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.
1990 Ford Taurus V6-232 3.8LFACTORY OEM SERVICE PROCEDURE
Control Module HVAC: Testing and Inspection
Fig. 10 IRCM Pin Location:
Diagnosis of blower speed requires a digital volt-ohmmeter. Refer to Fig. 10 for IRCM pin location.
Fig. 11 Blower Speed Controler Diagnosis - No Blower:
1. No blower, ignition in run position. Refer to Fig. 11.
Fig. 12 Blower Speed Controler Diagnosis - High Blower Only:
2. High blower only, blower switch in low position. Refer to Fig. 12.
Fig. 13 Blower Speed Controler Diagnosis - No Variation With Blower Switch:
3. Blower operates, no variation with blower control switch. Refer to Fig. 13.
Fig. 14 Blower Speed Controler Diagnosis - CELO Inoperative:
4. Cold engine lockout inoperative. Refer to Fig. 14.
Factory Service Tools
Use the Manual With the Right Hardware
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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.