Patent ID: 7406929

Claim:
A cooling circuit of an internal combustion engine of a motor vehicle having a main cooling circuit, comprising: a main radiator ( 5 a ), a section ( 3 ) located upstream of the radiator, a radiator return flow section ( 8 ), a coolant pump ( 10 ), a main thermostat ( 2 ) and a bypass or short circuit ( 4 ) between the main thermostat ( 2 ) and the coolant pump ( 10 ), and a low-temperature circuit, comprising a low-temperature radiator ( 5 b ), a low-temperature radiator return flow section ( 11 ), a valve unit, and an additional heat exchanger, wherein the low-temperature radiator ( 5 b ) is connected in parallel with the main radiator ( 5 a ); wherein the main thermostat ( 2 ) is arranged in the section ( 3 ) located upstream of the radiator; and wherein the valve unit is embodied as a mixing thermostat ( 14 ) with a first inlet, a second inlet, and one outlet, wherein the first inlet and the outlet are connected into the return flow section ( 11 ) of the low-temperature radiator ( 5 b ), and the second inlet is connected to the main thermostat ( 2 ).