Cadillac Repair: owner, climate control, warning light

Question
"I have a 1992 Cadillac Touring de Ville. The engine is 4.9L. I have many troubles with the warning light, "vehicle service soon" This Light some times is on, other times is off. I check brakes, fluids, chassis grease. Please tell me what the problem is.

Best regards


Answer
To check for CODES:

1. Turn ignition switch ON. Do NOT start the engine.

2. Simultaneously push and hold the OFF and WARMER buttons on your climate control panel for 3 seconds and release them.

3. On the display you will see LETTERS & NUMBERS appearing and the display will stop at .7.0.

4. Tell me EXACTLY everything as if you were video taping the display that you see on the display.

5. Turn ignition switch OFF.