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Ac only blows through defroster


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OK look, I need some help. Im decent at fixing things on most cars but I for sure don't know ...

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Old 06-10-2016, 01:54 AM   #1 (permalink)
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Default Ac only blows through defroster

OK look, I need some help. Im decent at fixing things on most cars but I for sure don't know everything and usually go through YouTube or some of my mechanic buddies which is why I'm here.

2012 jeep liberty sport...

My ac blows nice and cold but out of nowhere yesterday it began only blowing through the defrost vents. I checked the relays and disconnected then reconnected the control panel for the ac/heat. I'm guessing it my be a vacuum leak but I'd where to start with finding it or where the lines might be. Can anybody help out please? Break it down barney style or even send pics or short video to my email if that helps to explain easier...

Last edited by USMCpaden; 06-10-2016 at 01:55 AM. Reason: Left out model and year
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Old 06-10-2016, 02:45 PM   #2 (permalink)
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Does ANY air at all blow out of the other vents?

If you can't switch any of your climate controls to move from defrost, to floor, or dash vent, that tells me that the actuator is not receiving its vacuum signal. Can you get under the dash and verify that the actuator is not stuck/seized in any way?
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Old 07-06-2016, 03:48 AM   #3 (permalink)
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There are a few entryways and vacuum actuators behind the dash. For air to leave the dash vents you require vacuum at the "mode entryway" actuator and vacuum at the "defrost entryway" actuator. This keeps the defrost entryway shut and, in the meantime, guides air to the dash vents rather than the floor (radiator) vent.
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Old 06-06-2018, 06:52 AM   #4 (permalink)
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Did you ever find a solution to this problem? I’m experiencing the same thing...I know this is a old thread but I can’t find any “newish” info on this.

*ac blowing only through defeost***

Last edited by Coltb46; 06-06-2018 at 06:53 AM. Reason: Forgot information
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