The light on the Front button on my A/C unit blinks yellow for a minute or two when I turn on the vehicle. While it's blinking I can't do anything with the controls on the A/C unit.

Once the lights quits blinking, the A/C unit always shows the temperature is set to 75 and the fan is off but I can then control the unit completely and it works fine. This has been going on for about a week.

Any ideas?

 

Might be a problem with the AC compressor solenoid or A/C amplifier.

The climate unit should have diagnostic system similar to the engine but will need a code reader.