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.
2003 Mazda 6 L4-2.3LFACTORY OEM SERVICE PROCEDURE
Compressor HVAC: Service and Repair
A/C COMPRESSOR REMOVAL/INSTALLATION
1. Disconnect the negative battery cable.
2. Discharge the refrigerant from the system. (See REFRIGERANT CHARGING.)
3. Remove the right side splash shield and mudguard.
4. Remove the WU-TWC. (AJ-VE only) (See EXHAUST SYSTEM REMOVAL/INSTALLATION [AJ].)
5. Loosen the drive belt and remove it.
CAUTION: If moisture or foreign material enters the refrigeration cycle, cooling ability will be lowered and abnormal noise will occur. Always immediately plug open fittings after removing any refrigeration cycle parts to keep moisture or foreign material out of the cycle.
6. Remove in the order indicated in the table. Do not allow compressor oil to spill.
7. Install in the reverse order of removal.
8. Adjust the drive belt.
9. Perform the refrigerant system performance test. (See REFRIGERANT SYSTEM PERFORMANCE TEST.)
A/C Compressor Installation Note
1. Remove the following amount of compressor oil from the new A/C compressor when replacing the A/C compressor.
Compressor oil to be removed (approximate quantity): 150 ml {150 cc, 5.07 fl oz} - [compressor oil from old A/C compressor + 15 ml {15 cc, 0.5 fl oz}]
1. Disconnect the negative battery cable.
2. Discharge the refrigerant from the system. (See REFRIGERANT CHARGING.)
3. Remove the right side splash shield and mudguard.
4. Remove the WU-TWC. (AJ-VE only) (See EXHAUST SYSTEM REMOVAL/INSTALLATION [AJ].)
5. Loosen the drive belt and remove it.
CAUTION: If moisture or foreign material enters the refrigeration cycle, cooling ability will be lowered and abnormal noise will occur. Always immediately plug open fittings after removing any refrigeration cycle parts to keep moisture or foreign material out of the cycle.
6. Remove in the order indicated in the table. Do not allow compressor oil to spill.
7. Install in the reverse order of removal.
8. Adjust the drive belt.
9. Perform the refrigerant system performance test. (See REFRIGERANT SYSTEM PERFORMANCE TEST.)
A/C Compressor Installation Note
1. Remove the following amount of compressor oil from the new A/C compressor when replacing the A/C compressor.
Compressor oil to be removed (approximate quantity): 150 ml {150 cc, 5.07 fl oz} - [compressor oil from old A/C compressor + 15 ml {15 cc, 0.5 fl oz}]
Factory Service Tools
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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.