My 2005 Expedition has a push button A/C switch with an orange light that indicates whether the A/C compressor currently has voltage or not in the current mode of the temperature control system. Pushing the switch turns on/off the orange light (activates/deactivates compressor) depending on its current state.

I believe (not 100% sure) that the orange light by default is on when the "mode selection ****" is positioned on Defrost. The operator could then push the A/C button to de-energize the A/C compressor and turn out the orange light on the push button A/C switch and run defrost without the compressor running.

The above is my recollection. Currently, in the Defrost position, the A/C push button switch light is out and pushing the switch does not turn the light on. Yet the A/C compressor is energized in the Defrost position all the time.

Can someone with an Expedition let me know if my recollection of how it should work is correct (and thus I have an issue) or if it is currently working correctly (and thus I'm imagining things about how it used to work)?

I'd really appreciate that!! Thanks very much!!

 

Which climate control do you have - manual or auto?

If a manual, when the mode is in MAX A/C, DEFROST or FLOOR/DEFROST positions, the A/C compressor will be operational regardless of the A/C request switch status.

 

I guess it is manual, but the light is lit in all positions you mentioned except Defrost. In Defrost the light is off but the AC compressor is on. In the other modes the light is lit and goes out if the button is pressed. This also turns off the compressor.

 

What I quoted was straight out of the service manual. If the compressor works as described, it's working correctly and the state of the light is irrelevant.

Have you read your owner's manual to see what it says?