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Very loud noise when AC is on

Discussion in 'Model S: User Interface' started by hemants, Jun 23, 2015.

  1. hemants

    hemants Member

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    On a hot day when I first start the car or if I turn on hvac before entering car there is sometimes a VERY loud fan noise

    I got in and manually turned down the fan speed and it didn't affect the sound, however, turning off the AC made the noise go away.

    Is this some sort of battery cooler or something that needs to be looked at by Tesla?
     
  2. Todd Burch

    Todd Burch Electron Pilot

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    You're hearing the compressor and fan (the compressor noise is typically louder than the fan. For the most part, I think other cars are equally loud with the AC on like that--it's just masked by engine noise.
     
  3. steve841

    steve841 Active Member

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    If you hear a loud buzzing and depending on the age of your car, ask about the acoustic cover for the compressor at next service visit.
     
  4. robert774

    robert774 Member

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    As a new owner I too was a bit surprised initially... what you are most likely hearing is the typical sound of the AC when it is running strong. At its strongest point I find the AC uses 10kWh of electricity at idle!
     
  5. Forty Creek

    Forty Creek Member

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    I had the same experience. A crazy loud sound when a/c was on. There is an acoustic blanket that the service centre will add if you request it. So far this summer, I have been very pleased at its effectiveness.
     
  6. jerry33

    jerry33 S85 - VIN:P05130 - 3/2/13

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    If you have the temperature set low, the A/C compressor is very powerful so it will be loud. Try starting at a higher temperature setting and then lowering the temperature setting as you drive. This has worked for me in previous cars as well as the Model S.
     
  7. Johan

    Johan Took a TSLA bear test. Came back negative.

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    There is a TSB for this, where they install a sound dampening blanket around the AC compressor. Ask to have it done in the Service Center.
     
  8. MartinAustin

    MartinAustin Active Member

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    Yes I think it's really loud in certain circumstances - because it's capable of doing a great job.

    I remember going to visit my in-laws last year, and the car was parked out in the sunshine w/ windows up and no windshield/dash protector. Ambient temperature was in the 90's, I'm sure the temperature inside the car was 115 or more after several hours.

    Turned on the AC from the house to show them the phone app, and within a few minutes, once it had cranked up, the car honestly sounded like a jet aircraft sitting at its gate, ready to taxi! I am sure the neighbors wondered what was going on.

    If the car finds itself in an extreme circumstance, at least it has the power to deal with it.

    Since then though, I have managed the situation so that the car doesn't go so crazy with the noise. Wind the windows down... park it in the shade, use a windshield protector etc. and the AC has a smaller job to do.
     
  9. mknox

    mknox Well-Known Member

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    It does help, especially with the noise outside of the car. I recall before having the fix done that several people stopped to tell me my "engine" sounded weird. It now sounds like a more normal fan noise from the exterior. Inside the car, however, it is still quite loud. I can feel vibration through the steering wheel and when I touch the 17" screen. I will often use Range Mode just to tone it down a bit because Range Mode limits the compressor somewhat.
     
  10. Max*

    Max* Banned

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    I posted a similar thread, I have a lot of vibration in the passenger foot-well, less so on the drivers side steering wheel and foot-well. It's the compressor, because when I turn the fan to 1, it's still there.

    OP -- have you tried to turn off the climate control and then instantly turn it back on? This seems to fix the vibrating issue for me? (maybe I'm just not letting the compressor kick on? but it keeps the car cool enough)

    The SC called me (after seeing my thread) and scheduled an appointment to verify if it's running normally or not.
     
  11. Zarwin

    Zarwin Member

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    I think there are two things being confused here, and what you describe is likely what the OP is talking about. Not the compressor noise, but the cooling fan noise. Mine went into this "supercooling" mode for the first time (that I noticed) on a recent trip while supercharging. Below is a video I took of it (warning loud). While you can hear the compressor faintly, most of the sound is the actual fans and the whistle of the air sucking in the front louvered vents. Standing behind it, you get blasted with warm air blowing out from under the back of the car. Does sound like a jet about to launch down a runway in person. Personally, I think it sounds pretty cool.

