{"product_id":"premium-coolant-expansion-tank-reservoir-cap-for-vw-golf-tiguan-jetta-skoda-oem-2qd121321a-5qd121321","title":"Premium Coolant Expansion Tank Reservoir Cap for VW Golf Tiguan Jetta Skoda | OEM 2QD121321A 5QD121321","description":"\u003cp class=\"ng-star-inserted\"\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003eStop Mysterious Coolant Leaks and Overheating with OEM-Grade Pressure Control!\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003eAre you constantly topping off your engine coolant, but can't find any visible puddles under your car? Do you see a white or pink crusty residue building up around the neck of your coolant reservoir? The culprit is almost always a failing expansion tank cap.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"ng-star-inserted\"\u003e\u003cspan\u003e\u003cspan class=\"ng-star-inserted\"\u003eThe coolant cap isn't just a lid—it contains a critical spring-loaded pressure relief valve. When this valve weakens over time, it allows vital coolant to boil off and escape as steam. Our \u003c\/span\u003e\u003cspan class=\"ng-star-inserted\"\u003eis engineered to exact factory specifications, maintaining the precise system pressure required to prevent your engine from boiling over and protecting your hoses from bursting.\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, tight-sealing replacement for factory OE part numbers \u003c\/span\u003e\u003cspan class=\"ng-star-inserted\"\u003eand \u003c\/span\u003e\u003cspan class=\"ng-star-inserted\"\u003e.\u003c\/span\u003e\u003c\/span\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003e2QD121321A\u003c\/span\u003e\u003c\/strong\u003e\u003cstrong class=\"ng-star-inserted\"\u003e\u003cspan class=\"ng-star-inserted\"\u003e5QD121321\u003c\/span\u003e\u003c\/strong\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🌡️ Precise Pressure Relief:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cspan\u003e \u003c\/span\u003eCalibrated to the exact OEM pressure rating to maintain optimal boiling point control, ensuring your MQB engine runs at the perfect temperature.\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, heat-resistant silicone\/Viton inner O-ring to completely lock in coolant and prevent vapor evaporation.\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🚗 The First Diagnostic Step:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cspan\u003e \u003c\/span\u003eBefore spending hundreds on a radiator or water pump replacement, replacing a faulty cap is the cheapest and most effective way to cure 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 Cap \/ Radiator Overflow 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 Polymer\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\u003e2QD121321A, 5QD121321, 2QD-121-321-A, 5QD-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 (MQB Platform):\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cspan\u003e \u003c\/span\u003eGolf \/ GTI \/ R (MK7\/MK8), Tiguan (MK2), Jetta (MK7), Passat (B8), Arteon, Atlas, Taos.\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:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan class=\"ng-star-inserted\"\u003e\u003cspan\u003e \u003c\/span\u003eOctavia (MK3\/MK4), Superb, Kodiaq, Karoq.\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\/S3 (8V\/8Y), Q3, 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\u003cspan class=\"ng-star-inserted\"\u003e(Note: Please verify your original cap visually and match the OE numbers 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 open 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 until the engine is completely cold. When installing your new cap, make sure to tighten it until you hear and feel it \"click\" into its final locked position!\u003c\/span\u003e\u003c\/p\u003e","brand":"vwpartly","offers":[{"title":"Default Title","offer_id":52218242695451,"sku":null,"price":12.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1019\/5972\/9435\/files\/2QD121321A5QD121321_1.png?v=1778941853","url":"https:\/\/vwpartly.com\/products\/premium-coolant-expansion-tank-reservoir-cap-for-vw-golf-tiguan-jetta-skoda-oem-2qd121321a-5qd121321","provider":"VW Partly Auto Parts","version":"1.0","type":"link"}