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heater A/C unit, is cooled to temperatures near the PERFORMANCE TEST PROCEDURE Review Safety Precautions and Warnings in this group before proceeding with this procedure. Air tem- NOTE: When connecting the service equipment (1) Connect a tachometer and manifold gauge set. Attach a thermal couple to the evaporator line. (2) Set controls: MANUAL A/C • A/C ON • Panel Recirculation • Temperature to full cold • High blower ATC (Automatic Temperature Control) System: • Rotate blower knob to high position (full clockwise) • Set temperature to the LO position • Push panel mode button • Push RECIRC (Recirculation) button (A/C and RECIRC symbols should be lit) NOTE: The word MANUAL should appear in the ATC (3) Start engine and hold at 1000 rpm with A/C clutch engaged. (4) Engine should be warmed up with doors and windows closed. (5) Insert a thermometer in the left center A/C outlet and operate the engine for five minutes. The A/C clutch (6) With the A/C clutch engaged, compare the discharge air temperature to the A/C Performance ATC IN-CAR TEMPERATURE SENSOR (1) Perform air flow test to check motor/fan assembly. (a) Turn ignition to the ON position and push the OFF button to stop the ATC system airflow. (b) Place a small piece of newspaper in front of the sensor/motor opening on the ATC control. If the are OK. (3) Check for the two foam seals and their condition, it is absolutely necessary for proper sensor operation. (a) Seal on the inside surface directly behind the nameplate. (b) Seal (strip) located directly to the right of the right center duct opening (instrument panels with A/C PERFORMANCE TEMPERATURE AND PRESSURE AMBIENT TEMPERATURE 21°C (70°F) 26.5°C (80°F) 32.5°C (90°F) 37°C (100°F) 43°C (110°F) MAXIMUM ALLOWABLE AIR 6°C (42°F) 7°C (45°F) 10°C (50°F) 12°C (54°F) 15°C (59°F) COMPRESSOR DISCHARGE 1379–1585 kPa (200–230 psi) 1448–1723 kPa (210–250 psi) 1654–1930 kPa (240–280 psi) 1930–2206 kPa (280–320 psi) 2206–2516 kPa (320–365 psi) COMPRESSOR SUCTION 103–172 kPa (15–25 psi) 139–208 kPa (20–30 psi) 172–241 kPa (25–35 psi) 208–276 kPa (30–40 psi) 241–310 kPa (35–45 psi) 300M HEATING AND AIR CONDITIONING 24 - 7 DIAGNOSIS AND TESTING (Continued) |