i have an 83 eldorado and the heater/climate controll doesnt work. i raise the temp till it says 90* and the heat doenst change. i heard that there was a wire that can come loose from the back of the controller, so i removed the under dash shrouds/covers, and i looked up to find this wire, but there was too much stuff in the way, so i went over to the fuse boxes and made sure that all of the fuses were all the way in, and reassembled the under dash shrouds. that night i turn my lights on, and the display for the fuel economy and the climate control turn off. so i turn my lights off, and the display come on. if i even turn the parking lights on, then display turns off. but last night, i turned my lights on, and the display for the fuel econ and the climate control was very slighty visible. i didnt remove any wires, and i didnt tinker with anything, so i have no idea what the problem could be, sorry to make this so long, but any help will be appreciated.