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Procedure 1 — Ambient Temperature At or Below 38°C (100°F) NOTE: The system performance can be evaluated and diagnosed by analysis of the compressor suction and discharge pressures. The following procedure is used to determine if the system is operating at normal pressures. NOTE: The procedure varies depending on the ambient (shop) temperature. If the ambient temperature is 38°C (100°F) or lower, follow procedure 1. If the ambient temperature is over 38°C (100°F), follow procedure 2. NOTE: If the A/C compressor cycles at any time during this test, refer to the diagnostic table. 1. Drive the vehicle or run the engine until it reaches normal operating temperature. 2. Connect a manifold gauge set or refrigerant service center with high-pressure and low-pressure gauges to the refrigerant system.
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