Temperature Control Lock-Out Valve & Switch Assembly
WARNING: This page is about a different car, the 1994 Lincoln Mark VIII. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Temperature control lock-out valve and switch assembly may also be referred to as Cold Engine Lock-Out (CELO) switch.
- Ensure engine is warm. Turn ignition on. Press AUTOMATIC button. Set temperature setting to 90°F (32°C). Change temperature to 60°F (16°C). If blower motor operates, go to next step. If blower motor does not operate, go to step 3).
- Unplug temperature control lock-out valve and switch. Change temperature to 90°F (32°C). If blower motor operates, replace faulty temperature control lock-out valve and switch assembly. If blower motor does not operate, repair grounded Yellow/White wire to temperature control lock-out valve and switch assembly.
- Check voltage between Brown/Orange wire and Black wire at Blower Speed Controller (BSC) connector. If voltage is greater than 10 volts, go to next step. If voltage is 10 volts or less, check switch circuit fuse and switch circuit continuity. Repair or replace as necessary.
- Check voltage between Tan/Orange wire and Black wire at BSC connector. If voltage is greater than 3 volts, go to step 6). If voltage is 3 volts or less, go to next step.
- Check voltage between output wire to motor and Black wire at BSC connector. If voltage is 1 volt or greater, replace BSC. If voltage is less than 1 volt, replace blower motor and/or repair output wire to motor.
- Check voltage between EATC module connector terminal "C" (Tan/Orange wire) and terminal "D" (Black wire). If voltage is greater than 3 volts, replace EATC module. If voltage is 3 volts or less, check circuit continuity. Repair circuit as necessary.