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  #13  
Old 07-18-2012, 07:38 PM
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Re: What in the heck kind of noise was this? loud moan after starting car.

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Old 07-18-2012, 07:45 PM
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Re: What in the heck kind of noise was this? loud moan after starting car.

Hey, Thanks Angler. I'll keep you updated on the fix. heres hoping its something simple and not the compressor clutch.
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Old 08-12-2012, 03:41 AM
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Re: What in the heck kind of noise was this? loud moan after starting car.

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Originally Posted by GlennR View Post
Hey, Thanks Angler. I'll keep you updated on the fix. heres hoping its something simple and not the compressor clutch.
Guys, heres a thread DownUnder that details events so far. Waiting for a TXV and evaporator to come from the US, but really reluctant to have my dash ripped out. Told it's a total strip back to the firewall by Jeep Service!!

http://jeepgarage.org/showthread.php?t=45378
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Old 08-13-2012, 09:52 AM
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Re: What in the heck kind of noise was this? loud moan after starting car.

I work for a CJD dealer in SA and have had a vehicle with the same issue. Its sounds like a ghost thats moaning and a vibration can be felt right through the vehicle body.

Replaced the aircon compressor and is now sorted.
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Old 08-13-2012, 12:52 PM
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Re: What in the heck kind of noise was this? loud moan after starting car.

Mine does the same except some time it is a higher pitch.
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Old 08-13-2012, 01:35 PM
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Re: What in the heck kind of noise was this? loud moan after starting car.

ROFL ! I just heard the noise on the ZIP file. I thought you might have been calling Sheep or sumfin!

But in all seriousness I had this issue this weekend one time as well. I thought it was my Wheel as it started right after a started to pull away.

Was hot and humid too.
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Old 08-14-2012, 01:31 PM
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Re: What in the heck kind of noise was this? loud moan after starting car.

It's an anomaly with the AC system that I've experienced a few times on vehicles over the years and yes I did have it happen (twice) on my WK2 the past two years. An HVAC engineer explained it to me many years ago but I can only recall this: it is the system equalizing a large pressure change.

Think of it like letting air out of a balloon connected to a larger volume container: if you let air out carefully you get no noise but the whoosh of airflow; if you try forcing air out too fast you get the funny "plgghhhhh" fart noise or in the case of a vehicle AC system, a momentary groan. The AC system making that groan is doing that with the same effect as the balloon example when you have the system working hard, shut it off, then turn on again later.

It should be a very rare occurrence and if not, could mean a problem with the compressor/lines/valves. I would recommend the dealer checking your refrigerant but leaving it alone if the noise only occurs infrequently. You open a bucket of worms tearing apart the HVAC system chasing what could just be an occasional annoyance with no guarantee or curing it.
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Old 09-18-2012, 06:02 PM
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Re: What in the heck kind of noise was this? loud moan after starting car.

Add me to the list.....put the GC in park and got the vibration....the air was on at the time.
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Old 09-19-2012, 12:50 AM
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Re: What in the heck kind of noise was this? loud moan after starting car.

Here is the sound in all its glory I posted to YouTube!! Still as bad as ever now Springs arrived and the temps are averaging mid 20's C (high 70'sF). Hopefully get a fix before Summer!

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Old 07-25-2013, 09:04 AM
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Re: What in the heck kind of noise was this? loud moan after starting car.

My 2005 JGC 5.7L was also doing this. I bought her only about 3 months ago, so I'm still finding the little things here and there that need fixing.

It's been really hot here in Texas and I've been running the AC full blast all the time. About 2 weeks ago, I noticed that when I came to a stop light or was just slowly driving through parking lots, the loud moaning would come from the front. At first I thought I was low on power steering fluid. I checked and the fluid was at the "minimum" line, so I thought I'd top her off and hope that solved the problem. I bought the OEM Mopar stuff, topped her off, but then later that day, the moaning was back. I stopped the jeep, put her in park, tried to center the steering wheel, but the moaning kept going loudly. Then I decided to shut off the AC so I could hear it better. A few seconds later after shutting down the AC, the moaning stopped!

This issue continued for the next couple weeks. During cold start, there didn't seem to be an issue. It only would happen after the jeep was hot and I had been driving a while with the AC blasting.

Then I seemed to notice the AC wasn't very cold, especially on blistering hot afternoons. I got one of the cheap AutoZone refill kits and put the pressure gauge on first to see if it was full. It said it was, but I know these cheap systems have crappy gauges, so I didn't really trust it.

I took it in to a shop on Monday and they said there was a slight leak at a connection near the high valve, so they said they fixed the connection and drained and re-filled the AC system. Now I have cool AC again and the moaning hasn't come back. It's been 4 days now so hopefully this solved it!

Good luck to everyone with the issue! I hope you get it figured out.
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