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Passenger compartment fan speed regulator: replacement and selection

When and why passenger compartment fan speed regulator needs replacement

This element has no specified operation lifetime limit. The component is replaced in case of break of fuse circuit or its short circuit. Also necessity of element replacement occurs in case of serious thermal damage.

Short circuit in the component can take place due to excessive load, which is a result of fan malfunction. In addition, incorrect operation of the regulator can be caused by cabin filter clogging. This is because normally the fan speed regulator should be cooled by flow of air, which is supplied into the passenger compartment. If the cabin filter is not replaced timely, then volume of air coming to the cabin will be reduced. Thus, blower motor resistor gets overheated and damaged.

At breakage of circuit and severe thermal damage of the component the fan won’t turn on. And if short circuit occurs in the fuse, then blades rotation speed will be unstable. Also, absence of reaction of the fan to its speeds switching or its random activation even at turned off ignition will be possible.

Peculiarities of component replacement depend on car construction. Along with this, installation of a new element in most cases requires removal of the glove box and its lower cover together with a lamp, servomotor of an air recirculation flap. If necessary, the cabin filter is replaced together with the regulator. Also you need to estimate condition of the fan, and perform repair if it is damaged.

How to select passenger compartment fan speed regulator

In order to make the blower motor resistor serve you for a long time, purchase a product from a proven firm. For instance, high-quality components are produced under such brands as VEMO, Febi Bilstein, Metzger.

Buying the part be guided by car technical characteristics. For instance, you need to consider the car brand, model, production year, body type, configuration version, presence and type of the air-conditioner. Properly selected part will conform by length, width, height, quantity of contacts for connection and operating resistance value.