Why the power connector is overheating?

"I have this problem too. When I got this problem I searched about this and saw many users had this issue. Seems like Apple doesn't care about their faulty charger. I doubt that do they really have a proper engineering team to fix this issue . I felt bad now being a mac user first time by seeing this issue persisting for a very long period of time.

Extending warranty doesn't make sense if you get the same designed charger again, because anyways its going to get the same issue in few days."

"I found a probable cause and solution! Once I was sure there was no warrantee in affect

The over heating seems to come from the MagSafe connection shorting out due to corrosion build up. I used a hard plastic picker to remove as much of the corrosion as possible.

Also, I took small pieces of tape and pressed them into the recessed area to remove small pieces of metal that had begun to collect to the magnet preventing a tight connection of the electrical points.

When I was no longer able to get good clean points, I found just the MagSafe connector and cord on Amazon for about 10% of the original price!

I used but joint crimp connectors and shrink tubes to assemble everything! Now I keep a small piece of gaffers tape over the recessed area to keep metal bits from collecting to the magnet"

"I bought mine refurbished. They would not send the grounding part of the cord, just the box and small diameter cord. They said they had had a problem with them heating up when used as a unit.

A couple of times I have forgotten and plugged into an extension cord (heavy duty -12g) and OUCH too hot.

Using only the square plugged into the wall & connected with the magsafe I haven't had it get overly hot."

What heats up connectors? Poor connections caused by high resistance. That drops voltage and produces heat. It can be caused by corroded, loose contacts, or bad connections like bad welds or solder joints. Troubleshoot those causes.