My daughter has an '04 Colorado. She says the dash lights and radio goes haywire and sometimes goes blank. When this happens I will disconnect the positive battery terminal and this seems to clear the problem for awhile. Just replaced the battery and it was about to explode from being swollen. It was also very hot to touch. Parts house had never seen a battery in this kind of shape. What could be causing this problem and could it be related to the battery problem?

 

Sounds like the battery is being overcharged. Check the charging system.