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 Chevrolet Express 1/2 Ton Van V6-4.3L VIN XFACTORY OEM SERVICE PROCEDURE
Service / Diagnostics Caution
CAUTION:
* THE PURITY OF THE SYSTEM REFRIGERANT SHOULD BE CONFIRMED BEFORE ANY OTHER DIAGNOSTICS ARE PERFORMED. THE RI-2002DS REFRIGERANT IDENTIFIER HAS THE ABILITY TO IDENTIFY R-12, R134A, R-22, POTENTIALLY DANGEROUS HYDROCARBONS, AND NON-CONDENSABLE GASES (NCG) SUCH AS AIR. IF THE A/C SYSTEM CONTAINS ANYTHING LESS THAN 98 PERCENT PURE REFRIGERANT, THE REFRIGERANT IS CONSIDERED CONTAMINATED AND THE TEMPERATURE/PRESSURE CHARTS WILL NOT BE VALID. CONTAMINATED REFRIGERANT SHOULD NOT BE RECOVERED AS IT WILL CONTAMINATE THE RECOVERY MACHINE AND REFRIGERANT SUPPLY TANK. AIR IS NOT CONSIDERED A CONTAMINATE AS IT CAN BE PURGED.
* NEVER CHARGE THE A/C SYSTEM THROUGH THE HIGH PRESSURE SIDE OF THE SYSTEM. COMPONENT DAMAGE AND PERSONAL INJURY COULD RESULT.
* DO NOT CONNECT ANY LINE TO THE HIGH-SIDE SERVICE FITTING DURING CHARGING PROCEDURE.
* ALWAYS WEAR GOGGLES AND WRAP A CLEAN CLOTH AROUND FITTINGS, VALVES, AND CONNECTIONS WHEN PERFORMING WORK THAT INVOLVES OPENING THE REFRIGERANT SYSTEM. ALSO, BEWARE OF THE DANGER OF CARBON MONOXIDE FUMES BY RUNNING THE ENGINE IN CLOSED OR IMPROPERLY VENTILATED WORK AREAS.
* R-134A SERVICE EQUIPMENT OR VEHICLE A/C SYSTEMS SHOULD NOT BE PRESSURE TESTED OR LEAK TESTED WITH COMPRESSED AIR. SOME MIXTURES OF AIR/R-134A HAVE BEEN SHOWN TO BE COMBUSTIBLE AT ELEVATED PRESSURES. THESE MIXTURES ARE POTENTIALLY DANGEROUS AND MAY RESULT IN FIRE OR EXPLOSION CAUSING INJURY OR PROPERTY DAMAGE. ADDITIONAL HEALTH AND SAFETY INFORMATION MAY BE OBTAINED FROM REFRIGERANT AND LUBRICANT MANUFACTURERS.
* R-134A SERVICE EQUIPMENT OR VEHICLE A/C SYSTEMS SHOULD NOT BE PRESSURE TESTED OR LEAK TESTED WITH COMPRESSED AIR. SOME MIXTURES OF AIR/R-134A HAVE BEEN SHOWN TO BE COMBUSTIBLE AT ELEVATED PRESSURES. THESE MIXTURES ARE POTENTIALLY DANGEROUS AND MAY RESULT IN FIRE OR EXPLOSION CAUSING INJURY OR PROPERTY DAMAGE. ADDITIONAL HEALTH AND SAFETY INFORMATION MAY BE OBTAINED FROM REFRIGERANT AND LUBRICANT MANUFACTURERS.
* CARE SHOULD BE TAKEN TO PREVENT PERSONAL INJURY WHICH COULD OCCUR DUE TO TOUCHING A HOT ENGINE WHEN TESTING. TESTS SHOULD BE DONE WITH THE ENGINE OFF AND AS COOL AS POSSIBLE. DO NOT OPERATE THE DETECTOR IN A COMBUSTIBLE ATMOSPHERE SINCE ITS SENSOR OPERATES AT A HIGH TEMPERATURE.
* DO NOT CONNECT ANY LINE TO THE HIGH-SIDE SERVICE FITTING DURING CHARGING PROCEDURE.
* NEVER CHARGE THE A/C SYSTEM THROUGH THE HIGH PRESSURE SIDE OF THE SYSTEM. COMPONENT DAMAGE AND PERSONAL INJURY COULD RESULT
* ALWAYS WEAR GOGGLES AND WRAP A CLEAN CLOTH AROUND FITTINGS, VALVES, AND CONNECTIONS WHEN PERFORMING WORK THAT INVOLVES OPENING THE REFRIGERANT SYSTEM.
* ALSO, BEWARE OF THE DANGER OF CARBON MONOXIDE FUMES BY RUNNING THE ENGINE IN CLOSED OR IMPROPERLY VENTILATED GARAGES.