    Hot Tesla supercooling while supercharging - YouTube
     
  12. scottm

    scottm Active Member

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    #12 scottm, Oct 10, 2017
    Last edited: Oct 10, 2017
    While I had the frunk bin out doing some maintenance on my car recently... I noticed the placement of some components under there, A/C compressor being one of them.

    It so happens this summer I had notice some very loud (embarrassingly so) A/C compressor noises coming from outside the car, that could also be heard inside the car, along with some vibrations..

    I noticed a couple things that may have contributed to the noise, and made corrections (at zero cost) in effort to solve the noise issue. Maybe this will help you too?

    For the record, my car is 2014 RWD with largest frunk ever made. The A/C compressor is mounted near the front of the car under the bin, and toward the driver side. (The brake vacuum pump is forward and to the passenger side). The compressor is mounted nicely on springy bouncy things that is meant to isolate vibrations. (So is the brake vac pump.) I do not have "the blanket" fix or whatever mod was made for noisy compressors.

    1. An A/C hose to the compressor was bumping the bottom of the frunk bin! You could tell this because everything under the frunk is dusty from road dirt... but one spot on this hose was cleaned off from rubbing... So that would be whacking the bottom of the bin like hitting a drum and amplifying noise. The hose is a combo rubber tubing aluminum piping thing that can be bent down away from the bin slightly by bending the aluminium tubing part. No more contact.

    2. The wiring connector / harness mating pair for the A/C compressor had fallen from its slide-on mount and was lying at the side of the compressor, now freed and being subject to vibration and rattles because it's a hard plastic thing hitting on metal parts that have a lot of movement. I saw how the connector should have been mounted and slid it back on with a positive "click" once firmly in place. I think it may have never been mounted correctly from factory assembly. It seems like it's going to stay on its mount now, so one less thing to buzz.

    I'll need a real hot day next summer when A/C is operating at full thump to tell if these things made a difference to noise levels... but intuitively, pretty sure that hose was a major contributor.

    Maybe check this on your car first if you're off warranty and getting loud A/C compressor sounds. It could save you a lot of money from blindly having the A/C compressor replaced.
     
  13. Ed Hart

    Ed Hart Member

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    ScottM
    I am pretty sure my 2014 S85 with microwave has identical problem. The car has been in three times, and the Tesla folks just shrug...and refuse to do anything. Mine got even worse when the 12 volt battery was replace, like something shifted in the car, and now something is laying against the compressor or its lines. No solution. No sympathy, either. Did your problem diminish in warm weather? Did you take any photos of what you did. I am relatively handy, but have not clue how to remove the microwave. Thanks, if you can. I have been looking into selling the car to get a new X, but no one is going to buy the car like it is.
     
  14. FlyingCookie

    FlyingCookie Member

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    Living in the south and spending a lot of time in Texas, I have not a problem in the world with the fan noise when the AC is running hard... Just sounds like a nice cool car to sit in when it's 105F outside. :)

    If you hear a loud buzzing sound, there is an acoustic blanket that can be put on the compressor to make it quieter. The fans, however, will always be crazy loud at max speed because they're low-profile and very high RPM fans meant to pull a lot of air across the condenser coils when the car is sitting still Supercharging on a hot day.
     
  15. scottm

    scottm Active Member

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    I didn't take pix, but it is pretty simple to get your frunk bin out and check yourself at home. It's not just the microwave, it's the whole frunk that has to come out. There's got to be a youtube video on pull the frunk bin out of a classic Model S by now.

    It hasn't really gotten hot here since I did the (presumable) fix... so no hard working A/C to test/check if the problem is resolved. The problem really was proportional with heat and how hard the A/C was working... on hottest days it was the loudest and embarrassing. On medium hot days, livable.

    The bin would have had to come out with the 12v replacement, but nothing under the bin needs to be touched where the A/C compressor is located.. but maybe they bumped something, or put a foot in the trunk to get better reach to the battery, or rested tools in there... or left a tool in there?
     

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