermittent A/c??? Agh!!

Hi All!
Summer is coming and the S. FL hour long commute is starting to demand the A/C...
Why is it that when my A/C is on it will "all of a sudden" Decide to do something to block the air from coming thru the vents I've selected (front)!!???

Sometimes it blasts through the defroster vent & sometimes just the side vents!??

As if it has a mind of it's own!!! The blower is still blowing cold air but it's as if the vent system has decided not to play ball!

HELP!!! This confusion has been killing me!!!!

Thank You's ahead of time!

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Old 05-18-2012, 04:03 PM   #2
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Are you loosing vacuum? IIRC the blend air doors are operated by small vacuum hose from the reservoir.

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Old 05-18-2012, 07:13 PM   #3
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Yep this sounds like a vacuum leak. I want to say the default is out the defrost if there is no vacuum. A small leak would make it do the same thing.
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Old 05-18-2012, 07:54 PM   #4
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Check the vacuum reservoir under the battery; the vacuum line going to it, and make sure the vacuum line going through the firewall near the evap. lines is intact. Open the glove box and check the vacuum lines to the HVAC. Start the engine and listen for a vacuum leak...
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Old 05-18-2012, 08:19 PM   #5
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Yup, mine did the same thing. The small black hose near the battery broke and it was no longer forcing the air thru the vents. By default it will work on defrost.
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Old 05-18-2012, 08:48 PM   #6
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Yep, probably a vacuum leak. Like they said check the box under the battery. Usually when a line breaks completely your air will default out the vents, if it changes at random while driving then its a crack in a line getting ready to break.

Heres the diagram to follow, number 8 is the box under the battery, easy way to access it rather than moving the battery is to lay under the passenger side behind the front wheel and look up along the firewall in a gap on the frame.

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Old 05-20-2012, 05:57 PM   #7
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Thanks for the replies & the awesome diagram!
It was the hose that attaches to #8 the vaccum reservior box thingy that was dried, old & split... $1.50 worth of rubber vaccum hose should do it... We'll see in the FL heat tomorrow am!

Thanks Again!

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