{"product_id":"engine-block-heater-for-jeep-cherokee-1987-2001-4-0l","title":"Engine Block Heater for Jeep Cherokee (1987-2001) 4.0L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eCold-Weather Freeze Plug Engine Block Heater for 1987-2001 Jeep Cherokee (XJ)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Zerostart Engine Block Heater warms engine coolant directly inside the block of the 1987-2001 Jeep Cherokee to eliminate dry cold-starts, reduce starter draw, and deliver rapid cabin heat in sub-zero environments.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Jeep Cherokee Cold-Start Vulnerability\u003c\/h3\u003e\n\u003cp\u003eThe cast-iron \u003cstrong\u003eAMC 242\u003c\/strong\u003e 4.0L inline-six possesses substantial thermal mass. During sub-zero winter temperatures, thick 10W-30 engine oil resists rapid hydraulic flow to critical top-end components, including the flat-tappet camshaft, lifters, and pushrods. This cold-start boundary friction compounds starter motor load, drains factory battery reserve, and keeps the engine in rich, inefficient open-loop fueling far longer than necessary, accelerating internal cylinder bore wear.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered by Zerostart\/Temro under part number \u003cstrong\u003e3100072\u003c\/strong\u003e, this 600-watt, 120-volt immersion heater integrates straight into the cooling jacket via a standard 2-inch freeze (core) plug port. By submerging the heating element directly into engine coolant, natural convection circulates heated fluid through the entire cast-iron cylinder block and cylinder head. The package includes a weather-sealed, detachable power cord, providing consistent heat soak down to -40°F to guarantee instant turnover and lower cold-start tailpipe emissions.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e1987-2001 Jeep Cherokee\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eAMC 242 4.0L I6 \/ XJ\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e177-190 hp \/ 220-225 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eZerostart 3100072 (2-Inch Core Plug)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1987-2001 Jeep Cherokee (XJ) with 4.0L Inline 6-Cylinder Gas Engine\u003c\/li\u003e\n  \u003cli\u003eNote: Does not fit 2.5L 4-cylinder, 2.8L V6, or diesel variants.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the XJ Cherokee?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 1987-2001 Jeep Cherokee equipped with the AMC 242 4.0L engine.\u003c\/p\u003e\n\n\u003ch4\u003eWhich engine port is used for installation?\u003c\/h4\u003e\n\u003cp\u003eIt presses directly into a 2-inch engine block freeze plug port; drain coolant completely before driving out the factory core plug and installing the unit.\u003c\/p\u003e\n\n\u003ch3\u003eThe Jeep Durability Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered for brutal winter duty cycles and extreme overland cold, pre-heating your iron 4.0L preserves oil film strength, protects valvetrain metallurgy, and ensures your trail rig fires on the first turn of the key.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67539500171512,"sku":"DS-EIAI0LI55","price":64.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/engine-block-heater-for-jeep-cherokee-1987-2001-4-0l-1.jpg?v=1790650304","url":"https:\/\/performancechiptuning.com\/fr\/products\/engine-block-heater-for-jeep-cherokee-1987-2001-4-0l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}