The invention relates to a power transmission system (1) with a heat engine (7),A turbocharger (8),A pump (9),A water outlet housing (10),A radiator (3), a heat exchanger (4) and a heat transfer circuit (11) in which the heat transfer fluid circulates, including a first section (14) at the outlet of the heat engine (7), on which the turbocharger (8) is mounted,Second paragraph (15),Connect the water outlet housing (10) to the hot air (4),The heat transfer circuit (11) is provided with a third section (16) for installing the pump (9),Having a third stage inlet on the first stage (14) upstream of the turbocharger (8) and a third stage outlet on the second stage (15),The first section (14) is connected with the third section (16) downstream of the pump (9), and a check valve (30) is arranged on the second section (15) upstream of the outlet of the third section (16).Figure 1
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