The 23-year-old victim and another person got out of a vehicle parked in the 700 block of North Kedzie when they were approached by three other people.
For at least the third time in a week, thieves have targeted large air conditioning units in the south suburbs.
A public library in Robbins and a school in nearby Blue Island have been hit by air-conditioner thieves.
The Acorn Public Library in south suburban Oak Forest is closed Tuesday because of a Freon gas leak from the heat and air-conditioning system.
Some new visitors have been spotted in downtown Elgin. Once threatened, now flourishing, bald eagles have been seen not far from the public library.