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  #73  
Old 08-07-2011, 10:00 AM
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Re: V6 High Pitched Sound

First, I would like to thank all the people who have posted solutions to this problem. We recently bought a 2011 Jeep Grand Cherokee Laredo and love it except for this high pitched noise when the AC is on and it is at 1000 - 1200 RPMs - exactly how you have described here. We found your postings and brought them to the dealership and I'm happy to report that the problem is fixed!!!

Here's the story...we brought the car in two weeks ago after the sound got very annoying. We asked the technician to drive with us to ensure that they heard the sound which they confirmed. We also gave him some of the postings here highlighting what seemed to have been the fix.

They kept the car for a week and replaced the Expansion Valve and the A/C Suction and Liquid Line (details below). At the end of the week they notified us that the car still made the sound, so they took it in for another week. During this past week they contacted Chrysler and were running some tests. After a couple days they called me saying they still aren't sure how to fix it, so I returned to this site to see if there was any additional information regarding a fix. That's when I saw krpatrick's post. I forwarded it to the service adviser and followed up with a phone call. He said they had just heard from Chrysler and were going to test something else and then possibly replace it depending on the results of the test. I asked him to please read my email and if they could try the fix krpatrick noted first. The technician read my email, ordered the parts, installed them, and tested confirming the problem was fixed (details below)!!!! I'm not sure if it was only the stuff they did the second week or a combination of both, but all I know is that it is now fixed!!! SO I'd like to thank all of you for posting this as it would not be fixed without this site!! Thank you!

Here's the fix that was on our 'invoice':
1st Week:
  • 24352001 Valve, expansion (H-valve) - Replace Front Unit (B)
    • 82300101AB *Refrigerant-R134A
    • 68079483AA Valve-A/C Expansion
  • 24454101 O-ring or gasket - Replace Discharge line to compressor/manifold (B)
    • 55038201AD Line - A/C Suction and Liquid
Not fixed - car still made the sound

2nd Week:
  • 1979 A/C Lines replaced the A/C suction and liquid and 1 suction line and Recharge system and verified repair
    • 55038201AE Line - A/C suction and liquid
    • 55038016AE Line - A/C suction
    • 82300101AB - *Refrigerant - R134A
FIXED!!!
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  #74  
Old 08-10-2011, 12:19 PM
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Re: V6 High Pitched Sound

I noticed that a TSB was just posted yesterday (8/9) with a similar fix to RMVJeep's post. Looks like we have a solution for the masses now! I for one will be scheduling with my dealer in the near future.
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  #75  
Old 08-10-2011, 04:16 PM
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Re: V6 High Pitched Sound

This is the TSB:

http://www.wk2jeeps.com/tsb/tsb_wk2_2400711.pdf
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  #76  
Old 08-10-2011, 05:16 PM
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Re: V6 High Pitched Sound

Sweet. I just knew they'd be bringing out a TSB for this. Glad to see it finally dropped.

I'll have to make an appt. with the dealer to have it done.
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  #77  
Old 08-12-2011, 06:51 PM
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Re: V6 High Pitched Sound

Good stuff, gentlemen. So pleased by all your efforts.
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  #78  
Old 08-12-2011, 09:30 PM
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Re: V6 High Pitched Sound

Just got mine back tonight (parts took a couple days). So far so good -- Thanks all!!!
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  #79  
Old 08-22-2011, 12:26 PM
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Re: V6 High Pitched Sound

Mine went in this morning to be diagnosed. The noise was determined to be the subject of the TSB, but unfortunately, the refrigerant hose isn't in a local warehouse, so it will be a few more days until the actual fix can be applied.

This is my last gripe about my WK2... once this is fixed I'll be a happy camper. Everything else has been dealt with.
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  #80  
Old 08-25-2011, 09:39 AM
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Re: V6 High Pitched Sound

Good news.Went to dealer.They looked at AC noise and ordered the TSB parts.Should be in next week.All little issues will have been solved.Cheers
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  #81  
Old 09-08-2011, 11:55 AM
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Re: V6 High Pitched Sound

How loud/noticeable is this sound? Do you only hear it from inside the cabin or can you hear it under the hood?

My hearing isn't the greatest and I don't know if I have this. I do notice that the fan can be a bit noisy but I don't hear a specific whine or anything...
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  #82  
Old 09-09-2011, 10:22 AM
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Re: V6 High Pitched Sound

Quote:
Originally Posted by hammer1234 View Post
How loud/noticeable is this sound? Do you only hear it from inside the cabin or can you hear it under the hood?

My hearing isn't the greatest and I don't know if I have this. I do notice that the fan can be a bit noisy but I don't hear a specific whine or anything...
The noise (at least for me), is very subtle and almost like the high pitched frequency noise you might hear when a TV is left on or one of the cell phone ringers that only kids are supposed to hear. It could very well be there and you might not hear or notice it. Once you do notice it though it will drive you nuts!
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  #83  
Old 09-09-2011, 10:29 AM
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Re: V6 High Pitched Sound

Quote:
Originally Posted by Parks311 View Post
The noise (at least for me), is very subtle and almost like the high pitched frequency noise you might hear when a TV is left on or one of the cell phone ringers that only kids are supposed to hear. It could very well be there and you might not hear or notice it. Once you do notice it though it will drive you nuts!
OK, thanks...will most likely have to ask my kid to listen for it...
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Old 09-12-2011, 01:00 PM
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Re: V6 High Pitched Sound

Just a follow up: I had the fix applied this morning. As near as I can tell* the whistle/squeal is gone.

*It's insanely difficult, if not impossible, to prove a negative. All I can say is that the sound has not happened again despite purposefully trying to cause it (and I was indeed able to do so).

Looks like the last item on my gripe list has been fixed and now I can relax and enjoy the vehicle.
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