R12 manifold pressure readings - Team Camaro Tech
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post #1 of 3 (permalink) Old Aug 2nd, 18, 11:45 AM Thread Starter
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R12 manifold pressure readings

About to recharge the factory A/C system with R12 on my 68 Camaro. Changed everything except the evap and condenser coils. flushed EVERYTHING several times. Pressure checks are good, holds pressure as well as vacuum. I can't seem to find the manifold pressures to service with. I know it needs 3lbs 12 oz., but what will my pressures be? I know its dependent on ambient temps. I read that all systems are different so I guess I need a specific chart for 68 Camaro system. Just don't see it in the service manual.
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post #2 of 3 (permalink) Old Aug 2nd, 18, 04:22 PM
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Re: R12 manifold pressure readings

Usually, with R12, pressure of 32 PSIG will usually give 35įF from the vent on low speed fan and on MAX or recirculate inside air.
Run engine at 2000-2500 RPM during check. There is an R12 temp vs. pressure chart out there.
The better gauge/manifold set will have a temp chart on low pressure gauge.

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post #3 of 3 (permalink) Old Aug 3rd, 18, 08:32 AM Thread Starter
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Re: R12 manifold pressure readings

Thanks Everett, that's very helpful. So the low pressure is the most important? I actually found the chart in the Service Manual, but all it says for Evap. Pressure is 29.5-30.5 for all Ambient Temps. I also found a detailed Chart for R12 and R134a. Doesn't match the service manual exactly, but seems close. I think I'll use a scale and weigh the Freon I put in, then compare readings to the chart in the service manual.
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