F21-1028-1341 | Genuine Paccar HVAC Climate Temperature Control Module

Description: An HVAC Climate Temperature Control Module F21-1028-1341 is the electronic unit that controls your vehicle’s heating, ventilation, and air conditioning (HVAC) system. HVAC Climate Temperature Control Module For Kenworth T680, T880, T660 Peterbilt 579, 576. Part Number: F21-1028-1341 Condition: New Manufacture/Brand: Paccar Fits F21-1028-1341 For    Kenworth trucks Kenworth T680 Kenworth T880 Kenworth T660 (some configurations)   Peterbilt trucks Peterbilt 579 Peterbilt 567 Other modern Peterbilt models with PACCAR HVAC systems Purpose of using F21-1028-1341:  1. Maintain desired temperature Lets you set a specific temperature The module automatically adjusts heating or cooling to keep it steady  2. Control heating and air conditioning Turns the A/C system on/off Regulates heat from the engine (heater core) Mixes hot and cold air for the right balance  3. Manage airflow and fan speed Controls how strong the air blows Adjusts fan speed automatically or manually  4. Direct air where needed Sends air to: Dashboard vents Floor Windshield (defrost)  5. Improve driver comfort and safety In vehicles like the Kenworth T680: Keeps the cab comfortable in all weather Prevents windshield fogging (defrost function) Reduces driver fatigue on long trips  6. Enable automatic climate control Uses sensors (inside temp, outside temp, sunlight) Adjusts everything automatically without constant input  7. Optimize system efficiency Prevents unnecessary A/C or heating use Helps reduce fuel or energy consumption Signs of a Bad HVAC Climate Temperature Control Module F21-1028-1341:  1. Temperature won’t change Stuck blowing only hot or only cold air No response when adjusting temperature settings  2. Fan/blower issues Fan not working at all Only works on one speed Fan speed changes randomly  3. Airflow stuck in one position Air only comes from one area (e.g., defrost only) Can’t switch between vents, floor, or windshield  4. A/C not turning on No cold air even when A/C is selected Compressor doesn’t engage  5. Unresponsive controls Buttons, knobs, or touchscreen don’t respond Delayed or erratic response to inputs  6. Intermittent operation Works sometimes, then suddenly stops May change behavior while driving  7. Incorrect or fluctuating temperature Cabin temperature doesn’t match the setting Random hot/cold air swings  8. Warning lights or fault codes HVAC-related error codes (in modern vehicles) Communication issues with other modules  9. Electrical issues Blown fuses related to HVAC Burning smell (rare but serious)   About the Manufacturer – Paccar: PACCAR Inc is a global technology leader in the design, manufacture, and customer support of premium light-, medium-, and heavy-duty trucks. Founded in 1905 and headquartered in Bellevue, Washington, PACCAR is best known for its world-class truck brands: Kenworth, Peterbilt, and DAF. PACCAR’s trucks are recognized for their durability, fuel efficiency, advanced engineering, and driver-focused technology. In addition to truck manufacturing, PACCAR also designs and builds diesel engines, and provides financial services, information technology, and aftermarket support to its global customer base.