{"product_id":"f21101321000-genuine-paccar®-hvac-a-c-heater-control-assembly","title":"F21101321000 | Genuine Paccar® HVAC A\/C Heater Control Assembly","description":"\u003cp\u003e\u003cstrong\u003eDescription:\u003cbr\u003e\u003c\/strong\u003eAn HVAC A\/C Heater Control Assembly\u003cstrong\u003e F21101321000\u003c\/strong\u003e is the part of a vehicle’s climate control system that lets you control heating, air conditioning, and airflow inside the cabin. HVAC A\/C Heater Control Assembly For Kenworth T660, T180, T280, T380, K270, K370, C500.\u003cbr\u003e\u003cstrong\u003e\u003cbr\u003ePart Number\u003c\/strong\u003e: F21101321000\u003cbr\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003cspan\u003e: New\u003c\/span\u003e\u003cbr\u003e\u003cstrong\u003eManufacture\/Brand\u003c\/strong\u003e\u003cspan\u003e: Paccar\u003cbr\u003e\u003c\/span\u003e\u003cstrong data-end=\"176\" data-start=\"160\"\u003e\u003cspan\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003cstrong\u003eFits F21-1013-21-000 \u003c\/strong\u003eFor \u003cbr\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp\u003e-Kenworth trucks (PACCAR platform)\u003cbr\u003e\u003cstrong data-end=\"560\" data-start=\"519\"\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003e     \u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003e  -Kenworth T660\u003c\/span\u003e\u003c\/span\u003e \u003cbr\u003e\u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003e       -Kenworth T180\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003e       -Kenworth T280\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003e       -Kenworth T380\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003e       -Kenworth K270\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003e       -Kenworth K370\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003e       -Kenworth C500\u003c\/span\u003e\u003c\/span\u003e\u003cstrong data-end=\"876\" data-start=\"833\"\u003e\u003cspan class=\"hover:entity-accent entity-underline inline cursor-pointer align-baseline\"\u003e\u003cspan class=\"whitespace-normal\"\u003e\u003cbr\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/strong\u003e-Approx. model years: 2006–2023 \u003cbr\u003e\u003cspan data-state=\"closed\" class=\"\"\u003e\u003c\/span\u003e-Designed for day cab (front cab) configurations (NOT sleeper cabs)\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cul class=\"nav catalog\" id=\"catalogModels\"\u003e\u003c\/ul\u003e\n\u003cp data-end=\"353\" data-start=\"160\"\u003e\u003cstrong\u003ePurpose of using F21101321000:\u003c\/strong\u003e\u003cstrong\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp data-start=\"432\" data-end=\"476\"\u003e\u003cstrong\u003e1. Regulates cabin temperature precisely\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"477\" data-end=\"674\"\u003e\n\u003cli data-start=\"477\" data-end=\"528\"\u003e\n\u003cp data-start=\"479\" data-end=\"528\"\u003eAllows \u003cstrong data-start=\"486\" data-end=\"505\"\u003efine adjustment\u003c\/strong\u003e of heating and cooling\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"529\" data-end=\"566\"\u003e\n\u003cp data-start=\"531\" data-end=\"566\"\u003ePrevents overheating or overcooling\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"567\" data-end=\"674\"\u003e\n\u003cp data-start=\"569\" data-end=\"674\"\u003eIn automatic systems, it \u003cstrong data-start=\"594\" data-end=\"625\"\u003emaintains a set temperature\u003c\/strong\u003e by adjusting A\/C, heat, and fan speed on its own\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"676\" data-end=\"778\"\u003e\u003cstrong data-start=\"676\" data-end=\"695\"\u003eWhy it matters:\u003c\/strong\u003e Stable cabin temperature keeps the driver comfortable and focused over long hours.\u003c\/p\u003e\n\u003cp data-start=\"785\" data-end=\"825\"\u003e\u003cstrong\u003e2. Controls airflow and distribution\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"826\" data-end=\"963\"\u003e\n\u003cli data-start=\"826\" data-end=\"885\"\u003e\n\u003cp data-start=\"828\" data-end=\"885\"\u003eDirects air to \u003cstrong data-start=\"843\" data-end=\"885\"\u003eface, floor, defrost, or sleeper vents\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"886\" data-end=\"932\"\u003e\n\u003cp data-start=\"888\" data-end=\"932\"\u003eBalances airflow between \u003cstrong data-start=\"913\" data-end=\"932\"\u003ecab and sleeper\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"933\" data-end=\"963\"\u003e\n\u003cp data-start=\"935\" data-end=\"963\"\u003eEnsures even air circulation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"965\" data-end=\"1051\"\u003e\u003cstrong data-start=\"965\" data-end=\"984\"\u003eWhy it matters:\u003c\/strong\u003e Proper airflow avoids hot\/cold spots and improves overall comfort.