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 MANUALSCHEVROLET1993SPORTVAN G20, 5.7 KREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEM - MANUALTESTINGBLOWER MOTORMEDIUM-HIGH SPEED
1993 Chevrolet Sportvan G20, 5.7 K
Medium-High Speed
1993 Chevrolet Sportvan G20, 5.7 KSECTION Medium-High Speed
- Turn ignition switch to RUN position. Place blower switch in position which does not operate. Connect test light from wire of inoperable blower switch position at blower motor resistor connector to ground. LO position is Yellow wire, medium-low position (detente next to LO) is Tan wire and medium-high position (detente next to HI) is Light Blue wire.
- If test light glows, go to next step. If test light does not glow, repair open circuit in appropriate wire (depending on switch position) between blower switch and blower resistor (located on A/C evaporator housing). See WIRING DIAGRAMS .
- Connect a fused jumper from appropriate wire (depending on switch position) to Dark Blue wire at blower resistor connector (located on A/C evaporator housing). If blower motor does not run, go to next step. If blower motor runs, replace blower resistor.
- Connect a fused jumper from Dark Blue wire at blower resistor connector to Dark Blue wire at high blower relay connector (located on A/C evaporator housing). If blower motor does not run, replace high blower relay. If blower motor runs, repair open circuit in Dark Blue wire between blower resistor connector and high blower relay connector. See WIRING DIAGRAMS .
RENDER: 1.0x
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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.