Abstract: An electric auxiliary heating system for a natural gas powered vehicle having a natural gas engine is provided to maintain a cab temperature upon cessation of operation of the natural gas engine. The present system selectively circulates previously heated coolant to an existing cab heating circuit to maintain a desired cab temperature, wherein upon the coolant temperate cooling to a predetermined temperature the auxiliary heating system initiates heating with electric heaters in a reservoir to provide heating of the coolant. A controller provides for the initiation and termination of the auxiliary heating corresponding to selected predetermined thresholds as well as a sensed oil pressure generated by the natural gas engine.