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 H2FACTORY OEM SERVICE PROCEDURE

Service Specifications

SERVICE SPECIFICATIONS

Application

Specification

PAG Oil

U.S. Vehicles

P/N 12378526

Canadian Vehicles

P/N 88900060

Accumulator Replacement

⁽¹⁾

Compressor Replacement

⁽²⁾⁽³⁾ 2 ozs.

Condenser Replacement

⁽²⁾⁽³⁾ 1 ozs.

Evaporator Replacement

⁽²⁾⁽³⁾ 3 ozs.

Total System PAG Oil Capacity

8 ozs.

Refrigerant Charge (R-134a)

1.6 lbs

⁽¹⁾	Add 2 ozs. of PAG oil, plus the equal amount of oil drained from the accumulator.

⁽²⁾	The Denso replacement compressor is precharged with 8.0 ozs. of PAG oil.

⁽³⁾	If more than the specified amount of PAG oil was drained from a component, add the equal amount drained.

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.

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