\u003c\/p\u003e\n\u003cp data-start=\"1058\" data-end=\"1100\"\u003e\u003cstrong\u003e3. Manages defrost and defog functions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1101\" data-end=\"1227\"\u003e\n\u003cli data-start=\"1101\" data-end=\"1131\"\u003e\n\u003cp data-start=\"1103\" data-end=\"1131\"\u003eActivates windshield defrost\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1132\" data-end=\"1174\"\u003e\n\u003cp data-start=\"1134\" data-end=\"1174\"\u003eUses A\/C to remove moisture from the air\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1175\" data-end=\"1227\"\u003e\n\u003cp data-start=\"1177\" data-end=\"1227\"\u003eKeeps windows clear in rain, snow, or cold weather\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1229\" data-end=\"1318\"\u003e\u003cstrong data-start=\"1229\" data-end=\"1248\"\u003eWhy it matters:\u003c\/strong\u003e Clear visibility is a \u003cstrong data-start=\"1271\" data-end=\"1299\"\u003ecritical safety function\u003c\/strong\u003e, not just comfort.\u003c\/p\u003e\n\u003cp data-start=\"1325\" data-end=\"1367\"\u003e\u003cstrong\u003e4. Integrates multiple climate systems\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-start=\"1368\" data-end=\"1415\"\u003eIn modern trucks, the control panel can manage:\u003c\/p\u003e\n\u003cul data-start=\"1416\" data-end=\"1547\"\u003e\n\u003cli data-start=\"1416\" data-end=\"1435\"\u003e\n\u003cp data-start=\"1418\" data-end=\"1435\"\u003eEngine-driven A\/C\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1436\" data-end=\"1453\"\u003e\n\u003cp data-start=\"1438\" data-end=\"1453\"\u003eCab heater core\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1454\" data-end=\"1468\"\u003e\n\u003cp data-start=\"1456\" data-end=\"1468\"\u003eSleeper HVAC\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1469\" data-end=\"1518\"\u003e\n\u003cp data-start=\"1471\" data-end=\"1518\"\u003e\u003cstrong data-start=\"1471\" data-end=\"1492\"\u003eAuxiliary heaters\u003c\/strong\u003e (hydronic or air heaters)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1519\" data-end=\"1547\"\u003e\n\u003cp data-start=\"1521\" data-end=\"1547\"\u003eEngine-off climate systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1549\" data-end=\"1640\"\u003e\u003cstrong data-start=\"1549\" data-end=\"1568\"\u003eWhy it matters:\u003c\/strong\u003e One panel coordinates everything so systems don’t conflict or overload.\u003c\/p\u003e\n\u003cp data-start=\"1647\" data-end=\"1680\"\u003e\u003cstrong\u003e5. Improves energy efficiency\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1681\" data-end=\"1795\"\u003e\n\u003cli data-start=\"1681\" data-end=\"1720\"\u003e\n\u003cp data-start=\"1683\" data-end=\"1720\"\u003eReduces unnecessary A\/C or heater use\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1721\" data-end=\"1767\"\u003e\n\u003cp data-start=\"1723\" data-end=\"1767\"\u003eOptimizes fan speed and compressor operation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1768\" data-end=\"1795\"\u003e\n\u003cp data-start=\"1770\" data-end=\"1795\"\u003eHelps limit engine idling\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1797\" data-end=\"1870\"\u003e\u003cstrong data-start=\"1797\" data-end=\"1816\"\u003eWhy it matters:\u003c\/strong\u003e Saves fuel, reduces wear, and lowers operating costs.\u003c\/p\u003e\n\u003cp data-start=\"1877\" data-end=\"1920\"\u003e\u003cstrong\u003e6. Enhances driver safety and alertness\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1921\" data-end=\"2043\"\u003e\n\u003cli data-start=\"1921\" data-end=\"1962\"\u003e\n\u003cp data-start=\"1923\" data-end=\"1962\"\u003eComfortable temperature reduces fatigue\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1963\" data-end=\"1999\"\u003e\n\u003cp data-start=\"1965\" data-end=\"1999\"\u003ePrevents drowsiness caused by heat\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2000\" data-end=\"2043\"\u003e\n\u003cp data-start=\"2002\" data-end=\"2043\"\u003eMaintains concentration during long hauls\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2045\" data-end=\"2128\"\u003e\u003cstrong data-start=\"2045\" data-end=\"2064\"\u003eWhy it matters:\u003c\/strong\u003e Climate control directly affects driver performance and safety.