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R-12 Recharge Questions

79vetter on Fri July 15, 2011 9:12 PM User is offline

Year: 1979
Make: Chevy
Model: Corvette
Engine Size: 350
Refrigerant Type: R-12
Ambient Temp: 95

I have replaced everything except the condenser ( I flushed that) . I have never had the A/C work since I have owned the car (5 years) here in Dallas. I want to do the job right the first time. The system is almost all put back together - not charged yet..Here are my questions:

1) I want to add .25oz of UV Dye. Can I just pour all of this in any opening (except for the compressor)?
2) Does the dye go in before the Oil?
3) When adding in the mineral oil (6oz.) can I just measure and pour some in the Evap and then the Compressor (which port?). After pouring some into the Compressor, do I just attach the hose and then turn the compressor clutch clockwise for a few turns?
4) I read a post whereby someone advises to charge as much as possible on the high side port (with the engine off) - before moving to the low side port with the engine on..Is this correct?

thanks Rob

TRB on Fri July 15, 2011 10:36 PM User is offlineView users profile

80 percent of the oil in the compressor 20 percent in the accumulator. Mix dye with oil.

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79vetter on Fri July 15, 2011 10:47 PM User is offline

thanks - how about the other questions?

mk378 on Sat July 16, 2011 12:11 AM User is offline

If you have the A6 compressor, put the oil into the oil port in the side, replace the plug and install it on the car.

Leak-test the complete system under pressure with some other gas before evacuating and charging with R-12.

bromodragonfly on Sat July 16, 2011 1:19 AM User is offlineView users profile

Dry nitrogen would be best. Do not use compressed air.

Since it's "almost back together," I assume it's been taken apart for a bit of time. I would pull a deep vacuum for several hours after pressure testing, if I wanted to do the job right the first time

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There is no knowledge that is not power

79vetter on Sat July 16, 2011 10:05 AM User is offline

This site is great in that it addresses individual problems...I feel like the Procedures section could be a little more thorough. It would probably reduce a number of questions that are posted and re-answered here
Most of my questions have probably been answered in a thread somewhere. I have looked for them.

JJM on Sat July 16, 2011 12:11 PM User is offline

As for the last question, really doesn't make much of a difference when the engine is off, though probably better to vacuum through both the low and high side ports (leave both wheels open), and do the initial charge through both the high and low side ports (again both wheels open) with engine off.

Also, if you're using the short radial R4 compressor, that gets 6 oz of oil, but if you're using the long A6, that needs 10 oz of oil.

Joe

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