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a/c pressures needed ...
- Thread starter Ertech
- Start date
System pressure chart attached. Good to download and print out.
All cars using R-134a should use the same pressure chart. This is not 100% exact, but should be a good guideline.
If your system reads 5-10 PSI lower or higher than the guidelines in the chart, that is likely OK.
For R-134a, you really NEVER want to see your low-side pressure below ~30-35 PSI, or your high-side pressure above around 275-300 PSI, at most typical ambient temp levels.
For R-12 (older cars, no E500E ever left the factory with it) system pressures are somewhat lower on both the high and low sides.
All cars using R-134a should use the same pressure chart. This is not 100% exact, but should be a good guideline.
If your system reads 5-10 PSI lower or higher than the guidelines in the chart, that is likely OK.
For R-134a, you really NEVER want to see your low-side pressure below ~30-35 PSI, or your high-side pressure above around 275-300 PSI, at most typical ambient temp levels.
For R-12 (older cars, no E500E ever left the factory with it) system pressures are somewhat lower on both the high and low sides.
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