\u003c\/p\u003e\n\u003cp data-start=\"2135\" data-end=\"2182\"\u003e\u003cstrong\u003e7. Provides system feedback and diagnostics\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"2183\" data-end=\"2292\"\u003e\n\u003cli data-start=\"2183\" data-end=\"2210\"\u003e\n\u003cp data-start=\"2185\" data-end=\"2210\"\u003eDisplays operating status\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2211\" data-end=\"2248\"\u003e\n\u003cp data-start=\"2213\" data-end=\"2248\"\u003eShows warning lights or fault codes\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"2249\" data-end=\"2292\"\u003e\n\u003cp data-start=\"2251\" data-end=\"2292\"\u003eHelps identify HVAC system problems early\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"2294\" data-end=\"2371\"\u003e\u003cstrong data-start=\"2294\" data-end=\"2313\"\u003eWhy it matters:\u003c\/strong\u003e Early detection prevents bigger, more expensive failures.\u003c\/p\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp data-end=\"353\" data-start=\"160\"\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003cstrong data-end=\"597\" data-start=\"585\"\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSigns of a Bad HVAC A\/C Heater Control Assembly F21101321000:\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ctable width=\"100%\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\n\u003cp data-start=\"207\" data-end=\"238\"\u003e\u003cstrong\u003e1. Temperature won’t change\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"239\" data-end=\"397\"\u003e\n\u003cli data-start=\"239\" data-end=\"275\"\u003e\n\u003cp data-start=\"241\" data-end=\"275\"\u003eStuck on \u003cstrong data-start=\"250\" data-end=\"275\"\u003efull hot or full cold\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"276\" data-end=\"397\"\u003e\n\u003cp data-start=\"278\" data-end=\"397\"\u003eTurning the knob or pressing buttons does nothing\u003cbr data-start=\"327\" data-end=\"330\"\u003e\u003cstrong data-start=\"330\" data-end=\"340\"\u003eCause:\u003c\/strong\u003e Failed internal switch, control module, or signal output\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"404\" data-end=\"436\"\u003e\u003cstrong\u003e2. A\/C or heat won’t turn on\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"437\" data-end=\"588\"\u003e\n\u003cli data-start=\"437\" data-end=\"464\"\u003e\n\u003cp data-start=\"439\" data-end=\"464\"\u003eCompressor doesn’t engage\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"465\" data-end=\"588\"\u003e\n\u003cp data-start=\"467\" data-end=\"588\"\u003eHeater doesn’t respond\u003cbr data-start=\"489\" data-end=\"492\"\u003e\u003cstrong data-start=\"492\" data-end=\"502\"\u003eCause:\u003c\/strong\u003e Panel not sending the “on” command, bad relay signal, or internal electronics failure\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"595\" data-end=\"631\"\u003e\u003cstrong\u003e3. Fan speed control not working\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"632\" data-end=\"744\"\u003e\n\u003cli data-start=\"632\" data-end=\"661\"\u003e\n\u003cp data-start=\"634\" data-end=\"661\"\u003eFan only works on one speed\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"662\" data-end=\"744\"\u003e\n\u003cp data-start=\"664\" data-end=\"744\"\u003eNo fan at all\u003cbr data-start=\"677\" data-end=\"680\"\u003e\u003cstrong data-start=\"680\" data-end=\"690\"\u003eCause:\u003c\/strong\u003e Faulty fan control circuit or panel interface failure\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"751\" data-end=\"788\"\u003e\u003cstrong\u003e4. Airflow direction won’t change\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"789\" data-end=\"893\"\u003e\n\u003cli data-start=\"789\" data-end=\"893\"\u003e\n\u003cp data-start=\"791\" data-end=\"893\"\u003eAir stuck on defrost, floor, or vents\u003cbr data-start=\"828\" data-end=\"831\"\u003e\u003cstrong data-start=\"831\" data-end=\"841\"\u003eCause:\u003c\/strong\u003e Panel not controlling blend\/door actuators properly\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"900\" data-end=\"921\"\u003e\u003cstrong\u003e5. Display issues\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"922\" data-end=\"1077\"\u003e\n\u003cli data-start=\"922\" data-end=\"936\"\u003e\n\u003cp data-start=\"924\" data-end=\"936\"\u003eBlank screen\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"937\" data-end=\"964\"\u003e\n\u003cp data-start=\"939\" data-end=\"964\"\u003eFlickering or dim display\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"965\" data-end=\"1077\"\u003e\n\u003cp data-start=\"967\" data-end=\"1077\"\u003eMissing segments or unreadable