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Basic questions for renewing my system

amphicar770 on Tue July 06, 2010 4:38 PM User is offline

Year: 1968
Make: Olds
Model: Cutlass Vista Cruiser
Country of Origin: United States

Hi All,

I am getting ready to renew the A/C system on my 1968 Olds Vista Cruiser. As far as I know, the current system is all original. It actually works although I can tell the compressor is aging and putting big strain on engine.

In any event, I have secured all new hoses, expansion valve, receiver dryer, a rebuilt compressor, and a rebuilt POA valve. I have gauges, electric vacuum pump, and a 30 lb canister of R12. I also picked up a couple bottles of synthetic universal compressor oil.

So, before I get started on the work, a few noob type questions.

1) I recall reading that when using 30 lb canister that the canister should be upside down (valve pointing toward ground). Is this correct?

2) How do I add the requisite quantity of oil? Do I simply pour it into the compressor and / or hoses prior to vacuuming down the system?

3) What is best way to measure the quantity of refrigerant dispensed from 30lb container? (Or should I just use the cans, I have some of those too).

4) I was planning to get a couple of cans of flush and flush out evaporator and condensor after hoses removed. Will this suffice (note I am not cleaning up after a failed compressor).

Any other things to be aware of when I tackle this job?

Thanks,

Mike

HECAT on Tue July 06, 2010 9:26 PM User is offline

1. Tank has no dip tube - upside down for liquid fill into vacuum w/ engine off - upright for gas fill w/engine running.

2. Start with known empty system (flushed). Put most if not all into the compressor (rotate it before start up).

3. With a scale - cans can get you crudely close.

4. Tube condenser maybe - chambered evaporator unlikely.

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

FLUSHING TECHNICAL PAPER vs2.pdf 

amphicar770 on Wed July 07, 2010 8:39 PM User is offline

amphicar770 on Wed July 07, 2010 8:43 PM User is offline

Thanks for he reply. I ordered myself a scale as I will be doing some of my other vehicles soon enough.

Just clarification on the 30 lb container upside down for liquid charge once system is vacuumed down. That is done on high side with engine off, correct? I assume it will draw a certain amount and then I switch to feeding it gas on the low side with engine running? Do I rotate compressor by hand when feeding the liquid charge?

Thanks again.

mk378 on Wed July 07, 2010 10:12 PM User is offline

You should do a pressure test with some other gas first to be sure there are no leaks before charging any R-12. Vent and evacuate the test gas then charge R-12 into vacuum.

Yes charge liquid to the high side first, valves in the compressor should keep any from backing up into the compression cylinders.

Edited: Wed July 07, 2010 at 10:14 PM by mk378

HECAT on Thu July 08, 2010 7:35 AM User is offline

Rotate compressor to push out the oil before charging.

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

FLUSHING TECHNICAL PAPER vs2.pdf 

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