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 DIAGNOSISHEATING AND AIR CONDITIONINGCONTROL ASSEMBLYDESCRIPTION AND OPERATIONHVAC SYSTEM - MANUALMODE CONTROLSBLOWER MOTOR SPEED CONTROL
1999 Chevrolet Express 1/2 Ton Van V6-4.3L VIN W
Blower Motor Speed Control
1999 Chevrolet Express 1/2 Ton Van V6-4.3L VIN WSECTION Blower Motor Speed Control
The blower switch provides a choice of various blower speeds. A fuse in the fuse block provides power to the blower switch when the ignition is turned to the ON position. 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 placed in the medium speed position, the circuit continues through the heater wiring harness to the resistor assembly. This circuit then 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. The circuit then bypasses all three resistors in order to provide full power to the blower motor.
From the resistor assembly, the circuit goes to the blower motor terminal in order to operate the blower motor.
When the blower switch is placed in the medium speed position, the circuit continues through the heater wiring harness to the resistor assembly. This circuit then 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. The circuit then bypasses all three resistors in order to provide full power to the blower motor.
From the resistor assembly, the circuit goes to the blower motor terminal in order 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.