{"product_id":"gm-a-c-thermal-limiter-6551258-6551259-nos-boxed","title":"GM A\/C Thermal Limiter 6551258 \/ 6551259 (NOS, Boxed)","description":"\u003cp\u003e\u003cspan\u003eGenuine GM‑spec \u003cstrong\u003eAir Conditioning Thermal Limiter\u003c\/strong\u003e, correct for 1960s–1980s vehicles equipped with the Frigidaire A6 compressor. This limiter protects the compressor clutch circuit from overheating and is essential for OEM‑correct A\/C restoration.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA thermal limiter protects the A\/C compressor circuit by \u003cstrong\u003eopening the circuit if temperatures exceed safe limits\u003c\/strong\u003e, preventing harness melt or compressor damage.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eKey Specs\u003c\/h3\u003e\n\u003cul role=\"list\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eType:\u003c\/strong\u003e GM A\/C Thermal Limiter\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eComponent Marking:\u003c\/strong\u003e 6551259\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eBox Marking:\u003c\/strong\u003e 6551258\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eVoltage:\u003c\/strong\u003e 12V system\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eTerminals:\u003c\/strong\u003e 3‑prong configuration\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFunction:\u003c\/strong\u003e Over‑temperature protection for compressor clutch circuit\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eEra:\u003c\/strong\u003e 1960s–1980s GM factory A\/C systems\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eBrand:\u003c\/strong\u003e Likely Buss \/ GM supplier (common for these parts)\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eThis is a \u003cstrong\u003epatented limiter assembly\u003c\/strong\u003e, used in millions of GM vehicles equipped with the A6 compressor.\u003c\/span\u003e\u003c\/p\u003e\n\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003ch2\u003e🚗 \u003cstrong\u003e\u003cspan role=\"button\" data-url=\"ca:\/\/s?q=List_GM_applications_for_thermal_limiters\" tabindex=\"0\"\u003eCorrect Applications\u003c\/span\u003e\u003c\/strong\u003e\n\u003c\/h2\u003e\n\u003cp\u003e\u003cspan\u003eThermal limiters were used across nearly all GM divisions:\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eGM Cars\u003c\/h3\u003e\n\u003cul role=\"list\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eChevrolet: Chevelle, Nova, Camaro, Impala, Caprice\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePontiac: Firebird, LeMans, Grand Prix\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBuick: Skylark, Riviera, Electra\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eOldsmobile: Cutlass, Delta 88, 98\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCadillac: DeVille, Fleetwood\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eGM Trucks\u003c\/h3\u003e\n\u003cul role=\"list\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eC\/K pickups\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eSuburban\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBlazer\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eGMC Sierra \/ Jimmy\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhy They’re Important\u003c\/h3\u003e\n\u003cul role=\"list\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRequired for \u003cstrong\u003econcours‑level restorations\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePrevents compressor clutch harness failures\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eOften missing or bypassed on old vehicles\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eNOS units are increasingly rare\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e • GM‑spec thermal limiter assembly • Part numbers: 6551258 (box) \/ 6551259 (unit) • 3‑terminal design • Fits GM cars \u0026amp; trucks with A6 compressor • NOS condition with original packaging\u003c\/span\u003e\u003c\/p\u003e","brand":"CorvairFarmer","offers":[{"title":"Default Title","offer_id":49059772596475,"sku":null,"price":39.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0659\/3740\/8251\/files\/aa_86485beb-4efb-48b0-b012-d39760743eee.jpg?v=1783623511","url":"https:\/\/corvairfarmer.com\/products\/gm-a-c-thermal-limiter-6551258-6551259-nos-boxed","provider":"CorvairFarmer","version":"1.0","type":"link"}