Climate control will not turn off - 1995 Buick LeSabre

here could be a few reasons why your climate control system is turning on by itself when the car is off:

1. HVAC module failure: The HVAC (heating, ventilation, and air conditioning) module could be faulty and causing the system to turn on. This would need to be diagnosed and repaired by a professional mechanic.
2. Electrical issue: There may be an electrical issue in the climate control system that is causing it to turn on. This could be a problem with a relay or a wiring issue. A professional mechanic will be able to diagnose and repair this issue.
3. Remote start system: If your LeSabre is equipped with a remote start system, it could be triggering the climate control system. You should check your remote start system's manual for information on how to adjust or disable this feature.
4. Keyless entry: Some LeSabre models have a keyless entry system that can turn on the climate control system when the car is not in use. Check your owner's manual for information

It is a known issue

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may be a factory setting do u use all of the controls on the panel for air, etc?

check fuses then find out if the actual climate control is not working replace if not. test for power and resistance.

Based on the limited information provided, it would appear you have a bad climate control control board. This controls all heater/AC functions including climate control. If you're unable to change temperatures and/or fan speeds, the board is most likely bad and needs replacement.

Sounds like it's the climate control center that is bad. The display shouldn't change by itself.

Climate control need to be reset, turn all functions off and set all switches to CCW position. Disconnect battery for about 10 minutes, reconnect battery and don't touch any controls for several minutes. You may hear the climate control cycling at this time.

If the defrost is on when you turn the climate control on this is normal.Even if the temp.setting is to hot.The clutch will cycle on and off.Hope this helps.Good luck.

I had the same problem on my 2004 GMC Yukon XL.
Still under warranty the shop was able to reprogram the climate control system and tell what was wrong rather quickly with a OBD computer.
That’s when they found both of the climate control (driver and passenger) side actuators were bad and the control unit that tells the actuators where they should be was also bad.
The truck was in the shop with most all the dash, seats, consol, and steering wheel out for a week. The cost was over $1200.00.
That has seamed to fix the problem. Good Luck.

Electronics involved !
The climate control seat system is able to heat and cool the front seats. Each climate controlled seat is operated by push-buttons on the dual automatic temperature controller (EATC) located on the instrument panel. Each front seat temperature is then monitored and controlled by the dual climate control seat module (dual CCSM) located underneath the passenger front seat cushion.

Both the driver and front passenger climate controlled seats are independently controlled electronically by the dual climate controlled seat module (CCSM) mounted to the bottom of the passenger seat cushion. The climate controlled seat system only operates with the engine running, however, if using a diagnostic tool to command the dual CCSM, diagnostic testing can be carried out with the ignition switch key ON engine OFF (KOEO). The system receives power from central junction box (CJB) fuse 118 (30A) through circuit 1153 (RD/BK) feeding battery voltage into dual CCSM C3265b pins 1 and 24. If power is disconnected from either pin 1 or 24 of dual CCSM C3265b, only 1 seat will be disabled (pin 1 for driver seat, pin 24 for passenger seat), the other will remain operational. Since both climate controlled seats operate independently, if a fault occurs setting a DTC specific to either climate controlled seat, only the affected seat will be disabled by the module and the other will remain operational.

Sorry , but it would be best for you to take it to the dealer or someother qualified repair shop.