{"product_id":"engine-block-heater-for-jeep-grand-cherokee-1993-2004-4-0l","title":"Engine Block Heater for Jeep Grand Cherokee (1993-2004) 4.0L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eCold-Start Immersion Engine Block Heater for 1993-2004 Jeep Grand Cherokee (ZJ \/ WJ)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The freeze plug engine block heater preheats engine coolant directly within the block casting on the 1993-2004 Grand Cherokee to eliminate cold-start friction wear and ensure rapid ignition in sub-zero temperatures.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Jeep Grand Cherokee Cold-Start Vulnerability\u003c\/h3\u003e\n\u003cp\u003eThe heavy cast-iron block and cylinder head of the \u003cstrong\u003eAMC 242 4.0L\u003c\/strong\u003e inline-six carry massive thermal mass. During sub-freezing cold starts, thickened engine oil experiences boundary lubrication failure, delaying hydraulic pressure delivery to the flat-tappet camshaft and valvetrain. Prolonged cranking in frigid conditions causes severe fuel enrichment washdown on the cylinder walls, accelerating piston ring degradation and draining battery reserve capacity.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eManufactured by Zerostart under part number \u003cstrong\u003e3100072\u003c\/strong\u003e, this 600-watt, 120-volt immersion heater installs directly into a factory 2-inch core freeze plug opening. Submerged straight into the cooling jacket, it transfers thermal energy conductively across the cylinders and engine oil passages. Pre-warming the block ensures instant oil pressure on startup, minimizes cylinder bore wear, reduces starter motor load, and delivers rapid cab defrosting.\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;\"\u003e1993-2004 Jeep Grand 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;\"\u003e4.0L Inline-6 (AMC 242) \/ \u003cstrong\u003eZJ\u003c\/strong\u003e \u0026amp; \u003cstrong\u003eWJ\u003c\/strong\u003e\n\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;\"\u003e185-195 hp \/ 220-230 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 \u003cstrong\u003e3100072\u003c\/strong\u003e (Fits 2\" 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\u003e1993-1998 Jeep Grand Cherokee (\u003cstrong\u003eZJ\u003c\/strong\u003e) with 4.0L I6 Gas Engine\u003c\/li\u003e\n  \u003cli\u003e1999-2004 Jeep Grand Cherokee (\u003cstrong\u003eWJ\u003c\/strong\u003e) with 4.0L I6 Gas Engine\u003c\/li\u003e\n  \u003cli\u003eNote: Excludes all 2.5L I4, 3.7L V6, 4.7L V8, 5.2L V8, and 5.9L V8 applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the ZJ and WJ Grand Cherokee?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 1993-2004 Jeep Grand Cherokee equipped with the \u003cstrong\u003eAMC 242 4.0L\u003c\/strong\u003e engine.\u003c\/p\u003e\n\n\u003ch4\u003eDoes installation require draining the cooling system?\u003c\/h4\u003e\n\u003cp\u003eYes, the cooling system must be drained prior to removing the 2-inch freeze plug and refilled and thoroughly bled following element installation.\u003c\/p\u003e\n\n\u003ch3\u003eThe Jeep Off-Road Reliability Standard\u003c\/h3\u003e\n\u003cp\u003eThe 4.0L inline-six is renowned for trail durability, but extreme cold creates severe internal mechanical friction. Installing a dedicated block heater mitigates thermal shock and guarantees starter reliability through the most severe winter conditions.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67539504988408,"sku":"DS-ECY68SK2A","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-grand-cherokee-1993-2004-4-0l-1.jpg?v=1790650335","url":"https:\/\/performancechiptuning.com\/fr\/products\/engine-block-heater-for-jeep-grand-cherokee-1993-2004-4-0l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}