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 MANUALSCHEVROLET1998EXPRESS 1 TON VAN V8-5.7L VIN RREPAIR AND DIAGNOSISRELAYS AND MODULESRELAYS AND MODULES - HVACCONTROL MODULE HVACDESCRIPTION AND OPERATIONA/C SYSTEM
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN R
A/C System
1998 Chevrolet Express 1 Ton Van V8-5.7L VIN RSECTION A/C System
The blower switch provides a choice of various blower speeds. The blower switch receives power through a fuse in the fuse block when the ignition switch is "ON." In the low-speed position, the circuit continues through the heater wiring harness to three resistors in the resistor assembly near the blower motor.
When the blower switch is in a medium-speed position, the circuit continues through the heater wiring harness to the resistor assembly, but it bypasses one or two of the resistors.
When the blower switch is in the "HI" position, the circuit continues through the heater wiring harness to the resistor assembly, but it bypasses all three resistors to provide full power to the blower motor.
From the resistor assembly, the circuit goes to the blower motor terminal to operate the blower motor.
When the blower switch is in a medium-speed position, the circuit continues through the heater wiring harness to the resistor assembly, but it bypasses one or two of the resistors.
When the blower switch is in the "HI" position, the circuit continues through the heater wiring harness to the resistor assembly, but it bypasses all three resistors to provide full power to the blower motor.
From the resistor assembly, the circuit goes to the blower motor terminal to operate the blower motor.
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.