What is your question?
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What is your question?
My 91 gmc c1500 HVAC control panel , is it bad if when you turn it on the arrows flash and go up and down and wont let you turn it off, just keeps up and down motion flashing. There is no heat or ac just regular air. The ac wont cool and the heat wont get warm.
IF not familiar with automobile troubleshooting / diagnostic testing - seek *hands-on* assistance from qualified personnel. Good luck!