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 MANUALSMERCURY1993SABLE GS, 4D SEDAN, 3.0 U, AXODEREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEM - AUTOMATICTESTINGBLOWER SPEED CONTROLLER & HIGH-SPEED BLOWER RELAYNO BLOWER
1993 Mercury Sable GS, 4D Sedan, 3.0 U, AXODE
No Blower
1993 Mercury Sable GS, 4D Sedan, 3.0 U, AXODESECTION No Blower
- Ensure ignition switch is in RUN position, system is in AUTOMATIC mode and display is in 90°F setting.
- Change temperature setting to 60°F. If blower does not come on, go to next step. If blower motor comes on, disconnect Cold Engine Lock-Out (CELO) switch, located in heater hose before heater core. Change temperature setting to 90°F. If blower motor comes on, replace faulty CELO switch. If blower motor remains off, CELO switch wiring is shorted to ground. Repair wiring as necessary.
- Connect digital voltmeter between blower speed controller Light Blue/Pink wire (White/Purple wire on Continental) and Black (ground) wire. If reading is zero volts, check fuse and circuit wiring through high-speed blower relay. If reading is more than 10 volts, go to next step.
- Connect digital voltmeter between blower speed controller Tan/Orange wire and Black (ground) wire. If reading fluctuates at less than 3 volts, go to next step. If reading fluctuates at more than 3 volts, go to step 6).
- Connect digital voltmeter between blower speed controller Orange/Red wire and Black (ground) wire. If reading is more than one volt, replace blower speed controller. If reading is less than one volt, check for battery feed to blower motor or faulty motor.
- Connect digital voltmeter between EATC control panel pin No. 23 (Tan/Orange wire) and No. 24 (Black wire). If reading is more than 3 volts, replace EATC control panel. If reading is less than 3 volts, check circuit wiring through high-speed blower relay.
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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.