Sight Glass Inspection Of Refrigerant Volume - Lexus 1993 ES300 General Procedures

Sight Glass Inspection of Refrigerant Volume

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Inspect A/C Sight Glass as follows:
1. Start the engine and maintain 1500 RPM.
2. Set the A/C controls to AUTO – MAX COOL.
3. Open all vehicle doors.
4. At the Under Hood Diagnostic Connector jump OP1
to E1 to maintain a stable fan speed.
5. Run the engine at 1500 RPM with the doors open
for at least 2 minutes to stabilize the A/C system.
NOTE: Every A/C sight glass shows air bubbles both
immediately after starting and after switching from one
condition to another. So, it is necessary to wait 2 minutes
after any A/C operating condition has changed.