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 MANUALSCADILLAC1993DEVILLE BASE, 4D SEDANREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEM TROUBLE SHOOTING - AUTOMATIC
1993 Cadillac DeVille Base, 4D Sedan
A/C-Heater System Trouble Shooting - Automatic
1993 Cadillac DeVille Base, 4D SedanSECTION A/C-Heater System Trouble Shooting - Automatic
- Trouble Shooting Charts
- BCM Code F10, Outside Air Temperature Sensor Circuit
- BCM Code F11, A/C High-Side Temperature Sensor Circuit
- BCM Code F12, A/C Low-Side Temperature Sensor Circuit
- BCM Code F13, In-Car Temperature Sensor
- BCM Code F15, Solar Sensor Circuit Failure
- BCM Codes F30 &/Or F31, Display Panels To BCM Data
- BCM Code F32, Pcm-To-BCM Data Problem
- BCM Code F40, Air Mix Door Problem
- BCM Codes F46 & F47, Refrigerant System Problems
- BCM Code F48, Refrigerant System Problems
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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.