2000 Lexus GS300, GS400 Air Conditioning Repair Manual (P/N RM718U)

• Official 100-page Lexus publication (RM718U) delivering factory-authorized technical data for the 2000 model year cooling systems.
• Covers maintenance, component disassembly, and diagnostics for both GS300 and GS400 sedan variants.
• Features 13 detailed component diagrams for the AC unit, compressor, condenser, and blower motor, alongside dedicated torque tables for system fasteners.
• Provides the baseline pressure and idle-up speed specifications necessary for correct refrigerant charging procedures.

Component and System Documentation

The guide details the removal, tear-down, and installation processes for primary thermal management hardware. Sections break down the refrigerant line routing, evaporator housing, and blower motor control relay replacements for both Electrical Multi Vision and standard console setups. Technicians will find precise exploded views illustrating the exact orientation of the expansion valve, compressor mounts, and service valve caps throughout the refrigeration cycle.

Technical Data and Inspection Values

Inside, the text outlines exact refrigerant capacities and pressure benchmarks crucial for diagnostic testing. For instance, low-side pressure runs at 0.15–0.25 MPa, while high-side benchmarks hit 1.37–1.57 MPa under normal operation. It also documents the compressor lock sensor resistance at 570–1,050 ohms at 20°C. Torque values for suction and discharge hoses are set at 10 Nm across most connections. Working with automotive HVAC systems involves handling highly pressurized refrigerant; always use approved recovery equipment and follow standard workshop safety practices.