Climate Control LCD
 

Can anyone help...?
The LCD in-dash display in my 380 has the front demister light and directional arrow flashing on and off. There is a sound coming from the dash at the same time which sounds like something swithcing on and off. The strength of the air flow through the vents also seems to increase and decrease in time with the flash or the lights on the display. Mitsubishi Service Department hooked up to test equipment but found nothing. Unfortunately, the display doesn't alway have these lights on and everything seems to run fine at times. The air cond is still cold. Has anyone experienced this problem and what needs to be done to fix it?