Abstract: A carpet cleaning machine mounted on a truck or van for transport to the work site. The main power for the machine is developed by an internal combustion engine which drives an injection pump, a vacuum pump, and a sump pump. A reservoir maintains and stores a supply of cooling water-cleaning fluid for removing heat generated by the engine. Coolant-cleaning fluid is drawn from the engine by the injection pump for transmission to the carpet cleaning injection nozzles. The coolant may be further heated as it is drawn from the engine by means of a heat exchanger which removes heat from the engine exhaust gases. The coolant may be further heated by deliberately employing an inefficient injection pump. The vacuum pump draws water from the carpet through a filter or sump which may be discharged through the sump pump when a predetermined coolant level is achieved in the sump.