How long will AUTOTHERM ERS systems keep a stationary truck warm?

Heating time is influenced by four main factors listed in diminishing order of influence:

  • size of engine (coolant capacity),
  • outdoor temperature,
  • wind and sun.

The main factors are coolant capacity and temperature:

  • A typical V-8 equipped car will stay warm (72° F inside temperature) for an 1¼ hour to 1½ hour when the outside temperature is at freezing.
  • A large class 7 or 8 truck with 50 to 60 quarts of coolant will stay warm for considerably longer approaching 3-4 hours.