{"product_id":"premium-coolant-expansion-tank-radiator-cap-for-vw-passat-jetta-golf-tiguan-oem-3b0121321-3c0121321","title":"Premium Coolant Expansion Tank Radiator Cap for VW Passat Jetta Golf Tiguan | OEM 3B0121321 3C0121321","description":"\u003cp class=\"ng-star-inserted\"\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003eThe $15 Fix That Could Save Your Engine from Overheating!\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003eAre you constantly having to top off your engine coolant? Do you notice a crusty, white or pink residue building up around the neck of your coolant reservoir? If there are no visible puddles under your car, your coolant expansion tank cap is likely the culprit.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003cspan\u003e\u003cspan class=\"ng-star-inserted\"\u003eOver the years, the internal spring-loaded pressure relief valve and rubber seals inside the factory cap wear out. When this happens, vital coolant evaporates as steam and escapes the system, leading to dangerous overheating. Our \u003c\/span\u003e\u003cspan class=\"ng-star-inserted\"\u003eis engineered to exact factory OEM specifications, ensuring your cooling system maintains the perfect pressure to prevent boiling and protect your engine.\u003c\/span\u003e\u003c\/span\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003ePremium Coolant Expansion Tank Cap\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003eKey Features \u0026amp; Benefits:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"ng-star-inserted\"\u003e\n\u003cli class=\"ng-star-inserted\"\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003e⚙️ Exact OEM Fitment:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e\u003cspan class=\"ng-star-inserted\"\u003e Designed as a direct drop-in replacement for factory OE part numbers \u003c\/span\u003e\u003cspan class=\"ng-star-inserted\"\u003eand \u003c\/span\u003e\u003c\/span\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003e3B0121321\u003c\/span\u003e\u003c\/strong\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003e3C0121321\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"ng-star-inserted\"\u003e. Screws on securely with a factory-tight seal.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003e🌡️ Calibrated Pressure Control:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cspan\u003e \u003c\/span\u003eBuilt with a highly accurate internal pressure valve to maintain optimal boiling point control, ensuring your engine runs safely at normal operating temperatures.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003e🛡️ Upgraded O-Ring Seal:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cspan\u003e \u003c\/span\u003eFeatures a heavy-duty, temperature-resistant silicone O-ring to completely lock in coolant and prevent pressure loss.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003e🚗 Cost-Effective Preventative Maintenance:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cspan\u003e \u003c\/span\u003eBefore spending a fortune on diagnosing water pumps or radiators, replace your old cap. It’s the cheapest, easiest, and most common fix for mysterious coolant loss.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003eProduct Specifications:\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"ng-star-inserted\"\u003e\n\u003cli class=\"ng-star-inserted\"\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003ePart Type:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cspan\u003e \u003c\/span\u003eEngine Coolant Reservoir \/ Expansion Tank Cap\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003eMaterial:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cspan\u003e \u003c\/span\u003eHigh-Temperature Automotive Plastic \u0026amp; Rubber\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003eReference OE\/OEM Numbers:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cspan\u003e \u003c\/span\u003e3B0121321, 3C0121321, 3B0 121 321, 3C0 121 321\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003eBroad Vehicle Compatibility (Fitment):\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul class=\"ng-star-inserted\"\u003e\n\u003cli class=\"ng-star-inserted\"\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003eVolkswagen:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cspan\u003e \u003c\/span\u003ePassat (B5\/B6\/B7), Jetta (MK4\/MK5\/MK6), Golf \/ GTI (MK4\/MK5\/MK6), Tiguan (2009-2017), Touran, Beetle, CC, Eos, Scirocco.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003eAudi:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cspan\u003e \u003c\/span\u003eA3 (8P), A4 (B6\/B7\/B8), A6 (C5\/C6), Q5, TT.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003eSkoda \/ SEAT:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cspan\u003e \u003c\/span\u003eOctavia, Superb, Leon, Alhambra.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli class=\"ng-star-inserted\"\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003e(Note: This is one of the most widely used caps in the VAG lineup. Please visually match your original cap and verify the OE number before purchasing).\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003e💡 Mechanic’s Pro Tip:\u003c\/span\u003e\u003c\/strong\u003e\u003cbr class=\"ng-star-inserted\"\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003eNEVER remove the coolant cap when the engine is hot!\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cspan\u003e \u003c\/span\u003eThe system is highly pressurized and can cause severe burns. Wait for the engine to cool completely. When twisting the new cap on, make sure you tighten it firmly until you hear or feel it \"click\" or stop completely—this indicates it has sealed!\u003c\/span\u003e\u003c\/p\u003e","brand":"vwpartly","offers":[{"title":"Default Title","offer_id":52218260979995,"sku":null,"price":11.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1019\/5972\/9435\/files\/3B01213213C0121321_1_e4953768-e432-42a2-ad00-edb0efe0de67.png?v=1778942222","url":"https:\/\/vwpartly.com\/products\/premium-coolant-expansion-tank-radiator-cap-for-vw-passat-jetta-golf-tiguan-oem-3b0121321-3c0121321","provider":"VW Partly Auto Parts","version":"1.0","type":"link"}