Abstract: A self-contained heated vacuum system designed for mounting in a vehicle, including a liquid-cooled engine, a shaft-driven blower, dual, counter-flow heat exchangers, engine exhaust diversion assembly, a temperature-controlled vacuum switch, and a three way toggle switch. Dual heat exchangers, a low pressure engine coolant heat exchanger and a high pressure engine exhaust heat exchanger, heat cleaning solution. In order to limit solution output temperatures, a diversion assembly may channel engine exhaust to bypass the high pressure engine exhaust heat exchanger and travel directly to a muffler by which it is expelled from the vacuum system. When actuated, a vacuum switch pulls a flapper valve located in the diversion assembly that redirects engine exhaust. Vacuum switch temperature selection is controlled by a three-way toggle switch, which presets the possible switching temperatures and alternately selects the operational temperature from among them.