I have a 92 chev work truck and the display for heat and air is blank. I have checked all fuses and they appear to be good. Could this be a computer chip gone bad and if so how much do they cost.

Try unplugging the wiring harness to the heater/ac conrol head for a minute then plug it back in, (they have poor contacts and tend to get loose)

I have A 92 chevy w/the same problem w/ the radio. I unpluged it and bent the contact pins and it has worked fine .

my buddy has a 92 that his heat crapped out on himin the dead of winter. eventually we tracked it down to his connectors that had fryed. they were melted down to almost nothing so you might want to give that a whirl.