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Old 06-24-2012
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Strange AC issue today...

So the woman and I took a short trip to Utah today. Well on the way home, AC was on the second setting, ice cold. Aimed at my face. All of a sudden I notice it isn't blasting in my face anymore, but I can still hear it. It somehow started coming out on the defrost vent on the dash. No setting changed that. Then all of a sudden it diverted half of it back to the vents. Then about 5 min later, all on its own, went back to normal and all the settings working as they should.
Anyone seen this?
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Old 06-24-2012
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Originally Posted by Tys 4x4 FTW View Post
So the woman and I took a short trip to Utah today. Well on the way home, AC was on the second setting, ice cold. Aimed at my face. All of a sudden I notice it isn't blasting in my face anymore, but I can still hear it. It somehow started coming out on the defrost vent on the dash. No setting changed that. Then all of a sudden it diverted half of it back to the vents. Then about 5 min later, all on its own, went back to normal and all the settings working as they should.
Anyone seen this?
I would first start by looking for a vacuum leak. The defrost setting is the default setting for the HVAC system. And whenever there is a vacuum leak it goes to the defroster vents. When it went to the defroster setting did you have a huge load on the engine as that would indicate a small vacuum leak.
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Old 06-24-2012
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I was going uphill in the heat. I know the truck didn't like that lol
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Old 06-24-2012
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I was going uphill in the heat. I know the truck didn't like that lol
LOL. Yeah I'm pretty positive you just have a small vacuum leak lol. The shop truck at work (99 F-150) don't like it when I step on the gas, takes the a/c away from my face lol.
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Old 06-24-2012
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my truck kinda did the same thing, i turned the air on, setting on feet and head, and it was only blowing on my feet. and i switched it around to feet and other settings and it finally started coming out both locations.. so i would think its sorta like what you experienced. not sure
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Old 06-24-2012
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What is a good way to hunt for a vacuum leak?
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