During cold starts, liquid propane gas (LPG) fuel systems in motor vehicles do not supply gas fuel to the combustion chamber, as the liquid fuel must first be converted to a gaseous state in a reducer-evaporator (RP) connected to the internal combustion engine's cooling system. The subject of the proposed invention enables the initiation of the crystallization process of supercooled liquid in latent heat reservoirs forheating the evaporator in an LPG (liquefied petroleum gas) automotive system.