Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSLEXUS2004GS 300REPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)GENERAL SERVICINGAIR CONDITIONING SYSTEM (SERVICE)
2004 Lexus GS 300
Air Conditioning System (Service)
2004 Lexus GS 300SECTION Air Conditioning System (Service)
- Air Conditioning System
- Precaution
- On-Vehicle Inspection
- Inspect Refrigerant Volume
- Inspect Refrigerant Pressure With Manifold Gauge Set
- Notes
- Normally Functioning Refrigeration System
- Moisture Present In Refrigeration System
- Insufficient Cooling
- Poor Circulation Of Refrigerant
- Refrigerant Does Not Circulate
- Refrigerant Overcharged Or Insufficient Cooling Of Condenser
- Air Present In Refrigeration System
- Expansion Valve Improperly
- Defective Compression Compressor
- Inspect Idle-Up Speed
- Inspect For Leakage Of Refrigerant
- Evacuating
- Charging
- Location
- Drive Belt
- Manifold Gauge Set
- Refrigerant Line
- Air Conditioning Unit
- Blower Unit
- Compressor And Magnetic Clutch
- Condenser
- Evaporator
- Heater Radiator
- Expansion Valve
- Blower Motor
- Blower Motor Control Relay
- Servomotor
- Sensor
- Pressure Switch
- Relay
- Condenser Fan
- Air Conditioning Control Assembly
- Air Conditioning Amplifier (Electrical Multi Vision)
- Engine Coolant Temperature (ECT) Switch
- Air Refiner Filter
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.