{"product_id":"vw-sealing-cap-coolant-tank-skvk-1960003","title":"STARK SKVK-1960003 Expansion tank cap VW","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003eSTARK Expansion tank cap (SKVK-1960003)\u003c\/strong\u003e is an original-equipment-quality pressure-regulating cooling system component engineered by Stark Professional Line. Positioned securely on top of the coolant expansion reservoir, its primary operational function is to seal the cooling loop and maintain a calibrated static pressure of approximately 1.4 to 1.5 bar within the system. Raising the internal pressure elevates the boiling point of the water-antifreeze mixture well past 100°C, allowing the engine to run at high thermal efficiency without localized coolant boiling. The cap houses a twin-valve safety mechanism: a pressure relief valve that releases dangerous pressure spikes to prevent cooling hoses or the radiator from bursting, and a vacuum relief valve that opens as the engine cools to prevent atmospheric pressure from collapsing the hoses. Over time, plastic thermal breakdown, scale build-up, or a fatigued internal spring will cause the valves to stick, resulting in either cooling loop over-pressurization (blown hoses and cracked tanks) or pressure bleed-off (causing premature engine boiling and fluid loss).\u003c\/p\u003e\n\n\u003ch3\u003eProduct Specifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e STARK Professional Line\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eItem Number:\u003c\/strong\u003e SKVK-1960003\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEAN Number:\u003c\/strong\u003e 4059191602179\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProduct Condition:\u003c\/strong\u003e New\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eComponent Classification:\u003c\/strong\u003e Engine Cooling Loop Safety Pressure Cap \/ Radiator Reservoir Cap\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e High-grade composite plastic \/ polymer\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColour:\u003c\/strong\u003e Iconic VAG Blue\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMounting Type:\u003c\/strong\u003e Threaded Screw Connection\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eThread Type:\u003c\/strong\u003e External Thread with an integrated elastomeric sealing ring\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOpening Pressure [bar]:\u003c\/strong\u003e 1.4 - 1.5 (Calibrated to VAG factory cooling loop parameters)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eVehicle Compatibility\u003c\/h3\u003e\n\u003cp\u003eThis classic blue external-thread pressure cap profile is precision-engineered to service the cooling reservoirs of highly popular front-wheel-drive (FWD) and commercial Volkswagen Audi Group (VAG) platforms stretching from the late 1980s through the late 2000s:\u003c\/p\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"background-color: #f2f2f2;\"\u003e\n      \u003cth\u003eCar Model \/ Platform\u003c\/th\u003e\n      \u003cth\u003eCompatible Engine Layouts \u0026amp; Codes\u003c\/th\u003e\n      \u003cth\u003eEngine Displacement Range\u003c\/th\u003e\n      \u003cth\u003eYear of Manufacture\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eVW Golf Mk2 (19E, 1G1) \/ Golf Mk3 (1H1) \/ Golf Mk4 Cabriolet\u003c\/td\u003e\n      \u003ctd\u003e1.4 \/ 1.6 \/ 1.8 \/ 2.0 \/ 1.9 D \/ 1.9 TD \/ 1.9 TDI \u003cbr\u003e\u003cem\u003e(Classic platforms from standard carburetted lines to early TDIs)\u003c\/em\u003e\n\u003c\/td\u003e\n      \u003ctd\u003e1272 - 1984 cc\u003c\/td\u003e\n      \u003ctd\u003e1988 - 2002\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eVW Transporter T4 Van \/ Bus \/ Platform (70X, 7D)\u003c\/td\u003e\n      \u003ctd\u003e1.9 TD \/ 2.0 \/ 2.4 D \/ 2.5 \/ 2.5 TDI commercial configurations\u003c\/td\u003e\n      \u003ctd\u003e1896 - 2461 cc\u003c\/td\u003e\n      \u003ctd\u003e1990 - 2003\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eVW Polo Mk3 (6N1, 6N2) \/ Polo 86C Coupe \/ Caddy Mk2 Van\u003c\/td\u003e\n      \u003ctd\u003e1.0 \/ 1.3 \/ 1.4 \/ 1.6 \/ 1.9 SDI \/ 1.9 TDI variants\u003c\/td\u003e\n      \u003ctd\u003e999 - 1896 cc\u003c\/td\u003e\n      \u003ctd\u003e1981 - 2002\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSEAT Ibiza Mk2 \u0026amp; Mk3 (6K1, 6L1) \/ Cordoba \/ Arosa (6H)\u003c\/td\u003e\n      \u003ctd\u003e1.0 \/ 1.4 \/ 1.4 16V \/ 1.6 \/ 1.9 TDI supermini variants\u003c\/td\u003e\n      \u003ctd\u003e999 - 1896 cc\u003c\/td\u003e\n      \u003ctd\u003e1993 - 2009\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eVW Passat B3 \u0026amp; B4 (3A2, 35I, 3A5) \/ Corrado (53I)\u003c\/td\u003e\n      \u003ctd\u003e1.6 \/ 1.8 \/ 2.0 \/ 1.9 TD \/ 2.8 VR6 longitudinal \u0026amp; transverse loops\u003c\/td\u003e\n      \u003ctd\u003e1595 - 2792 cc\u003c\/td\u003e\n      \u003ctd\u003e1988 - 1997\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd\u003eSEAT Alhambra Mk1 (7M8, 7M9, 7M7)\u003c\/td\u003e\n      \u003ctd\u003e1.8 T 20V \/ 2.0 Petrol \u0026amp; 1.9 TDI MPV engine bays\u003c\/td\u003e\n      \u003ctd\u003e1781 - 1984 cc\u003c\/td\u003e\n      \u003ctd\u003e1996 - 2010\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cblockquote\u003e⚠️ \u003cstrong\u003eSafety, Seal Check \u0026amp; System Bleeding Warning:\u003c\/strong\u003e **NEVER attempt to unscrew the expansion tank cap while the engine is hot or running.** The cooling system is highly pressurized at operating temperature; opening the cap prematurely will induce instantaneous flashing of the coolant into steam, causing explosive boiling that can inflict severe facial and skin burns. Always allow the engine to cool down completely for at least one hour before servicing. When installing the new cap, inspect the internal sealing lip of the plastic reservoir tank for cracks or deformation, as minor imperfections will cause pressure leaks even with a new cap. After replacement, run the engine to operating temperature with your cabin heater set to high to ensure any trapped air bubbles bleed out of the cooling jacket automatically.\u003c\/blockquote\u003e\n\n\u003ch3\u003eOriginal Equipment Manufacturer (OEM) Reference Numbers\u003c\/h3\u003e\n\u003cp\u003eThis replacement pressure expansion cap corresponds directly with, or acts as a factory-correct swap for, the following original factory catalogue codes and premium aftermarket entries:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVAG (VW \/ AUDI \/ SEAT \/ SKODA \/ PORSCHE):\u003c\/strong\u003e 1H0121321C, 1H0 121 321C, 357121321C, 357 121 321C, 357121321A, 357 121 321A, 1H0121321A, 1H0 121 321A, 357121321, 357 121 321, 1H0121321B, 1H0 121 321B\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRIDEX (Interchange Reference):\u003c\/strong\u003e 56V0004\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFEBI BILSTEIN (Interchange Reference):\u003c\/strong\u003e 02269, 2269, 105933\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eGATES (Interchange Reference):\u003c\/strong\u003e RC228\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMEYLE (Interchange Reference):\u003c\/strong\u003e 100 238 0002, 1002380002\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTOPRAN (Interchange Reference):\u003c\/strong\u003e 103 451, 103451\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"stark","offers":[{"title":"Default Title","offer_id":57537978368383,"sku":"skvk-1960003","price":7.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1005\/7252\/9023\/files\/preview_c3d7d347-fb05-4669-82f0-13b4e143c43b.jpg?v=1778859335","url":"https:\/\/klassik357.eu\/products\/vw-sealing-cap-coolant-tank-skvk-1960003","provider":"Klassik357 - Classic and retro car parts","version":"1.0","type":"link"}