A/C compressor won't turn
01-29-09, 08:11 AM
#1
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A/C compressor won't turn
My 86 was wsitting for 6 years and as a result there are some bugs to work out. One owhich is the A/C compressor will not turn. With engine running when I turn the A/C on the engine quits. I heard that if you remove the compressor, take the clutch off you can use penetrating spray lubricant that will free things up so she will come back to life. Anybody have experience in this area? Compressors are cheap but I thought if it were a minor problem I could do an easy repair and have coolness this summer. Always looking ahead these days. Thanks in advance, Mag
01-29-09, 08:57 AM
#2
No, if the compressor is locked, it is likely corroded internally. Make it turn and it will vomit it's guts into the rest of your system. This is what is known as 'Bad'.
These compressors are easy to pickup used on the boards-all the street racer-wannabe's
strip every bit of civilization out of the car just so they can later complain about the speeding tickets. You will be better off buying a used one in the parts for sale section.
My advice-and I am a lover of all things A/C-
Flush the compressor, -to flush, add a couple oz of Ester, rotate the compressor by had 10-15 rotations, dump the ester. Repeat this 2 more times.
Replace the receiver-dryer. New is the only way.
Replace the O-rings with new Green o-rings (top of the compressor and dryer inlet/outlet at least).
Add 4 oz of Ester 100 to the compressor
Add 3 oz of Ester 100 to the dryer.
For the love of all that you hold dear, do not use any PAG oils in your RX7 system!-If an OEM specs PAG in a different car, use it. Never put PAG into any system that has ever run R12.
Pull a deep vacuum held for 30 min. (no, a venturi type vacuum pump is *not* good enough). Borrow or rent a real vacuum pump. Autozone and oriellys both rent vacuum pumps for *free*.
Charge with 24 oz of Freeze 12-exactly 2-12oz cans. Nothing else cools as well as Freeze-12 except the original R12.
Personally, I have an A/C license and buy and use only R12. (If you use R12, the amount correct amount is 29oz and you should use 6 oz total of mineral oil, not ester.)
Do not use 134a! Our systems do not work well converted to 134a. The condenser is too small and you can never get the pressures right. Yes, I know that Freeze12 is mostly 134a, but it is a completely different animal on the pressure-temperature curve.
Do not use any of the hydrocarbon refrigerants. Why? They don't work with a s**t. Only use them if you are in a region where you don't really need a/C. They work fine up there. Oh, they also burn, since they are propane and isobutane.
These compressors are easy to pickup used on the boards-all the street racer-wannabe's
strip every bit of civilization out of the car just so they can later complain about the speeding tickets. You will be better off buying a used one in the parts for sale section.My advice-and I am a lover of all things A/C-
Flush the compressor, -to flush, add a couple oz of Ester, rotate the compressor by had 10-15 rotations, dump the ester. Repeat this 2 more times.
Replace the receiver-dryer. New is the only way.
Replace the O-rings with new Green o-rings (top of the compressor and dryer inlet/outlet at least).
Add 4 oz of Ester 100 to the compressor
Add 3 oz of Ester 100 to the dryer.
For the love of all that you hold dear, do not use any PAG oils in your RX7 system!-If an OEM specs PAG in a different car, use it. Never put PAG into any system that has ever run R12.
Pull a deep vacuum held for 30 min. (no, a venturi type vacuum pump is *not* good enough). Borrow or rent a real vacuum pump. Autozone and oriellys both rent vacuum pumps for *free*.
Charge with 24 oz of Freeze 12-exactly 2-12oz cans. Nothing else cools as well as Freeze-12 except the original R12.
Personally, I have an A/C license and buy and use only R12. (If you use R12, the amount correct amount is 29oz and you should use 6 oz total of mineral oil, not ester.)
Do not use 134a! Our systems do not work well converted to 134a. The condenser is too small and you can never get the pressures right. Yes, I know that Freeze12 is mostly 134a, but it is a completely different animal on the pressure-temperature curve.
Do not use any of the hydrocarbon refrigerants. Why? They don't work with a s**t. Only use them if you are in a region where you don't really need a/C. They work fine up there. Oh, they also burn, since they are propane and isobutane.
01-29-09, 01:00 PM
#3
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Jack, I just read the whole message you gave me. It has all the answers necessary to freeze myself out this summer. I like being totally informed. Thats good, Mag
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