Reheating method for operating a refrigeration system with a heat pump function for a motor vehicle, wherein the refrigeration system comprises: a refrigerant compressor which can be connected or is connected to a primary line and a secondary line ; an external heat exchanger which is arranged in the primary line ; an evaporator which is arranged in the primary line ; a heating register which is arranged in the secondary line ; at least one reheating expansion valve (AE4), which is arranged between the heating register and the external heat exchanger in the secondary line ; wherein in the reheating method the refrigerant, starting from the refrigerant compressor flows through the following components in the refrigeration system one after another: heating register and reheating expansion valve (AE4) in the secondary line, external heat exchanger and evaporator in the primary line , wherein the reheating method comprises the following steps: determining (S503) a heat differential value (Wdiff) by comparing a heat emission actual value (Wist) at the heating register to a heat emission target value (Wsoll), characterized by an adjusting (S506) of at least one operating setting of the refrigeration system , so that the load capacity in the refrigeration system is increased if the heat differential value (Wdiff) is greater than 0 and less than a heat differential threshold value (Wds), wherein the adjusting of the operating setting comprises: measuring (S507) the temperature of the supply air after flowing through the evaporator and reducing a target temperature (SP T_Verd) for the temperature of the supply air after flowing through the evaporator . a refrigerant compressor which can be connected or is connected to a primary line and a secondary line ; an external heat exchanger which is arranged in the primary line ; an evaporator which is arranged in the primary line ; a heating register which is arranged in the secondary line ; at least one reheating expansion valve (AE4), which is arranged between the heating register and the external heat exchanger in the secondary line ; wherein in the reheating method the refrigerant, starting from the refrigerant compressor flows through the following components in the refrigeration system one after another: heating register and reheating expansion valve (AE4) in the secondary line, external heat exchanger and evaporator in the primary line , wherein the reheating method comprises the following steps: determining (S503) a heat differential value (Wdiff) by comparing a heat emission actual value (Wist) at the heating register to a heat emission target value (Wsoll), characterized by an adjusting (S506) of at least one operating setting of the refrigeration system , so that the load capacity in the refrigeration system is increased if the heat differential value (Wdiff) is greater than 0 and less than a heat differential threshold value (Wds), wherein the adjusting of the operating setting comprises: measuring (S507) the temperature of the supply air after flowing through the evaporator and reducing a target temperature (SP T_Verd) for the temperature of the supply air after flowing through the evaporator . determining (S503) a heat differential value (Wdiff) by comparing a heat emission actual value (Wist) at the heating register to a heat emission target value (Wsoll), characterized by an adjusting (S506) of at least one operating setting of the refrigeration system , so that the load capacity in the refrigeration system is increased if the heat differential value (Wdiff) is greater than 0 and less than a heat differential threshold value (Wds), wherein the adjusting of the operating setting comprises: measuring (S507) the temperature of the supply air after flowing through the evaporator and reducing a target temperature (SP T_Verd) for the temperature of the supply air after flowing through the evaporator . <EOS>