{"product_id":"viscous-coupling-with-fan-21-5-mm-thread-gazelle-zmz-405-engine-oem-390994-1308010","title":"Viscous Coupling with Fan 21.5 mm Thread – GAZelle (ZMZ-405 Engine) – OEM 390994-1308010","description":"\u003cp data-start=\"382\" data-end=\"701\"\u003eThis viscous coupling with integrated fan is the OEM-specified unit 390994-1308010, designed for the GAZelle series equipped with the ZMZ-405 petrol engine. With a 21.5 mm threaded hub, it mounts directly to the factory water pump shaft, ensuring reliable engine cooling under varying load and temperature conditions.\u003c\/p\u003e\n\u003cp data-start=\"703\" data-end=\"1137\"\u003e\u003cstrong data-start=\"703\" data-end=\"749\"\u003eWhy choose this viscous coupling with fan?\u003c\/strong\u003e\u003cbr data-start=\"749\" data-end=\"752\"\u003eThis factory-style unit integrates a multi-blade cooling fan with a thermostatic viscous clutch, allowing the fan to engage only when extra airflow is required. This helps optimize fuel efficiency, reduce engine drag, and maintain stable operating temperatures. Built to OEM dimensions, it matches the original fan shroud and radiator layout of GAZelle vehicles with ZMZ-405 engines.\u003c\/p\u003e\n\u003cp data-start=\"1139\" data-end=\"1489\"\u003e\u003cstrong data-start=\"1139\" data-end=\"1161\"\u003eTechnical details:\u003c\/strong\u003e\u003cbr data-start=\"1161\" data-end=\"1164\"\u003eThread size: 21.5 mm internal (mounting to water pump shaft)\u003cbr data-start=\"1224\" data-end=\"1227\"\u003eApplication: ZMZ-405 petrol engine (GAZelle)\u003cbr data-start=\"1271\" data-end=\"1274\"\u003eFunction: Temperature-activated viscous clutch with multi-blade cooling fan\u003cbr data-start=\"1349\" data-end=\"1352\"\u003eConstruction: Composite\/plastic fan mounted on steel viscous hub\u003cbr data-start=\"1416\" data-end=\"1419\"\u003eOEM reference: 390994-1308010\u003cbr data-start=\"1448\" data-end=\"1451\"\u003eCondition: New, OEM-spec replacement\u003c\/p\u003e\n\u003cp data-start=\"1491\" data-end=\"1545\"\u003e\u003cstrong data-start=\"1491\" data-end=\"1513\"\u003eCompatible models:\u003c\/strong\u003e\u003cbr data-start=\"1513\" data-end=\"1516\"\u003eGAZelle with ZMZ-405 engine\u003c\/p\u003e\n\u003cp data-start=\"1547\" data-end=\"1897\"\u003e\u003cstrong data-start=\"1547\" data-end=\"1569\"\u003eInstallation tips:\u003c\/strong\u003e\u003cbr data-start=\"1569\" data-end=\"1572\"\u003eThread the fan coupling onto the water pump shaft, respecting the reverse thread direction used on these fittings. Use the correct fan clutch spanner for installation. Always clean the threads before mounting and check radiator clearance after tightening. Do not overtighten, as this may damage the water pump shaft or hub.\u003c\/p\u003e\n\u003cp data-start=\"1899\" data-end=\"2145\"\u003e\u003cstrong data-start=\"1899\" data-end=\"1919\"\u003eWhen to replace?\u003c\/strong\u003e\u003cbr data-start=\"1919\" data-end=\"1922\"\u003eReplace if the engine overheats at idle, if the fan spins freely when hot, or if abnormal fan noise occurs. The viscous clutch typically requires replacement after about 100,000 km, or earlier under heavy-duty conditions.\u003c\/p\u003e\n\u003cp data-start=\"2147\" data-end=\"2267\"\u003e\u003cstrong data-start=\"2147\" data-end=\"2175\"\u003eQuestions about fitment?\u003c\/strong\u003e\u003cbr data-start=\"2175\" data-end=\"2178\"\u003eNot sure if this part fits your vehicle? Feel free to contact us — we’re happy to help.\u003c\/p\u003e","brand":"UAZPARTS.COM","offers":[{"title":"Default Title","offer_id":51288204247383,"sku":"390994-1308010 DC","price":90.87,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0925\/4859\/6055\/files\/Viscous-Coupling-with-Fan-21_5-mm-Thread-GAZelle-ZMZ-405-Engine-OEM-390994-1308010-uaz-spare-parts-1.jpg?v=1777916736","url":"https:\/\/www.uazparts.com\/products\/viscous-coupling-with-fan-21-5-mm-thread-gazelle-zmz-405-engine-oem-390994-1308010","provider":"UAZPARTS.COM","version":"1.0","type":"link"}