The present invention relates to a method for measuring the indoor temperature of a FATC-HVAC system for automobiles using a sonic nozzle jet pump. To describe in detail, a blower is used to measure the temperature of the interior of a vehicle using the in-car sensor used in the FATC-HVAC system. It is a device that measures the indoor temperature of a car by using the kinetic energy of the car exhaust gas discharged from the exhaust pipe without using the power as the suction method of the bet by the used power to generate the suction power to obtain the suction power of unlit power. Is a sonic nozzle pump (1) consisting of an exhaust short-circuit gear (11), an exhaust pipe (12), a nozzle (13), a sonic nozzle suction pipe (14), a non-return valve (15), and a corrugation protrusion (16), and a flexible pipe. 23, the air inlet 22 and the in-car sensor (21).
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