Police are warning motorists to be wary of thieves when clearing ice from vehicles following another car theft.
A red Vauxhall Corsa was stolen from a drive in Clos Cwm Golau in Merthyr Tydfil on Tuesday morning.
Police said the 27-year-old owner had momentarily gone back into his house to wait for frost to clear from his car windows.
It is the third such theft being investigated by South Wales Police during the recent cold spell.
Officers say motorists should not leave their vehicle unattended with the engine running when clearing ice.
The previous thefts were in Cardiff and Nantgarw.
Insp Andy Evans said: "The cold weather brings about extra opportunities for crime.
"Criminals have easy pickings as people in a rush to get on with their day leave vehicles unattended whilst they clear ice from windows in the mornings.
"But taking simple measures, like giving themselves extra time to clear any ice, means people are less likely to leave vehicles unattended, which will help protect their property."
It is believed that the person responsible for the theft in Merthyr left a bicycle at the scene.
Anyone with information is asked to contact Merthyr police station on 101 or Crimestoppers on 0800 555 111.