James Driscoll, motor claims manager at Aviva, said the issue is becoming a consistent source of claims during colder months. “In the winter months, mice and rats look for warmer places to nest and they can squeeze into the tiniest of gaps, including the grilles, vents or open windows of vehicles. Once inside a car, rodents can cause significant damage, from chewing wires and gnawing at interiors, to nesting in engines,” he said.