Ground circuits are bolted to some part of the engine so if any was disconnected while removing bolts, they could have been missed out.
As to the overheating and A/C not working, it could be a blown fuse so did you check as I suggested? Sometimes jumping the gun makes you go round in circles. Always start with the basic. A blown fuse would prevent the cooling fans from working and this would result in overheating and tha A/C not working. Btw recheck the wiring connectors that you disconnected. Check if any had been interchanged. Note the wire colors.
You mentioned disconnecting the battery. That can result in low idling as computer memory is erased and needs to relearn. During this time the idling would not be stable and might stall. One way of expediting it is to get the throttle body cleaned to eliminate air flow restriction due to dirt accumulating.
Saturday, June 16th, 2012 AT 2:23 PM