1994 Buick LeSabre Limited electrical problems (heater settings and radio controls). The heater temperature setting will change by itself. It will go all the way down to 60 or up to 90. It will switch into auto mode and turn the fan setting up or down. The heating system will turn itself on after being shut off. The radio will change station settings. It goes into the seek mode(?) and switches to another frequency or switches from AM to FM. It changes the volume settings all the way up or down by itself. The displays on the heater and radio will flicker slightly before going into one of it's electrical spasms. I looked for any corrosion at the ground connections at the R & L chassis wiring (under carpeting by the door openings) and the wiring connections for the ECM but found nothing.

SOURCE: Replace Cruise Control Switch in Steering Wheel

I am describing the procedure for the "On/Off" switch, I did not try the one you mention. Buy the switch anywhere ( about $15 ), then use a sharp tool ( small knife, screwdriver, anything ) to gently pry the old one from its socket. It is not glued or screwed in or anything, just squeezed tightly in the socket. Once the switch is out, pull the cable, connect it to the new one, insert back in the socket and press gently. No force necessary, it comes out easily.

SOURCE: Electrical Problem 1994 Buick Lesabre

GM usually puts the Fuse Diagram in the Back of the Owners Manual.

Alan Timperley

• 91 Answers
• Posted on May 25, 2009

SOURCE: 1994 buick lesabre heater core removal

The heater core is located under the dash, in the center. The container holding the core looks like a black plastic box. Remove the ash tray for easier access. You may have to also remove some other covers under the dash. You must first drain the radiator then you have to disconnect the hoses. There are two hoses connected to nipples of the heater core that go thru the center of the firewall. Remove the screws that hold on the cover to the heater core. Then you should be able to get the old one out. There might be a couple of other minor steps but I'm sure you can figure them out. For re-installation just go in reverse order to put it all back together.

Michael Grey

• 365 Answers
• Posted on Jun 17, 2009

SOURCE: 2001 Buick Century Limited air conditioning situation

It sounds like a actuator is bad or not getting proper vacuum to open or close on demand.
here is a diagram of your system

SOURCE: 2000 buick lesabre Heat control will not switch

their is a little motor on your duct work that moves a door open and closed to switch from heat to cool,it is called actuator motor.watch it and have someone to switch it from cool to heat to Se if the motor is turning.