It will only heat up if power is being used, but it could also mean that the adapter is bad.
check with a multi tester inside for red and outside for black, check to see if you are getting at least 15 volts or higher voltage.
make sure you set the multitester to VDC, Thats Direct Current Voltage or DC voltage.
if you are getting power thru the adpater head try wiggling the tip a bit to see if theres a broken wire inside the head Adapter head tends to break at the tip sometimes.
if your getting power then you might have a broken adapter plug in the laptop, you might a suitable adapter plug at a electronic store or ebay, might need or reqiure some soldering on the board if you dont know how to solder i suggest you leave it to the PRO's.
if no power coming from the adapter then time to replace the adapter, i figure adapter last about 1-2 years before they need replacing due to wear and tear and neglect. If you do not take care of your electronics they will not take care of you!.
Good luck
I’m happy to help further over the phone at
https://www.6ya.com/expert/david_92c86cbc79e9b552