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 MANUALSCHEVROLET1985C 20 P/U 2WD V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESPOSITIONSEFE SOLENOID
1985 Chevrolet C 20 P/U 2WD V8-350 5.7L
EFE Solenoid
1985 Chevrolet C 20 P/U 2WD V8-350 5.7LSECTION EFE Solenoid
The SCAN tool displays the on/off status of the EFE system. When the ignition switch is on and coolant temperature is low, the ECM completes the EFE solenoid ground path, energizing the solenoid, which in turn energizes the heater grid. When temperature increases, the ECM opens the solenoid ground path and the EFE heater is turned off.
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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.