I had my AC serviced a few days ago. On the drive home I noticed a fairly loud whine, sounds like it could be belt related. Gets louder when I accelerate and goes away completely when AC is turned off. Is this cause for a return trip to the shop to complain/have fixed, or is this a normal post-AC service sound that will subside after the AC is run for a bit? ('91 X with 16K mi, no other known mechanical issues).
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noise/whine after AC service, concern?
- Thread starter BMillar
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Definitely doesn't sound right - possibly compressor itself - maybe re-charged with too much freon; or could be the clutch bearing, although there would be no real reason why that should just start after the service.
I would take it back & see what shop has to say.
I would take it back & see what shop has to say.
It sounds the same whether clutch is engaged or disengaged, so probably not clutch related?
A/C compressor clutch - not drivetrain clutch.BMillar said:
My ac had a loud whine after I charged it last year. Turned out I didn't have any oil in the compressor, (A result of a huge evap leak). Be careful because I've been told here on the forum if your compressor seizes it will be a real PITA to flush out the contaminents. I ended up replacing my Evap and the compressor.
OK, I will take car back to shop (AC off) and report back here what the issue was for future reference. Thanks guys.
Well, not much to report. I took it back to the shop, of course the "whine" would not happen when the "doctor was in." I've put another 5-6K miles on the car since this time, sometimes I hear it, sometimes not. AC seems to work fine. The whine has never been as loud as it was immediately after the service. So, its remained a mystery to me as well. Anyone else?
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I had my AC system checked and recharged yesterday. The system was low on refrigerant with .6 lbs remaining. It held vacuum, so they recharged it and added dye for leak detection. After the recharge it blows ice cold and the moaning went away. Will monitor it to see how it behaves.
Hopefully this was all it needed.
Hopefully this was all it needed.
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The moan returned with a vengeance today. :frown: I will give it a test run and see if it occurs at 2000-3000 rpm. At this point I am thinking it is the compressor/clutch - that is the only AC system component that is affected by rpms, am I right or wrong? The moaning gets louder when accelerating. I think (not sure, not really my area of expertise) I also audibly detect the faint sound of a rotating compressor shaft bearing that may be failing.
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Hello, my a/c system was making the same noise as yours an it turned out to be the clutch. The dealer replaced the clutch and after 3 month the noise was back. The dealer replaced the clutch again and 6 month later the same problem appeared. Now the clutch is holding for 9 month. All i want to say is that not everybody is a specialist and airco's can be difficult. I think that my clutch was built in wrong the first two times.
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Hello, thank you for the information. I was just looking online at new compressors/clutches, which are inexpensive at less than $USD200 (plus shipping costs). The oem compressor is a Denso 10PA15C.
Compressor
I e-mailed them and they said this compressor also came with a clutch, plus a drier for an extra $25.
Compressor/Clutch
Compressor/Clutch
When these links expire, just search for "NSX compressor" on Ebay.
Compressor
I e-mailed them and they said this compressor also came with a clutch, plus a drier for an extra $25.
Compressor/Clutch
Compressor/Clutch
When these links expire, just search for "NSX compressor" on Ebay.
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I purchased a new compressor/clutch (plus drier) in the top link above from Ebay seller "coolerairllc". Of note, I requested that they make sure to send a compressor with an NSX pulley and not an Integra pulley, as many of these compressors are sold with an Integra pulley, according to my research on the topic. I will see how this turns out; if I receive the wrong pulley I think it is possible to use the pulley from the old compressor, but I am uncertain if the pulley can be detached from the clutch, and I don't want to use the old clutch just to get the correct pulley. I don't particularly want to use a shorter belt either. Hopefully I will receive the correct pulley.
Total for everything including shipping was $212. Now waiting for it to arrive...
Total for everything including shipping was $212. Now waiting for it to arrive...
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Make sure you check the pulley. Every place I know of gets this wrong, mainly because Integra pulleys are very popular, NSX's are not
.
Regards,
LarryB
.Regards,
LarryB
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Saw a little honey in an Integra at the gas station today; I really liked the way she was wearing her seat belt. :smile: Too bad I was in a borrowed Mazda pickup. :frown: I guess it doesn't really matter; I am probably too old for her anyway. :smile:
A blind guess, but that sounds like fan noise to me. If it only happens when very cold and only briefly, I wouldn't worry about it. :smile:
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Sensei, if I still get the wrong pulley, can I swap out the pulleys while keeping the new clutch, or is the pulley an integral part of the clutch?
Note to moderator: Any chance you could move this thread to the "Do-It-Yourself" forum? Thanks!
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My theory* is that when it is very cold, the metal in the fan contracts just enough to cause some contact between the reciprocating parts. When it is warmer and the metal is expanded slightly, I think this provides enough clearance for everything to turn smoothly.
Or could you be referring to the aspirator fan, which is located behind the grill-like opening ahead forward of the parking brake?
*I don't know that for sure though; that is just my theory.
If this is the only symptom, I don't think you have anything to worry about.:smile:
Or could you be referring to the aspirator fan, which is located behind the grill-like opening ahead forward of the parking brake?
*I don't know that for sure though; that is just my theory.
If this is the only symptom, I don't think you have anything to worry about.:smile:
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If it is enough of a problem to warrant attention, I would remove and examine the Blower Assembly, as referenced on Pages 951 and 950 of the 1991 NSX Service Manual. My understanding is that they can become filled with "filings" from the deteriorating brushes and start binding. Supposedly cleaning them out works well. You might find other problems (looseness, binding, etc) in the process. It would be a process of discovery.
I get a whine mix with a rattle every now and then, but it's odd,
it only happens when the weather is cold cold
The noise comes right in front of me, somewhere
around the clutch & brake fluid reservoir area.
ChongLee this sounds like your ABS is cycling, I would not be concerned, do a flush on it. It exists exactly where your describing.
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