* THE PURITY OF THE SYSTEM REFRIGERANT SHOULD BE CONFIRMED BEFORE ANY OTHER DIAGNOSTICS ARE PERFORMED. THE RI-2002DS REFRIGERANT IDENTIFIER HAS THE ABILITY TO IDENTIFY R-12, R134A, R-22, POTENTIALLY DANGEROUS HYDROCARBONS, AND NON-CONDENSABLE GASES (NCG) SUCH AS AIR. IF THE A/C SYSTEM CONTAINS ANYTHING LESS THAN 98 PERCENT PURE REFRIGERANT, THE REFRIGERANT IS CONSIDERED CONTAMINATED AND THE TEMPERATURE/PRESSURE CHARTS WILL NOT BE VALID. CONTAMINATED REFRIGERANT SHOULD NOT BE RECOVERED AS IT WILL CONTAMINATE THE RECOVERY MACHINE AND REFRIGERANT SUPPLY TANK. AIR IS NOT CONSIDERED A CONTAMINATE AS IT CAN BE PURGED.
* NEVER CHARGE THE A/C SYSTEM THROUGH THE HIGH PRESSURE SIDE OF THE SYSTEM. COMPONENT DAMAGE AND PERSONAL INJURY COULD RESULT.
* DO NOT CONNECT ANY LINE TO THE HIGH-SIDE SERVICE FITTING DURING CHARGING PROCEDURE.
* ALWAYS WEAR GOGGLES AND WRAP A CLEAN CLOTH AROUND FITTINGS, VALVES, AND CONNECTIONS WHEN PERFORMING WORK THAT INVOLVES OPENING THE REFRIGERANT SYSTEM. ALSO, BEWARE OF THE DANGER OF CARBON MONOXIDE FUMES BY RUNNING THE ENGINE IN CLOSED OR IMPROPERLY VENTILATED WORK AREAS.
* R-134A SERVICE EQUIPMENT OR VEHICLE A/C SYSTEMS SHOULD NOT BE PRESSURE TESTED OR LEAK TESTED WITH COMPRESSED AIR. SOME MIXTURES OF AIR/R-134A HAVE BEEN SHOWN TO BE COMBUSTIBLE AT ELEVATED PRESSURES. THESE MIXTURES ARE POTENTIALLY DANGEROUS AND MAY RESULT IN FIRE OR EXPLOSION CAUSING INJURY OR PROPERTY DAMAGE. ADDITIONAL HEALTH AND SAFETY INFORMATION MAY BE OBTAINED FROM REFRIGERANT AND LUBRICANT MANUFACTURERS.
* R-134A SERVICE EQUIPMENT OR VEHICLE A/C SYSTEMS SHOULD NOT BE PRESSURE TESTED OR LEAK TESTED WITH COMPRESSED AIR. SOME MIXTURES OF AIR/R-134A HAVE BEEN SHOWN TO BE COMBUSTIBLE AT ELEVATED PRESSURES. THESE MIXTURES ARE POTENTIALLY DANGEROUS AND MAY RESULT IN FIRE OR EXPLOSION CAUSING INJURY OR PROPERTY DAMAGE. ADDITIONAL HEALTH AND SAFETY INFORMATION MAY BE OBTAINED FROM REFRIGERANT AND LUBRICANT MANUFACTURERS.
* CARE SHOULD BE TAKEN TO PREVENT PERSONAL INJURY WHICH COULD OCCUR DUE TO TOUCHING A HOT ENGINE WHEN TESTING. TESTS SHOULD BE DONE WITH THE ENGINE OFF AND AS COOL AS POSSIBLE. DO NOT OPERATE THE DETECTOR IN A COMBUSTIBLE ATMOSPHERE SINCE ITS SENSOR OPERATES AT A HIGH TEMPERATURE.
* DO NOT CONNECT ANY LINE TO THE HIGH-SIDE SERVICE FITTING DURING CHARGING PROCEDURE.
* NEVER CHARGE THE A/C SYSTEM THROUGH THE HIGH PRESSURE SIDE OF THE SYSTEM. COMPONENT DAMAGE AND PERSONAL INJURY COULD RESULT
* ALWAYS WEAR GOGGLES AND WRAP A CLEAN CLOTH AROUND FITTINGS, VALVES, AND CONNECTIONS WHEN PERFORMING WORK THAT INVOLVES OPENING THE REFRIGERANT SYSTEM.
* ALSO, BEWARE OF THE DANGER OF CARBON MONOXIDE FUMES BY RUNNING THE ENGINE IN CLOSED OR IMPROPERLY VENTILATED GARAGES.
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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