Abstract: The invention provides a method and device for detecting the state of an air filter in a ventilation system of the passenger compartment of an automobile vehicle. The installation is put into operation in a given mode and a parameter of an air flow emitted into the passenger compartment by an air nozzle of the installation is measured by means of a measurement device filled with a collector. The measured value of the parameter is then compared with a reference value, to determine whether or not the filter needs to be replaced.
Abstract: In a method of diagnosing an air-conditioning loop of a motor vehicle an undercooling value is determined from parameters of the loop. An overheating value is determined from parameters of the loop. The undercooling value is compared with minimal and maximal values. The overheating value is compared with minimal and maximal values. The comparison results are processed to provide information about the operational status of the loop.
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