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.
2004 Mazda 3 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.
3. Remove the splash shield.
NOTE: The A/C drive belt is not reusable.
4. Remove the A/C drive belt. Service and Repair
5. Detach the two wiring harness clamps.


6. Remove in the order indicated in the table. Do not allow remaining compressor oil in the A/C compressor to spill.
CAUTION: If moisture or foreign material enters the refrigeration cycle, cooling ability will be lowered and abnormal noise or other malfunction could occur. Always plug open fittings immediately after removing any refrigeration cycle parts.
7. Install in the reverse order of removal.
8. Perform the refrigerant system performance test.
A/C Compressor Installation Note
CAUTION: Due to the high moisture-absorption characteristics of the compressor oil, it may absorb moisture if left over a long period of time thereby negatively affecting A/C operation. Drain the compressor oil and refill within 10 min. of each other.
1. Rotate new A/C compressor shaft six to eight revolutions while collecting refrigerant oil in a clean measuring device. Use this refrigerant oil to refill new compressor. Do not allow refrigerant oil to become contaminated.
2. Rotate old A/C compressor shaft six to eight revolutions while collecting refrigerant oil in a separate, clean measuring device.
3. Compare those oil amounts. The amount of the oil drained from the new A/C compressor should be greater than the old one.

4. Pour the same amount oil of drained from the old A/C compressor back into the new A/C compressor.
A/C compressor oil type
- ATMOS GU10
A/C compressor oil sealed volume (approx. quantity)
- 155 ml {155 cc, 5.24 fl oz}
1. Disconnect the negative battery cable.
2. Discharge the refrigerant.
3. Remove the splash shield.
NOTE: The A/C drive belt is not reusable.
4. Remove the A/C drive belt. Service and Repair
5. Detach the two wiring harness clamps.
6. Remove in the order indicated in the table. Do not allow remaining compressor oil in the A/C compressor to spill.
CAUTION: If moisture or foreign material enters the refrigeration cycle, cooling ability will be lowered and abnormal noise or other malfunction could occur. Always plug open fittings immediately after removing any refrigeration cycle parts.
7. Install in the reverse order of removal.
8. Perform the refrigerant system performance test.
A/C Compressor Installation Note
CAUTION: Due to the high moisture-absorption characteristics of the compressor oil, it may absorb moisture if left over a long period of time thereby negatively affecting A/C operation. Drain the compressor oil and refill within 10 min. of each other.
1. Rotate new A/C compressor shaft six to eight revolutions while collecting refrigerant oil in a clean measuring device. Use this refrigerant oil to refill new compressor. Do not allow refrigerant oil to become contaminated.
2. Rotate old A/C compressor shaft six to eight revolutions while collecting refrigerant oil in a separate, clean measuring device.
3. Compare those oil amounts. The amount of the oil drained from the new A/C compressor should be greater than the old one.
4. Pour the same amount oil of drained from the old A/C compressor back into the new A/C compressor.
A/C compressor oil type
- ATMOS GU10
A/C compressor oil sealed volume (approx. quantity)
- 155 ml {155 cc, 5.24 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:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
