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R-134a A/C Pressure Chart by Ambient Temperature - Low & High Side PSI/kPa

Reference chart of R-134a low- and high-side pressures versus ambient temperature.

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This document is an R-134a temperature/pressure reference chart (bilingual English/Spanish, titled 'Tabla de Temperaturas y Lecturas') from a 'DIY A/C Recharge' source, with header links labeled 'HOW TO' and 'SERVICE PORT FINDER'. It lists expected low-pressure and high-pressure gauge readings for automotive air conditioning systems using R-134a refrigerant across ambient temperatures from 65°F (18°C) to 110°F (43°C) in 5-degree increments. Each row shows the ambient temperature, the low-pressure (low-side service port) reading range in both psi and kPa, and the high-pressure (high-side service port) reading range in psi and kPa. For example, at 75°F (24°C) the low side should read 35-40 psi (241-310 kPa) and the high side 150-170 psi (1034-1172 kPa); at 95°F (35°C) the low side should read 50-55 psi (345-379 kPa) and the high side 275-300 psi (1896-2068 kPa). A footnote clarifies that ambient temperature means the outside atmospheric temperature. The chart is a generic diagnostic aid for checking A/C system charge and performance with a manifold gauge set; it is not vehicle-specific, though it was filed with a 1995 Ford Bronco.

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Frequently asked questions

What should R-134a low-side pressure be at 90°F ambient temperature?
Per the chart, at 90°F (32°C) the low-pressure gauge should read 45-55 psi (310-379 kPa).
What is the normal R-134a high-side pressure at 75°F?
At 75°F (24°C) the high-pressure gauge should read 150-170 psi (1034-1172 kPa).
What does 'ambient temperature' mean on this chart?
The chart states that ambient temp is the outside atmospheric temperature.
What temperature range does this R-134a pressure chart cover?
It covers ambient temperatures from 65°F (18°C) up to 110°F (43°C) in 5°F increments.
What should the high-side pressure be at 100°F ambient?
At 100°F (38°C) the high-pressure gauge should read 315-325 psi (2172-2241 kPa).

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