Maghull & Lydiate Labour Action Team is warning motorists to be extra vigilant following reports that unscrupulous thieves are striking as car owners are defrosting their vehicles.
The Labour Action Team has received reports that thieves are targeting the Maghull area during the cold spell.
The criminals are striking as people are in the process of defrosting the car.
In the reported cases, the vehicles have been left open with the keys in the ignition and the engine running.
Maghull & Lydiate Labour Action Team's Rob Owens is warning fellow motorists to beware.
Rob said: "The thieves are waiting for car owners during the morning time to open up the car and start the engine before scraping the ice from the windows.
"Once the engine is running and the owner is out of the car, the thieves are sneakily climbing in and driving off.
"The latest incident that the Labour Action Team has heard about was an older couple who were victims of the thieves.
"It isn't just a heartless thing to do, but it is dangerous."
Sudell Ward Labour Councillors Lynn Gatherer and Patrick McKinley, have contacted the police to ensure they are aware of the reported spate of car thefts.
Cllr Gatherer said: "It’s an easy thing to do to leave the engine running while scraping the ice off in the morning. But it is something which I’ll be advising everyone not to do from now on.
"Anyone with any information, or anyone who spots anything suspicious should contact the police immediately.
"No one that we are aware of has been hurt yet, but it could be extremely dangerous, particularly when you think how icy the roads are early in the morning. Anyone could slip in the way of the car, or the thief could lose control. It's a very real danger.
"The Labour Action Team is warning people to extra cautious. We need this gang to get caught, but we also need to make sure that they have no opportunity to strike in the first place."
Cllr McKinley added: "I have spoken to the local police who reinforced the fact that they do target car crime as a priority and have maintained police numbers locally to ensure that these incidents are dealt with.
"But car owners need to be vigilant and ensure that they do as much as possible to keep their vehicles secure, and that includes not leaving the car unsupervised when the engine is left running."