Your heat is stuck on one temperature — or the A/C won’t respond no matter what you set. On 4th Gen Ram trucks, a failed blend door actuator is the most common cause. This is the OEM Mopar replacement, direct factory spec.Part Number: 68448026AAFits: 2009–2022 Ram 1500 (Single Zone & Dual Zone) 2010–2018 Ram 2500 & 3500 (Single Zone & Dual Zone) How many do you need? Single Zone cab: 4 actuators total (4× 68448026AA) to fully rebuild the HVAC box Dual Zone cab: 5 actuators total (5× 68448026AA) to fully rebuild the HVAC box Rear vents: no extra actuators needed — rear vents are additional ductwork only, not actuator-driven Single Zone vs. Dual Zone — which do you have?Single Zone trucks control driver and passenger temperature together. Dual Zone allows independent driver/passenger temperature control. Check your HVAC control panel — Dual Zone trucks have separate driver/passenger temperature controls.Why replace it? Heat or A/C stuck at one temperature regardless of dial position Clicking or ticking noise from behind the dash Temperature control unresponsive or intermittent One side of the cab heating or cooling differently than the other (Dual Zone) OEM Mopar quality. Direct plug-and-play fit. No programming required. Fast shipping from Ram Parts USA.