Mercedes-Benz HVAC Blower Motor Resistor - KAE 1248212151

Product Information

The HVAC blower motor regulator is an electrical control component that manages the speed of the blower motor in the vehicle’s heating, ventilation, and air conditioning (HVAC) system. By adjusting the current flow, it allows multiple fan speed settings for proper airflow through the cabin vents. Typically mounted near the blower motor or within the HVAC housing, the regulator is designed for durability under repeated thermal cycles and electrical loads.

• Blower motor only works on one speed (usually high) – a classic sign of a failed regulator.
• No airflow from vents at certain or all settings – caused by an inoperative or burned-out regulator.
• Intermittent blower operation – due to failing internal circuits or poor electrical connections.

About KAE

Kaehler Automotive Equipment (KAE) is a German manufacturer that specializes in aftermarket system relays including fuel pump relays, A/C system relays, Headlight relays, Wiper relays, and overload protection relays. KAE makes relays for most European cars including Audi, Porsche, Mercedes, Volvo, and SAAB. All design and manufacturing is done in-house in a Certified ISO 9001:2008 facility to control quality.