icons\u003cbr data-start=\"1003\" data-end=\"1006\"\u003e\u003cstrong data-start=\"1006\" data-end=\"1016\"\u003eCause:\u003c\/strong\u003e Power supply issue inside the panel or failing circuit board\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1084\" data-end=\"1120\"\u003e\u003cstrong\u003e6. Buttons or knobs unresponsive\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1121\" data-end=\"1255\"\u003e\n\u003cli data-start=\"1121\" data-end=\"1151\"\u003e\n\u003cp data-start=\"1123\" data-end=\"1151\"\u003eButtons must be pressed hard\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1152\" data-end=\"1255\"\u003e\n\u003cp data-start=\"1154\" data-end=\"1255\"\u003eKnobs spin freely or feel loose\u003cbr data-start=\"1185\" data-end=\"1188\"\u003e\u003cstrong data-start=\"1188\" data-end=\"1198\"\u003eCause:\u003c\/strong\u003e Worn contacts, broken potentiometers, or physical damage\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1262\" data-end=\"1291\"\u003e\u003cstrong\u003e7. Intermittent operation\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1292\" data-end=\"1431\"\u003e\n\u003cli data-start=\"1292\" data-end=\"1328\"\u003e\n\u003cp data-start=\"1294\" data-end=\"1328\"\u003eWorks sometimes, fails other times\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1329\" data-end=\"1431\"\u003e\n\u003cp data-start=\"1331\" data-end=\"1431\"\u003eChanges settings on its own\u003cbr data-start=\"1358\" data-end=\"1361\"\u003e\u003cstrong data-start=\"1361\" data-end=\"1371\"\u003eCause:\u003c\/strong\u003e Loose wiring, cracked solder joints, internal board failure\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1438\" data-end=\"1473\"\u003e\u003cstrong\u003e8. Defrost not working properly\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1474\" data-end=\"1582\"\u003e\n\u003cli data-start=\"1474\" data-end=\"1582\"\u003e\n\u003cp data-start=\"1476\" data-end=\"1582\"\u003eWindshield fogs up and won’t clear\u003cbr data-start=\"1510\" data-end=\"1513\"\u003e\u003cstrong data-start=\"1513\" data-end=\"1523\"\u003eCause:\u003c\/strong\u003e Panel failing to command defrost mode (major safety issue)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1589\" data-end=\"1625\"\u003e\u003cstrong\u003e9. Fault codes or warning lights\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1626\" data-end=\"1758\"\u003e\n\u003cli data-start=\"1626\" data-end=\"1654\"\u003e\n\u003cp data-start=\"1628\" data-end=\"1654\"\u003eHVAC error codes displayed\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1655\" data-end=\"1758\"\u003e\n\u003cp data-start=\"1657\" data-end=\"1758\"\u003eBlinking lights on the panel\u003cbr data-start=\"1685\" data-end=\"1688\"\u003e\u003cstrong data-start=\"1688\" data-end=\"1698\"\u003eCause:\u003c\/strong\u003e Communication failure between panel and HVAC control module\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"1765\" data-end=\"1807\"\u003e\u003cstrong\u003e10. No response from auxiliary systems\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-start=\"1808\" data-end=\"1969\"\u003e\n\u003cli data-start=\"1808\" data-end=\"1858\"\u003e\n\u003cp data-start=\"1810\" data-end=\"1858\"\u003eSleeper heater or hydronic heater won’t activate\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1859\" data-end=\"1969\"\u003e\n\u003cp data-start=\"1861\" data-end=\"1969\"\u003eEngine-off climate system not responding\u003cbr data-start=\"1901\" data-end=\"1904\"\u003e\u003cstrong data-start=\"1904\" data-end=\"1914\"\u003eCause:\u003c\/strong\u003e Panel not communicating with auxiliary HVAC components\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp data-end=\"476\" data-start=\"97\"\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003eAbout the Manufacturer – \u003c\/span\u003e\u003cspan style=\"font-size: 0.875rem;\"\u003ePaccar:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp data-end=\"381\" data-start=\"0\"\u003e\u003cstrong data-start=\"96\" data-end=\"110\"\u003ePACCAR Inc\u003c\/strong\u003e 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.\u003cbr\u003ePACCAR’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.\u003c\/p\u003e","brand":"Paccar®","offers":[{"title":"Default Title","offer_id":50682843529463,"sku":"F21101321000","price":729.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0895\/7080\/3959\/files\/photo_2026-04-16_02-14-15.jpg?v=1776295123","url":"https:\/\/forcetruckparts.com\/products\/f21101321000-genuine-paccar%c2%ae-hvac-a-c-heater-control-assembly","provider":"Force Truck Parts","version":"1.0","type":"link"}