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 Hummer H2 V8-6.0LFACTORY OEM SERVICE PROCEDURE
Compressor Oil Balancing
COMPRESSOR OIL BALANCING
DRAINING
IMPORTANT: Drain and measure as much of the refrigerant oil as possible front the removed compressor.
1. Drain the oil from both the suction and discharge ports of the removed compressor into a clean, graduated container. Rotate the compressor shaft to assist in draining the compressor.
2. Measure and record the amount of oil drained from the removed compressor. This measurement will be used during installation of the replacement compressor.
3. Properly discard the used refrigerant oil.
BALANCING
IMPORTANT: The refrigerant oil in the A/C system must be balanced during compressor replacement.
1. The replacement compressor is shipped with the total system capacity of refrigerant oil.
2. Before installing the compressor the refrigerant oil will have to be partially drained:
2.1. Refer to the amount of refrigerant oil recorded during the compressor removal.
2.2. Subtract the amount recorded from the total system capacity. Refer to Refrigerant System Capacities. The difference between the total system capacity and the recorded amount is the calculated amount to be drained from the replacement compressor.
3. Drain the calculated amount of refrigerant oil from the replacement compressor.
Factory Service Tools
Use the Manual With the Right Hardware
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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.