92 Burb 1500 2wd 5.7L - Girlfriend's truck, warm weather, unit was on Vent setting. She hit the blue A/C button, the compressor kicked in, then a few seconds later the entire Heater & A/C Control panel display went black (it's the digital-type control with flourescent display panel). Fan shut off at same time. I checked all fuses under dash, none were blown. Removed dash cover & pulled the control module out. Located '93 module with same P/N at a salvage yard for $45, plugged it in, no luck. Still blacked-out, no sign of life. Are there any other fuses, relays, fusible links in the heating & A/C system, other than at the under-dash main fuse box? It's acting like there is no power getting to that control panel/module. Could it be the ignition (key) switch? Any help or ideas will be greatly appreciated! Thanks in advance. -Dan.

92 Burb 1500 2wd 5.7L - Girlfriend's truck, warm weather, unit was on Vent setting. She hit the blue A/C button, the compressor kicked in, then a few seconds later the entire Heater & A/C Control panel display went black (it's the digital-type control with flourescent display panel). Fan shut off at same time. I checked all fuses under dash, none were blown. Removed dash cover & pulled the control module out. Located '93 module with same P/N at a salvage yard for $45, plugged it in, no luck. Still blacked-out, no sign of life. Are there any other fuses, relays, fusible links in the heating & A/C system, other than at the under-dash main fuse box? It's acting like there is no power getting to that control panel/module. Could it be the ignition (key) switch? Any help or ideas will be greatly appreciated! Thanks in advance. -Dan.pull the glove box then look for three wire plug and check the red wire most likely it has burnt connection. let me know.michelq
happy fathers day

You were absolutely right! :) Thanks a bunch. Pulled glove box, and located connector (this model has a 6-pin connector with 5 wires). Sure enough, the red wires in & out of connector pair were blackened for about 1/2 inch in both directions. clipped red wires & reconnected them directly with quick-connects, bypassing the connectors. Problem solved! Re-installed original control panel, which works fine. Now, if I can get the salvage yard to accept a return of the panel I bought from them Friday... :rolleyes: I sure appreciate the tip, thank you so much.