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Help, V5 Noise

pf24 on Mon August 04, 2008 11:59 PM User is offline

Year: 1997
Make: Pont
Model: Bonneville
Engine Size: 3.8L
Refrigerant Type: 134A
Country of Origin: United States

My new V5 compressor has been in service a month is still working good but has started to make some noise. I can hear it when in the driver seat. It is a vibrating sort of sound that varies with RPM. When I am under the hood you can not hear any bad noises comming from the compressor.

For this project I had flushed the system, replaced the accumilator and orfice tube and I am sure I put the correct oil charge in of 8oz PAG150.

Any thoughts on what to do? Is my compressor about to die?


iceman2555 on Tue August 05, 2008 12:33 AM User is offlineView users profile

Unfortunately the V series compressors are one of the more difficult compressors for a DIYer to service. Lubricant....where it is introduced into the compressor....and the greatest difficulty is in the recharge mode...the system must be properly recharged....adding refrigerant by the can may actually contribute to some of the noise issues being discussed.
Also, it is doubtful that the noise issue is going to go away....sorry to say....but sounds as if the compressor, if indeed it is the compressor that is producing the noise, is headed toward replacement.
One major aspect of this compressor is the need for a total refrigerant recharge to maintain lubricant flow to the 'pivot bearing'. Also adding oil to the suction port as is done on most all other GM compressor may not the proper method with this unit.
Lubricant should be added to the case thru an access bolt in the case. For correct operation, the system should be fully charged prior to clutch engagement. Not to mention that the system should be clean of all debris from the previous failure. Restrictions, even those that may not produce excessive pressures will rapidly lead to compressor damage and possible failure.
Darn...give up on this damn photo resize program....will try tomorrow.....

The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

Edited: Tue August 05, 2008 at 12:35 AM by iceman2555

GM Tech on Tue August 05, 2008 5:35 AM User is offline

When a vehicle system that uses a V-5 compressor loses about half its charge it makes a very distinct noticeable "pumping" noise inside the vehicle only- underhood all sounds fine-- so is your charge level up to factory spec or have you lost some since you charged it? You may have a leak- only way to know for sure is to pull refrigerant out and weigh it..

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

befuddled on Tue August 05, 2008 9:58 AM User is offline

Hey Iceman, what photo resize program are you trying to use?

iceman2555 on Tue August 05, 2008 12:16 PM User is offlineView users profile

Came with the comp...Microsoft Digital something.....however, have another program,Adobe Photoshop....that needs to be loaded....just seems like the time slips away....the microsoft program does the resize thing...all looks good till a attempted and all of a sudden the darn thing is the size of a barn....... of course, could possibly be the operator instead of the operating system.....

The strongest reason for the people to retain the right to keep and bear arms is, as a last resort, to protect themselves against tyranny in government.
Thomas Jefferson

pf24 on Wed August 06, 2008 12:45 AM User is offline

Thanks GM Tech and Iceman,

I did not think to add referegerent because the A/C was still working.

I had referegerent added an ounce at a time untill the noise stopped. It took about 14 oz and it went quiet. I did it by adding an ounce at a time and then getting back in the car and listining. This noise was only present 2 days so I am very hopefull the compressor is not junk.

Dye was put in the system when when it was put together so my next step is to get a black light and inspect for the leak. I looked everything over with natural light and I dont see any oil stains.

After I identify the leak I will take it in to get recovered so I can fix it.

Thanks again

pf24 on Wed August 06, 2008 12:49 AM User is offline

After fixing the leak i can get the system properly recharged with referegerent; but how do I no how much oil is left in the system after the leak?


befuddled on Wed August 06, 2008 2:44 AM User is offline

The full blown adobe photoshop is very expensive, and a nightmare of complexity. But it will do anything. You most likely have a copy of Elements. Great little program, usually under a hundred bucks retail, and often bundled. Install it. Open it and put your picture in it. Click file. On the drop down menu there will be 'save for web'. Click that and your picture will appear in two frames. Over on the right will be the length and width in pixels. Change one pixel count, and the other automatically changes. A good longest dimension is 600. There will be a preview in the right frame. If you are happy with it, click apply and up top, click ok. The words may change with different versions. They are up to 5.0 or something now. A window will open up giving you a place to save it. It takes much less time to do than it takes to read this.

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