HVAC BLEND DOOR ACTUATOR - controls the temperature of air blowing into the interior of the vehicle. This part commonly fails on popular Ram 1500, Ram 2500, and Ram 3500 models. It usually produces a clicking or popping sound during operation when faulty, which results in incorrect AC or heater temperatures inside the vehicle. | COMPATIBLE REPLACEMENT FOR DODGE RAM TRUCKS - 1999, 2000, 2001, 2002 Ram 1500 Main | 1999 2000 2001 2002 Ram 2500 Main | 1999-2002 Ram 3500 Main |. If the blend door actuator fails, the air conditioning and heating system may not function properly, resulting in uncomfortable temperatures in your car. | REPLACES PART NUMBERS - 604-018, 604018, 604 018, 5012924AA, 5104879AA commonly found on popular Ram 1500, Ram 2500, and Ram 3500 including year models 99, 00, 01 and 02. If you are unable to change the direction of the air in your vehicle, then you may have a problem with your A/C blend door actuator. | OEM FIT, QUALITY & FINISH - While this is not a genuine OEM part, it is a direct replacement and will fit and work exactly like the factory part. This replacement air temperature door actuator manufactured by AA Ignition features a redesigned housing and a rugged circuit board to ensure it lasts longer than the factory part. | LIFETIME WARRANTY - This replacement blend door actuator comes complete with a lifetime warranty. If the part ever fails on your Ram 1500, Ram 2500, or Ram 3500 diesel truck, simply contact us for a free replacement. Save time and money by purchasing this actuator and replacing the part yourself.