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Corvette compresoor failure, how much oil

machv1 on Thu August 23, 2007 8:30 PM User is offline

Year: 1990
Make: Cheverolet
Model: Corevtte
Refrigerant Type: R12
Country of Origin: Canada

1990 Corvette AC compressor failed. I removed it and followed the previous instructions as per the forum "measure how much you removed from the compressor" problem is there wasn't any. Could this be one of the reasons why it failed irregardless, I need to put a rebuilt compressor into the car, it is a R12 compressor, how much oil should I add? And what type of oil? Likewise with the dryer should I be adding oil, if so how much?
Does it matter which port of the compressor you pour the oil into, like wise with the dryer?
Anyones help would be greatly appreciated!!

Thks

Machv1

Chick on Thu August 23, 2007 8:51 PM User is offlineView users profile

Since it's an R12 system it has mineral oil. either 500 or 525 viscosity are the most common around. You will need to flush the system to remove all the old oil and the parts of the compressor that are in your condenser.. Are you going to be using R12 (I see you are in Canada) or a blend? If using R12, try to stay with the mineral oil, I believe 8 ounces, should be a tag with the amount under the hood somewhere, but we can look it up if you need it..If using R134a or a blend, go with a quality ester oil. But a flush is needed....Hope this helps.

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

iceman2555 on Thu August 23, 2007 9:58 PM User is offlineView users profile

8oz is the correct amount of lubricant.....3 in the compressor.....suction side....'larger of the two' and the remainder into the inlet (evap) side of the accumulator.
Esters will work great with this Denso supplied compressor. Just be sure to recharge it correctly. Condenser cooling is and has always been a problem with Vettes. Insure that the system is totally charged....evap inlet and outlet the same temp or within 5 degrees of each other. If a high side pressure problem exist...make sure the condenser cooling fan is fully operational.
Just finished assisting a local body shop owner with his retro of his 90...worked great. Although he did wish to rewire the condenser fan to full time operation during compressor engagement. Not cold enough to 'hang meat' but it works very well.
Good luck!!!!

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Thomas Jefferson

machv1 on Sat August 25, 2007 1:37 PM User is offline

I really appreciate the reply, thank you! FYI, I purchased a rebuilt compressor, dryer and orfice tube from the US. The parts I ordered were suppose to be an exact match as what was in the car for that year. The rebuilt compressor has no name visible but is stamped CB-E7 on the end. The R12 was reclaimed from the old compressor and system, none was lost.
I had planned to add the oil to the compressor (2oz) and dryer (if applicable ?) and drive it down to the ac shop and have them put the 12 back in. But one of the replys indicated if I need to flush the system........... not sure if I can install the components and drive the car with no oil or refrigerant in the system and have it flushed. Can it be flushed without a compressor installed, since it is rebuilt and is already clean. Is flushing something that I would be able to do, not sure what the process is?

Your thoughts would be greatly appreciated

Machv1

dannyual767 on Sat August 25, 2007 2:48 PM User is offlineView users profile

Quote
Originally posted by: machv1
.......Can it be flushed without a compressor installed, since it is rebuilt and is already clean. Is flushing something that I would be able to do, not sure what the process is?



Your thoughts would be greatly appreciated



Machv1

Yes, flush without the compressor in place. Read this thread from the FAQ:

Flushing procedure

HECAT on Mon August 27, 2007 9:30 AM User is offline

When you recovered the R-12 from the system, it leaves behind the remainder of the refrigerant oils and potential debris from the compressor failure.

Certain compressor failures (reasons for removal) such as clutch failure and seal leaks at times can be repaired by only replacing the compressor, o-tube, filter. This is done at risk, and requires the "educated guess" to be employed; to add back the amount of oil required to properly lubricate the compressor, without overfilling the system with oil. The only way to be 100% sure of the quality and amount of oil is to first remove all the old.

If the compressor suffered internal failure and considerable debris is found in the o-tube, the system is contaminated. Without flushing out the waste oils and debris from the components BEFORE reassembling the system. This contaminated oil and debris will be circulating through your new (not for long) compressor.

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FLUSHING TECHNICAL PAPER vs2.pdf 

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