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Old 04-08-2014, 05:11 PM
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Weird hiss when air is on

So I got my windows tinted today and can't open them for 3 days. Today was the first time I drove the jeep with the windows up, no radio, and the air on. Had the temp set at 72 degrees. I noticed a sound that would come and go. It kinda sounded like something filling up with air or releasing it. It was pretty consistent. I would hear it for like 2-3 seconds and then nothing for about a minute and then it would do it again. Any idea what this might be? Anyone else experience this? Thanks!
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Old 04-08-2014, 05:42 PM
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Re: Weird hiss when air is on

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Originally Posted by PhillyAnt View Post
So I got my windows tinted today and can't open them for 3 days. Today was the first time I drove the jeep with the windows up, no radio, and the air on. Had the temp set at 72 degrees. I noticed a sound that would come and go. It kinda sounded like something filling up with air or releasing it. It was pretty consistent. I would hear it for like 2-3 seconds and then nothing for about a minute and then it would do it again. Any idea what this might be? Anyone else experience this? Thanks!
Does it sound anything like the various air doors opening and closing, like what you might hear if you change the air flow?

I've only noticed slight hiss when the fan is running lowest speed.
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Old 04-08-2014, 07:20 PM
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Re: Weird hiss when air is on

I started hearing this in my12 with the AC on. Turns out I had a vent closed and it was just restricted air.
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Old 04-08-2014, 08:05 PM
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Re: Weird hiss when air is on

I've heard the same periodic hissing sound and have no idea what it is ... doesn't happen very frequently, but it's subtle when it does ... weird, indeed.

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Old 04-08-2014, 08:33 PM
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I had a hissing sound in my 12 GC that I thought was a partially closed vent or damper. Turned that the coolant was low. Dealer refilled and tested and 20,000 miles later no problem. I would have that checked.
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Old 04-09-2014, 01:38 AM
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Re: Weird hiss when air is on

Air conditioned seats? Not sure if my Jeep makes these noises (haven't paid attention) but in other cars the fans that cool the seats are pretty noisy.

Tony
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Old 04-09-2014, 10:52 AM
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Re: Weird hiss when air is on

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Originally Posted by PhillyAnt View Post
... I noticed a sound that would come and go. It kinda sounded like something filling up with air or releasing it. It was pretty consistent. I would hear it for like 2-3 seconds and then nothing for about a minute and then it would do it again. Any idea what this might be? Anyone else experience this? Thanks!

I had the exact same thing catch my attention yesterday too. I was gonna post it but couldn't think of a good way to describe it.

AC was on, cause it hit 90 already!, sounded as if an air pump was filling something up (ramping up) for a few seconds, then it would stop for a few. Was very consistent.
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Old 04-09-2014, 12:00 PM
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Re: Weird hiss when air is on

If you have QL, there are components located below the driver seat that could make an audible hiss noise when adjusting the suspension. I hear it every now and again, but also always have my radio on.
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Old 04-09-2014, 07:26 PM
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Re: Weird hiss when air is on

I just heard a constant hissing noise the other day. Turns out it was my passenger vented seat unoccupied.
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Old 07-01-2014, 12:41 PM
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Re: Weird hiss when air is on

See AC sounds like water faucet turnin on and off and 2014 Grand Cherokee Air Conditioning Problem
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