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 MANUALSCHEVROLET1999ASTRO VAN 2WD V6-4.3L VIN WREPAIR AND DIAGNOSISMAINTENANCEFLUIDSREFRIGERANTSERVICE PRECAUTIONSMAINTAINING CHEMICAL STABILITY
1999 Chevrolet Astro Van 2WD V6-4.3L VIN W
Maintaining Chemical Stability
1999 Chevrolet Astro Van 2WD V6-4.3L VIN WSECTION Maintaining Chemical Stability
Maintaining Chemical Stability
The life and efficient operation of the air conditioning system depends upon the chemical stability of the refrigerant system. The stability of Refrigerant-134a and Polyalkaline Glycol (PAG) refrigerant oil changes when the following materials contaminate the refrigeration system:
^ Dirt
^ Air
^ Moisture
The foreign materials will cause the following to occur:
^ The affect of the pressure-temperature relationship
^ Reduce the efficiency
^ Cause internal corrosion
^ Abnormal wear of moving parts
Follow the following general practices in order to ensure chemical stability in the system:
^ Wipe away any dirt or oil at or near the connection in order to eliminate the possibility of dirt entering the system when disconnecting a hose.
All air contains moisture. Air that enters any part of the refrigeration system will carry moisture into the refrigeration system. The exposed surfaces will quickly collect the moisture. Perform the following steps in order to prevent dirt or moisture from entering the hose connection:
- Cap both sides of the connection
- Plug both sides of the connection
- Tape both sides of the connection
^ Keep the tools clear and dry, including the manifold gauge set. Keep the replacement parts clean and dry.
^ Ensure that the container/transfer tube through which the oil flows is exceptionally clean and dry when adding PAG refrigerant oil.
^ Ensure the refrigerant oil is free of moisture.
^ Have everything needed ready prior to opening the air conditioning system. Do not leave the air conditioning system open any longer than necessary.
^ Properly evacuate the air conditioning system before recharging the air conditioning system anytime the air conditioning system is open.
The life and efficient operation of the air conditioning system depends upon the chemical stability of the refrigerant system. The stability of Refrigerant-134a and Polyalkaline Glycol (PAG) refrigerant oil changes when the following materials contaminate the refrigeration system:
^ Dirt
^ Air
^ Moisture
The foreign materials will cause the following to occur:
^ The affect of the pressure-temperature relationship
^ Reduce the efficiency
^ Cause internal corrosion
^ Abnormal wear of moving parts
Follow the following general practices in order to ensure chemical stability in the system:
^ Wipe away any dirt or oil at or near the connection in order to eliminate the possibility of dirt entering the system when disconnecting a hose.
All air contains moisture. Air that enters any part of the refrigeration system will carry moisture into the refrigeration system. The exposed surfaces will quickly collect the moisture. Perform the following steps in order to prevent dirt or moisture from entering the hose connection:
- Cap both sides of the connection
- Plug both sides of the connection
- Tape both sides of the connection
^ Keep the tools clear and dry, including the manifold gauge set. Keep the replacement parts clean and dry.
^ Ensure that the container/transfer tube through which the oil flows is exceptionally clean and dry when adding PAG refrigerant oil.
^ Ensure the refrigerant oil is free of moisture.
^ Have everything needed ready prior to opening the air conditioning system. Do not leave the air conditioning system open any longer than necessary.
^ Properly evacuate the air conditioning system before recharging the air conditioning system anytime the air conditioning system is open.
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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.