CHFD 231 requested to respond mutual aid to Varna for a car on fire near a house. While enroute 1984 updated with a "working car fire with no exposures". 231 arrived on scene to find engine compartment well involved, well away from any structures. 231 crew deployed a handline and extinguihed the fire. No extension into the passenger compartment. Use TIC to find and cool hotspots. Released by Varna 1984. All CHFD units clear back in service.