【Auto AC Control】This AC blower motor resistor you selected is a resistor module for auto ac control!, 【Application For Chevy】2003-2006 Avalanche 1500, 2003-2006 Avalanche 2500, 2003-2006 Silverado 1500, 2003-2004 Silverado 2500, 2003-2006 Silverado 3500, 2003-2006 Suburban 1500, 2003-2006 Suburban 2500, 2003-2006 Tahoe, 2003-2006 Trailblazer, 【Application For GMC】2003-2006 Envoy, 2003-2006 Sierra 1500 ,2003-2004 Sierra 2500, 2003-2006 Sierra 3500, 2003-2006 Yukon, 2003-2006 Yukon XL 1500, 2003-2006 Yukon XL 2500, 【Application For Cadillac】2003-2006 Escalade, 2003-2006 Escalade ESV, 2003-2006 Escalade EXT, 【Application For Other Model】2004-2006 Buick Rainier, 2003-2006 Isuzu Ascender, 2003-2004 Oldsmobile Bravada, 2005-2006 Saab 9-7x, 【Replace OE Number】4P1516, 15-80567, 1580567, 93803636, 52413530, 89018778, MT1805, BMR34, 52409643, 52495874, RU-631, RU631, JA1639, 89018964, 20340, 89019351. Do check your car model in the "amazonconfirmedfit" in the top left corner before ordering. 【Advantage】All Marsflex a/c blower motor resistors meet or exceed OE design and performance. Strict testing procedure and superior materials that provide maximum strength and durability. The quality, durability and reliability of all products are backed by over 50 years of excellence in experience. It is sure to easy installation and safe operation. 【Working Principle】The blower motor resistor is an important component in an automotive heating,ventilation and air conditioning systerm ( HVAC systerm) . The ac blower motor resistor is responsible for controlling the blower motor speed. When you adjust the speed of the fan in the car, you are actually adjusting the current that the a/c blower motor resistor allows to reach the fan motor. The higher the fan speed setting, the greater the electrical flow allowed through, and the faster the fan motor speed. 【Warranty】 One-year warranty. Package includes 1 ac blower motor resistor. Do not hesitate to contact us if you have any doubts or queries.