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 MANUALSCHEVROLET2002EXPRESS 1/2 TON VAN V8-5.7L VIN RREPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICSA/C SYSTEM PERFORMANCE TEST
2002 Chevrolet Express 1/2 Ton Van V8-5.7L VIN R
A/C System Performance Test
2002 Chevrolet Express 1/2 Ton Van V8-5.7L VIN RSECTION A/C System Performance Test
This test measures the operating efficiency of the A/C system under the following conditions:
^ The current ambient air temperature
^ The current relative humidity
^ The high side pressure of the A/C system
^ The low side pressure of the A/C system
^ The temperature of the air being discharged into the passenger compartment
Test Description
The numbers below refer to the step numbers on the diagnostic table.
1. This step determines if the A/C system has at least the minimum refrigerant charge required to operate the system without damage.
2. This step measures the performance of the A/C system.
3. This step is to allow for vehicle variations as well as high ambient temperatures.
^ The current ambient air temperature
^ The current relative humidity
^ The high side pressure of the A/C system
^ The low side pressure of the A/C system
^ The temperature of the air being discharged into the passenger compartment
Test Description
Steps 1-2:
Steps 3-8:
The numbers below refer to the step numbers on the diagnostic table.
1. This step determines if the A/C system has at least the minimum refrigerant charge required to operate the system without damage.
2. This step measures the performance of the A/C system.
3. This step is to allow for vehicle variations as well as high ambient temperatures.
RENDER: 1.0x
NO RELATED
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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.