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 MANUALSFORD1999WINDSTAR BASE, VAN CARGO, 3.8 4REPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHVAC SYSTEM - MANUALTROUBLE SHOOTINGTEST K: MAIN BLOWER OPERATES IN HIGH SPEED ONLY
1999 Ford Windstar Base, Van Cargo, 3.8 4
Test K: Main Blower Operates In High Speed Only
1999 Ford Windstar Base, Van Cargo, 3.8 4SECTION Test K: Main Blower Operates In High Speed Only
- Retrieve DTCs
Check for DTCs. If any DTCs are present, see PRELIMINARY INSPECTION . If no DTCs are present go to next step. - Check Blower Motor PID 1681
Turn ignition to run (engine off). Turn blower motor off. Perform blower motor PID 1681. If blower motor PID 1681 reads ACTIVE, problem is in instrument cluster. See appropriate INSTRUMENT PANELS article in ACCESSORIES & EQUIPMENT. If blower motor PID 1681 does not read ACTIVE, go to next step. - Check Tan/Black Wire For Short To Ground
Turn ignition off. Disconnect front blower motor relay harness connector. Using ohmmeter, measure resistance between ground and blower motor relay harness connector Brown White wire. If resistance is more than 10,000 ohms, go to step 5) . If resistance is less than 10,000 ohms, go to next step. - Recheck Tan/Black Wire For Short To Ground
Disconnect Front Electronic Module (FEM) harness connector (C346) located behind left side of instrument panel. Measure resistance between ground and blower motor relay harness connector Brown White wire. If resistance is more than 10,000 ohms, replace FEM. Retest system. If resistance is less than 10,000 ohms, repair Tan/Black wire. Retest system. - Check Pink/White Wire For Short To Battery
Disconnect front blower motor harness connector. Using voltmeter, measure voltage between ground and blower motor relay harness connector Pink/White wire. If voltage is more than 10 volts, repair Pink/White wire. Retest system. If voltage is less than 10 volts, replace front blower relay. Retest system.
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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.