The bottom hvac controls went blank. The lights at the bottom where you see outside air illuminated went off. I could not chamge the heater, fan, blower, etc. The lights above the instrument panel remained on. I did succeed in turning off the hvac system but then could not turn it back on. I shut the car down a few times and then started driving. All power came back and it is now working fine. Fixing this is the mission if you choose to accept.
ANYONE EXPERIENCE THIS PROBLEM ??

 

Hmm, you said you have this issue in your 1998 Chevy C10 cargo van?