My 1994 Mark VIII has a problem with the HVAC involving the control panel on the dash. The display is intermittently going on and off. I believe whatever function is activated (air, blower, etc) is also going on and off when the display does. When the display acts up, it goes from the normal readout, to no readout, to the everything on the display lighting up, and then back to normal. It may do this a couple of times and then quit acting up for a while. This is happening intermittently and frequently. Has anyone experienced this problem and if so what do you think the culprit is? I am guessing its the control panel in the dash. What else could it be? Also, what model years will work with my 1994? Thanks for your help, Fife.