Keep every fan setting working across the climate system with the Standard Ignition HVAC Blower Motor Resistor RU-566 (also written RU566). This front resistor manages the current feeding the blower motor to set its different fan speeds, and it's specifically designed for Mercedes-Benz applications. When some speeds drop out and the fan only runs on high (or not at all), a failed resistor may be the cause — this drops in as a direct-fit replacement for the listed vehicles.
Fits a wide range of Mercedes-Benz models, including the 2002-2012 G500, 2003-2012 SL500, 2002-2007 C230, 2003-2009 E320, 2000-2006 CL500, 1999-2006 S500, 2005-2011 SLK350 and the 2005-2009 SLR McLaren, plus the 2003 Maybach 57 and 62 — see the Buyer's Guide tab for the full list of 56 applications.
Interchange: RU1259 · JA1751 · BR469 · 1638200597 · 2038214058 · 2038218651 · 203821865164 · 2208210951 · 2308210251 · 230821025164 · 2308216351 · 2308216451
This part cross-references / interchanges with the following part numbers:
What does this blower motor resistor do?
It manages the current supplied to the HVAC blower motor to set the different fan speeds, providing variable speed control for the A/C and heater.
What are the signs this resistor may need replacing?
Losing one or more fan speeds — commonly the blower only works on high, or stops working entirely. Have the cause diagnosed, as other components can produce similar symptoms.
Will the RU-566 fit my vehicle?
It's a direct-fit replacement designed for the listed Mercedes-Benz applications, plus the 2003 Maybach 57 and 62. Check the Buyer's Guide tab to confirm your year, make and model.
Where is this resistor located?
This is the front resistor for the vehicle's HVAC system. Consult your service information for the exact access point on your model.
What connectors does it use?
It uses premium copper electrical connectors for more precise resistance values, which supports better resistor performance and longer part life.
WARNING: These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
