{"product_id":"3mirrors-rear-a-c-block-off-kit-for-2014-2019-chevy-gmc-cadillac-suvs-hnbr-washers-stainless-hardware","title":"3mirrors Rear A\/C Block-Off Kit for 2014–2019 Chevy\/GMC\/Cadillac SUVs — HNBR Washers \u0026 Stainless Hardware","description":"\u003cp\u003e\u003cstrong\u003e3mirrors Rear AC Block Off Kit is a complete, OEM-style sealing kit that isolates and caps the rear air-conditioning lines on select 2014–2019 Chevrolet, GMC and Cadillac full-size SUVs without modifying the front system.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eWhen the rear HVAC components fail or are removed, refrigerant loss and unnecessary repair costs can follow if the rear lines remain open. This kit provides a straightforward, durable way to cap the rear A\/C lines so the front system continues to operate normally. Built-to-fit hardware, corrosion-resistant fasteners and high-performance HNBR sealing washers make this kit suitable for use in the engine bay and under-hood environments common to Suburban, Yukon, Tahoe and Escalade platforms.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this kit stop refrigerant loss while keeping the front A\/C functional?\u003c\/h3\u003e\n\n\u003cp\u003eBy replacing the rear line connection with an OE-style block-off assembly, the kit closes the circuit to the rear evaporator without altering or disconnecting the front air conditioning lines. That preserves the front loop and prevents refrigerant escape. Installation is reversible if the rear system is restored later.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eCaps the rear line connection point to seal the system.\u003c\/li\u003e\n  \u003cli\u003eUses HNBR washers for long-term leak resistance.\u003c\/li\u003e\n  \u003cli\u003eNo changes required to front A\/C plumbing or components.\u003c\/li\u003e\n  \u003cli\u003eRemovable hardware allows future reinstallation of rear components.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and parts are included for durability and fit?\u003c\/h3\u003e\n\n\u003cp\u003eThe kit includes stainless steel fasteners, CNC-machined aluminum fittings and nitrile-hydrogenated butadiene (HNBR) sealing washers engineered for automotive cooling systems. These choices resist corrosion, tolerate under-hood heat, and maintain sealing performance better than standard rubber washers.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003e2x M8 flange nuts and 2x hex head bolts in 304 stainless steel.\u003c\/li\u003e\n  \u003cli\u003e2x precision-machined aluminum block-off fittings.\u003c\/li\u003e\n  \u003cli\u003e2x German-made HNBR washers designed for refrigerant applications.\u003c\/li\u003e\n  \u003cli\u003ePrinted instruction sheet included for installation guidance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow difficult is installation and what tools are needed?\u003c\/h3\u003e\n\n\u003cp\u003eDesigned for technicians and experienced DIYers, the kit installs where the rear A\/C lines join the vehicle. No special modifications are required; standard hand tools handle the bolts and nuts. The package supplies instructions to walk you through the process step-by-step.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eTypical installation time: short — a competent technician can complete it quickly.\u003c\/li\u003e\n  \u003cli\u003eHand tools required: ratchet, appropriate sockets\/wrenches, torque wrench recommended.\u003c\/li\u003e\n  \u003cli\u003eInstructions included in the package and downloadable on the product page.\u003c\/li\u003e\n  \u003cli\u003eReversible installation allows future restoration of rear HVAC components.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich vehicle models and years is this compatible with?\u003c\/h3\u003e\n\n\u003cp\u003eThis block off kit was engineered to fit the rear A\/C line connections used on many 2014–2019 GM full-size SUVs. Verify fitment against vehicle specifications before purchasing, and consult the included guide for model-specific notes.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eCompatible with 2014–2019 Chevrolet Suburban and Tahoe models.\u003c\/li\u003e\n  \u003cli\u003eCompatible with 2014–2019 GMC Suburban 1500\/2500 and Yukon Denali XL.\u003c\/li\u003e\n  \u003cli\u003eCompatible with select 2014–2019 Cadillac Escalade rear A\/C setups.\u003c\/li\u003e\n  \u003cli\u003eCheck vehicle fit notes and photos in the listing before installation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This 3mirrors Rear AC Block Off Kit is intended for owners, fleet managers and technicians who need a reliable, OEM-style solution to isolate a failed or removed rear air-conditioning circuit on compatible GM SUVs. It’s a practical choice when you want to keep the front A\/C operational, avoid unnecessary evaporator replacements, or prepare a vehicle for rear HVAC removal with a durable, serviceable seal.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this kit affect the front air conditioning?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No — it seals the rear lines only, leaving the front A\/C loop intact and operational.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are replacement washers included and what are they made of?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes — the kit includes HNBR washers, a heat- and oil-resistant material made for HVAC sealing.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"3mirrors","offers":[{"title":"Default Title","offer_id":48084448280734,"sku":"B0BZVZ3D79","price":33.47,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/3mirrors-front-packaging-view.jpg?v=1785855670","url":"https:\/\/northtrailauto.ca\/products\/3mirrors-rear-a-c-block-off-kit-for-2014-2019-chevy-gmc-cadillac-suvs-hnbr-washers-stainless-hardware","provider":"North Trail Auto","version":"1.0","type":"link"}