HVAC Air Temperature Controller Switch Unit Replace Q21-6012

Product Description This HVAC Air Temperature Controller Switch Unit is designed for listed Peterbilt truck applications. It helps restore cabin air temperature adjustment, heater and A/C control response, fan operation support, and airflow control for improved driver comfort. Vehicle Compatibility for Peterbilt 357 2006-2007 for Peterbilt 378 2006-2010 for Peterbilt 379 2006-2010 for Peterbilt 385 2006-2015 for Peterbilt 386 2006-2015 for Peterbilt 365 2006-2020 for Peterbilt 367 2006-2020 for Peterbilt 388 2006-2020 for Peterbilt 389 2006-2024 for Peterbilt 384 2008-2015 for Peterbilt 325 2011-2020 for Peterbilt 330 2011-2020 for Peterbilt 335 2011-2020 for Peterbilt 337 2011-2020 for Peterbilt 348 2011-2020 Replace Part Number Replace Q21-6012 Functionality & Features This HVAC air temperature controller switch unit helps manage cabin climate control functions, including temperature adjustment, A/C and heater control response, fan operation support, and airflow mode selection. It is built to replace a damaged, worn, cracked, loose, unresponsive, or malfunctioning HVAC control switch unit. Designed for listed Peterbilt heavy-duty truck applicationsHelps restore air temperature adjustment and HVAC control responseSupports heater, A/C, fan operation, and airflow control functionsBuilt to replace a damaged, cracked, worn, loose, unresponsive, or failed controller switch unitHelps reduce poor temperature control, intermittent HVAC response, stuck switches, and abnormal cabin climate issuesProfessional installation and HVAC system inspection are recommendedCommon Fault Symptoms A faulty HVAC air temperature controller switch unit may cause the following problems: A/C or heater control does not respond properlyCabin temperature cannot be adjusted normallyFan speed or airflow mode works intermittentlyButtons, knobs, or switches feel loose, stuck, worn, or difficult to operateCabin air output does not match the selected control settingHVAC system works intermittently or stops respondingControl unit housing is cracked, damaged, faded, or has poor electrical contactPackage Includes 1 x HVAC Air Temperature Controller Switch Unit 1 Pair x Professional Black Protective Gloves After Sales Service Velocitrans is committed to providing reliable heavy-duty truck replacement parts and professional customer support. Please confirm the listed OE number, control unit appearance, connector style, switch layout, installation position, and vehicle application before ordering. If you have any questions about fitment, installation, or product issues, please contact us and we will provide assistance as soon as possible.

• 【Vehicle Compatibility】for Peterbilt 357 2006-2007, for Peterbilt 378 2006-2010, for Peterbilt 379 2006-2010, for Peterbilt 385 / 386 2006-2015, for Peterbilt 365 / 367 / 388 2006-2020, for Peterbilt 389 2006-2024, for Peterbilt 384 2008-2015, for Peterbilt 325 / 330 / 335 / 337 / 348 2011-2020. Please confirm your truck model, year, connector style, switch layout, and product appearance before ordering.
• 【Replace Part Number】Replace Q21-6012. Please compare the listed part number, control unit shape, button and knob layout, connector style, mounting points, and installation position with your existing HVAC switch unit to help ensure proper fitment.
• 【HVAC Temperature Control Function】This HVAC air temperature controller switch unit helps manage cabin temperature adjustment, heater and A/C control response, fan operation support, and airflow mode selection for listed Peterbilt trucks.
• 【Reliable Climate Control Replacement】Built to replace a damaged, cracked, worn, loose, unresponsive, or malfunctioning HVAC controller switch unit. Helps restore normal switch response and cabin climate control performance.
• 【Helps Solve Common HVAC Problems】Helps fix A/C or heater not responding, poor temperature control, intermittent fan or airflow operation, stuck switches or knobs, abnormal cabin air output, and damaged control panel issues.
• 【Package Includes】1 x HVAC Air Temperature Controller Switch Unit and 1 Pair of Professional Black Protective Gloves to ensure clean handling and hand safety during your maintenance routine. Velocitrans provides professional customer support for fitment, installation, or product issues.