Thieves have been targeting unlocked cars in Poynton.
Four cars were hit overnight between Saturday and Sunday by opportunistic thieves in Dickens Lane, Barnaby Road and Clumber Lane.
Sat Navs and electrical equipment were taken.
Police are urging motorists to secure their vehicles.
Anyone with any information should call 101 or Crimestoppers, anonymously, on 0800 555 111.