Additional Parts & Accessories

U.S. Department of Transportation (DOT) regulations require parts and accessories such as heaters, tires, rear-vision mirrors, frames, cab and body components, horns, wheels, speedometers, and suspension and exhaust systems to be in good operating condition.


Motor vehicle heater requirements cover what heaters may not be used, as well as specification requirements for those that may be used.

The following types of heaters may not be used or installed:

  • Exhaust heaters in which the engine exhaust gases are conducted into or through any space occupied by persons (or any heater which conducts engine compartment air into any such space).
  • Heaters employing a flame that is not fully enclosed).
  • Heaters from which there could be spillage or leakage of fuel upon vehicle tilting or overturning.
  • Heaters that do not have ducts that are constructed and installed so as to prevent contamination of the air conveyed by exhaust or engine department gases.
  • Solid fuel heaters (except wood charcoal).
  • Portable heaters may not be used in any space occupied by persons, except the cargo space of motor vehicles which are being loaded or unloaded.

Heaters must also comply with the following specifications:

  • Heaters must be so located or protected as to prevent contact with occupants, unless the surface temperature of the protecting grilles or of any exposed portions of the heaters is lower than a temperature that would cause contact burns.
  • Effective guards must be provided for passenger or occupant protection from injury by fans, belts, or any other moving parts.
  • Heaters and heater enclosures must be securely fastened to the vehicle, so as to provide against relative motion within the vehicle during normal usage or in the event the vehicle overturns.  

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