A governing system of an engine coolant control system in which first and second portions of coolant are pumped from an engine supplied with a gaseous fuel to a regulator and back to the engine and from the engine to a radiator and back to the engine, respectively, wherein the first portion of coolant flows through a first line from a coolant thermostat to the regulator and flows through a second line from the regulator to the engine, and wherein the second portion of coolant flows through a third line from the coolant thermostat to the radiator and flows through a fourth line from the radiator to the engine, the governing system comprising: a temperature sensor of the engine to sense coolant temperatures; an ambient temperature sensor of the radiator to sense ambient temperatures; a heating element disposed to heat the first portion of the coolant at one of a location upstream from the regulator and the regulator; a valve operably disposed along a section of piping through which the first portion of the coolant flows from the engine to the regulator; a controller which controls operations of the heating element and the valve to govern a temperature and an amount of the first portion of the coolant permitted to flow from the engine to the regulator, respectively, in accordance with the readings of the temperature sensor of the engine and the ambient temperature sensor, wherein the controller is configured to govern the amount of the first portion of the coolant permitted to flow from the engine to the regulator by proportionally opening or closing said valve disposed between the engine and the regulator, and wherein the controller is configured to govern the temperature of the first portion of the coolant permitted to flow from the engine to the regulator by switching on the heating element thereby heating the first portion of the coolant permitted to flow from the engine to the regulator in accordance with the temperature of the ambient air being relatively low as compared to a predefined temperature. a temperature sensor of the engine to sense coolant temperatures; an ambient temperature sensor of the radiator to sense ambient temperatures; a heating element disposed to heat the first portion of the coolant at one of a location upstream from the regulator and the regulator; a valve operably disposed along a section of piping through which the first portion of the coolant flows from the engine to the regulator; a controller which controls operations of the heating element and the valve to govern a temperature and an amount of the first portion of the coolant permitted to flow from the engine to the regulator, respectively, in accordance with the readings of the temperature sensor of the engine and the ambient temperature sensor, wherein the controller is configured to govern the amount of the first portion of the coolant permitted to flow from the engine to the regulator by proportionally opening or closing said valve disposed between the engine and the regulator, and wherein the controller is configured to govern the temperature of the first portion of the coolant permitted to flow from the engine to the regulator by switching on the heating element thereby heating the first portion of the coolant permitted to flow from the engine to the regulator in accordance with the temperature of the ambient air being relatively low as compared to a predefined temperature.