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 MANUALSCHEVROLET1994C 2500 SUBURBAN 2WD V8-350 5.7LREPAIR AND DIAGNOSISSPECIFICATIONSCAPACITY SPECIFICATIONSHEATING AND AIR CONDITIONINGSYSTEM SPECIFICATIONSREFRIGERANT OIL DISTRIBUTION
1994 Chevrolet C 2500 Suburban 2WD V8-350 5.7L
Refrigerant Oil Distribution
1994 Chevrolet C 2500 Suburban 2WD V8-350 5.7LSECTION Refrigerant Oil Distribution
REFRIGERANT OIL DISTRIBUTION
The Harrison HT-6 compressor system used on all models requires polyalkaline glycol (PAG) refrigerant oil in the quantities listed below:
- Without Aux. A/C - 240 ml (8 fl oz)
- With Aux. A/C - 330 ml (11 fl oz)
New oil quantities must be added to the system during component replacement and conditions stated as follows:
- With no signs of excessive oil leakage, add:
A. All Compressors (drain and measure the oil)
- If less than 30 ml (1 fl oz) is drained-add 60 ml (2 fl oz) to the new compressor.
- If more than 30 ml (1 fl oz) is drained-add same amount that was drained to the new compressor.
B. Accumulator-Add 105 ml (3.5 fl oz) of new oil to the replacement accumulator to compensate for oil retained by original accumulator desiccant and bag assemblies. The accumulator should only be replaced if leaking due to a perforation, damaged O-ring seal seat, or damaged threads.
C. Evaporator-Add 90 ml (3 fl oz) of new refrigerant oil.
D. Condenser-Add 30 ml (1 fl oz) of new refrigerant oil.
REFRIGERANT OIL LOSS DUE TO A LARGE LEAK
If the refrigerant charge is abruptly lost due to a large refrigerant leak, approximately 90 ml (3 fl oz) of refrigerant oil will be carried out of the system suspended in the refrigerant. Any failure that caused a abrupt refrigerant discharge will experience this oil loss. Failures that allow the refrigerant to seep or bleed off over time do not experience this oil loss.
Upon replacement of a component that caused a large refrigerant leak, add 90 ml (3 fl oz) of new polyalkaline glycol (PAG) refrigerant oil plus the desired amount of oil for the particular component.
The Harrison HT-6 compressor system used on all models requires polyalkaline glycol (PAG) refrigerant oil in the quantities listed below:
- Without Aux. A/C - 240 ml (8 fl oz)
- With Aux. A/C - 330 ml (11 fl oz)
New oil quantities must be added to the system during component replacement and conditions stated as follows:
- With no signs of excessive oil leakage, add:
A. All Compressors (drain and measure the oil)
- If less than 30 ml (1 fl oz) is drained-add 60 ml (2 fl oz) to the new compressor.
- If more than 30 ml (1 fl oz) is drained-add same amount that was drained to the new compressor.
B. Accumulator-Add 105 ml (3.5 fl oz) of new oil to the replacement accumulator to compensate for oil retained by original accumulator desiccant and bag assemblies. The accumulator should only be replaced if leaking due to a perforation, damaged O-ring seal seat, or damaged threads.
C. Evaporator-Add 90 ml (3 fl oz) of new refrigerant oil.
D. Condenser-Add 30 ml (1 fl oz) of new refrigerant oil.
REFRIGERANT OIL LOSS DUE TO A LARGE LEAK
If the refrigerant charge is abruptly lost due to a large refrigerant leak, approximately 90 ml (3 fl oz) of refrigerant oil will be carried out of the system suspended in the refrigerant. Any failure that caused a abrupt refrigerant discharge will experience this oil loss. Failures that allow the refrigerant to seep or bleed off over time do not experience this oil loss.
Upon replacement of a component that caused a large refrigerant leak, add 90 ml (3 fl oz) of new polyalkaline glycol (PAG) refrigerant oil plus the desired amount of oil for the particular component.
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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.