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Noise on New Compressor

krauseas on Mon August 30, 2010 10:51 PM User is offline

Year: 1995
Make: Honda
Model: Accord
Engine Size: 2.7 V6
Refrigerant Type: 134a
Ambient Temp: 87
Pressure Low: 35
Pressure High: 150
Country of Origin: United States

Compressor on my daughter's 95 Accord locked up. Found later that the fuse on the condenser fan was blown, so it may have been running pretty high pressure and she did not realize it. I replaced pretty much the whole system: Compressor (Sanden TRS type), condenser, receiver/drier, and expansion valve. Flushed all the remaining lines and the evaporator and cleaned it and put the system back together with all new o-rings, etc. Pretty much a new system. I added recommended 4.5 oz of PAG-46 oil, pulled vacuum, and charged with new 134a. System is supposed to hold 19.6-21.4 oz 134a. After I got the first ~15 oz of refrigerant in the system and it was starting to cool, I noticed an occasional clicking/clacking noise coming from the compressor. Definitely the compressor as it is perfectly quiet when I turn the system off and the clutch disengages.

I have read several different forums indicating that this noise may indicate poor lubrication, however, I was pretty careful to add the recommended amount of oil. I was also careful about the amount of charge and believe I should be within the recommended range.

Not pleased yet with the cooling either: I was only getting around 74F air at idle with 87F ambient. Was measuring 35 psi low and 150 psi high at this time. When test driving up at speed, was getting 59-60F air at same ambient.

Anyone have advice on this? Did I reintroduce too much air into the system when I was filling it? Also, what about the compressor noise.

Chick on Tue August 31, 2010 12:27 PM User is offlineView users profile

system amounts your system calls for 5.5 ounces of Pag 46, and 23 ounces of R134a, go by the underhood sticker as far as the refrigerant goes though..And the system must have the full charge of oil and refrigerant.... 15 ounces is not enough and won't properly move the oil around..

Email: Chick


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HECAT on Tue August 31, 2010 1:09 PM User is offline

click/clack may just be cycling due to low charge. Get the full amount in there.


HECAT: You support the Forum when you consider for your a/c parts.


iceman2555 on Tue August 31, 2010 10:54 PM User is offlineView users profile

It is quite possible that the sound is the result of clutch cycling, however, this is another of those famous scroll compressors. It may be that your system is seriously contaminated. First, by all means, insure that the system is fully charged. Then measure the inlet temp of the condenser. If desired test the outlet temp also...but normally a primary test of discharge temps/pressures is sufficient. Post this temp. I can image that the line will be extremely hot. This will indicate a restricted condenser. This could also be the reason for lack of cooling performance.
Unfortunately, this is another of those 'replace everything' vehicles. Without the proper flush equipment and chemicals, it is impossible to adequately clean this system.
Good luck!!!

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

krauseas on Wed September 01, 2010 12:05 AM User is offline

Thanks for the input. I'll have to borrow tools to get the temperatures, I don't own any. I will try to do that, but I will say that the outlet temperature is hot to the touch, but not extremely hot. I would say the outside of the hose is ~140-160F. I can put my hand on it and it is only mildly uncomfortable. Inlet temperature is just a little below ambient as it sweats just a little bit.

Pressures were measured at 35 / 150 at idle and 15 / 170 at 1500 RPM. Ambient temperature was 87 F and very humid.

This is definitely not contamination in the system (unless the new compressor has already failed) because as I noted in the original post, I replaced the compressor, condenser, dryer, and TXV, and I flushed and blew out the evaporator and all the remaining hoses. It was definitely clean because it was essentially new with the exception of the hoses lines and evaporator, which I am confident were well cleaned.

The only thing that I am concerned about regarding system contamination is that I may have reintroduced more air in the system when charging than desired due to mistake I may have made while changing cans. Also, I installed the dryer earlier than desired (because I was shipped the wrong compressor). I plugged the open line ends however while I was waiting on the compressor for a few days. I am tempted to evacuate the system, change the dryer, vacuum and start over with a charge.

I know what the clutch sounds like and I really don't think it is a clutch cycling. Thoughts?

iceman2555 on Wed September 01, 2010 8:23 AM User is offlineView users profile

Air could be a problem. But check the other issues first and insure that the system is totally charged. Since there is a concern about the air, why not have the system recovered, evac'd and recharged. This would remove two possible areas of concern or doubt.
Try performing your test...MAX AIR, HIGH BLOWER, DOORS OPEN,ENGINE@IDLE.
Compare temps..component and then compare the difference between ambient temps and vent temps. Post results.

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

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