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 MANUALSCHEVROLET1999EXPRESS 1/2 TON VAN V6-4.3L VIN WREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESSCAN TOOL DATA, NORMAL VALUES AND DEFINITIONSSCAN TOOL DATA DEFINITIONS - POWERTRAIN SYSTEMSA/C SEC. HIGH PRES. SWITCH
1999 Chevrolet Express 1/2 Ton Van V6-4.3L VIN W
A/C Sec. High Pres. Switch
1999 Chevrolet Express 1/2 Ton Van V6-4.3L VIN WSECTION A/C Sec. High Pres. Switch
(Open/Closed)
The Secondary High Press. Switch closes when the A/C systems high pressure limit is approached. The VCM monitors the state of this switch for compressor and auto recirculation operation. The switch closes at a high pressure value which is calibrated for specific platforms. The VCM continuously monitors the secondary high pressure switch when A/C has been selected by the operator.
The Secondary High Press. Switch closes when the A/C systems high pressure limit is approached. The VCM monitors the state of this switch for compressor and auto recirculation operation. The switch closes at a high pressure value which is calibrated for specific platforms. The VCM continuously monitors the secondary high pressure switch when A/C has been selected by the operator.
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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.