{"product_id":"mercedes-w124-duoventil-heizungsventil-umwalzpumpe-bosch-a0018303784-392020028","title":"Mercedes W124 duo valve heater control valve auxiliary water pump Bosch A0018303784 0392020028","description":"\u003cdiv style=\"background:#242833;border-radius:8px;padding:18px 20px;margin:0 0 14px;color:#ffffff;\"\u003e\n\u003cp style=\"margin:0 0 8px;\"\u003e\u003cstrong style=\"color:#c69a3a;\"\u003eRefurbished original duo valve with auxiliary water pump – like new.\u003c\/strong\u003e Bosch\/Mercedes genuine part A0018303784 for the late W124: valve and integrated auxiliary water pump fully overhauled, all wear parts renewed, thoroughly cleaned – not an untested used part.\u003c\/p\u003e\n\u003cp style=\"margin:0;color:#cfd3dc;\"\u003eValve and auxiliary water pump completely overhauled  ·  Each valve individually tested  ·  \u003cstrong style=\"color:#c69a3a;\"\u003e5-year warranty\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp style=\"margin:0 0 14px;\"\u003e\u003cspan style=\"display:inline-block;background:#f5f6f8;border:1px solid #c69a3a;border-radius:8px;padding:5px 12px;margin:2px 6px 2px 0;font-weight:600;\"\u003eLeak-tightness ✓\u003c\/span\u003e\u003cspan style=\"display:inline-block;background:#f5f6f8;border:1px solid #c69a3a;border-radius:8px;padding:5px 12px;margin:2px 6px 2px 0;font-weight:600;\"\u003eFlow rate ✓\u003c\/span\u003e\u003cspan style=\"display:inline-block;background:#f5f6f8;border:1px solid #c69a3a;border-radius:8px;padding:5px 12px;margin:2px 6px 2px 0;font-weight:600;\"\u003eSwitching function ✓\u003c\/span\u003e\u003cbr\u003eAfter refurbishment, every valve is individually tested: leak test, flow test and switching test of both valve circuits.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#f5f6f8;border-left:4px solid #c69a3a;border-radius:8px;padding:14px 18px;margin:0 0 16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:700;\"\u003e5-year warranty on this refurbished part\u003c\/p\u003e\n\u003cp style=\"margin:0;\"\u003eShould a problem occur: send in the valve – we will repair or replace it. In addition, a 60-day return policy and free shipping within Germany apply.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003ctable style=\"width:100%;border-collapse:collapse;margin:0 0 16px;\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth style=\"text-align:left;padding:8px 6px;border-bottom:2px solid #242833;\"\u003eYour options\u003c\/th\u003e\n\u003cth style=\"text-align:left;padding:8px 6px;border-bottom:2px solid #242833;\"\u003eCondition\u003c\/th\u003e\n\u003cth style=\"text-align:left;padding:8px 6px;border-bottom:2px solid #242833;\"\u003eWarranty\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px 6px;border-bottom:1px solid #e3e5e9;\"\u003eMercedes new part\u003c\/td\u003e\n\u003ctd style=\"padding:8px 6px;border-bottom:1px solid #e3e5e9;\"\u003eno longer available\u003c\/td\u003e\n\u003ctd style=\"padding:8px 6px;border-bottom:1px solid #e3e5e9;\"\u003e–\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:8px 6px;border-bottom:1px solid #e3e5e9;\"\u003eUntested used part\u003c\/td\u003e\n\u003ctd style=\"padding:8px 6px;border-bottom:1px solid #e3e5e9;\"\u003eCondition of valve and pump unknown\u003c\/td\u003e\n\u003ctd style=\"padding:8px 6px;border-bottom:1px solid #e3e5e9;\"\u003enone\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f6f8;\"\u003e\n\u003ctd style=\"padding:8px 6px;font-weight:700;\"\u003e\u003cstrong\u003eRefurbished genuine part (this listing)\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px 6px;font-weight:700;\"\u003efully overhauled, all wear parts renewed, triple-tested\u003c\/td\u003e\n\u003ctd style=\"padding:8px 6px;font-weight:700;\"\u003e5 years ✓\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eHow can you tell if a duo valve with auxiliary water pump is faulty?\u003c\/h3\u003e\n\n\u003cp\u003eOne side stops heating, the heater stays permanently hot, or it fails completely – the symptoms vary and can affect one or both heating circuits. The duo valve sits in the engine bay on the bulkhead and pulses the heater water flow to both heat exchangers (side-separated temperature control, de-energized open = full heating output).\u003c\/p\u003e\n\n\u003cp\u003eTypical for the version \u003cstrong\u003ewith\u003c\/strong\u003e auxiliary water pump: at idle and low rpm the heater doesn't get properly warm, while it works at higher rpm – then the pump no longer delivers enough heater water.\u003c\/p\u003e\n\n\u003cp\u003eDetailed diagnostic guide in our guide: \u003ca href=\"\/en\/blogs\/mercedes-tacho-reparatur\/w124-umwaelzpumpe-heizung-duoventil-pruefen\"\u003eW124 heater cold at idle? Check the auxiliary water pump on the duo valve\u003c\/a\u003e\u003c\/p\u003e\n\n\u003ch3\u003eFits the following Mercedes models\u003c\/h3\u003e\n\n\u003cp\u003e\u003cstrong\u003eModel series 124 with automatic climate control or Tempmatik\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eW124 sedan\u003c\/li\u003e\n\u003cli\u003eS124 T-model\u003c\/li\u003e\n\u003cli\u003eC124 coupe\u003c\/li\u003e\n\u003cli\u003eA124 Cabriolet\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eThis version with integrated auxiliary water pump was generally fitted from approx. 08\/1991. Vehicles with manual heating (Bowden cable) do not use this valve.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003ePart numbers:\u003c\/strong\u003e A0018303784 \/ 0018303784 (Mercedes) · 0392020028 (Bosch). Price is per piece. Scope of delivery: see product photos.\u003c\/p\u003e\n\n\u003cdiv style=\"background:#f5f6f8;border-left:4px solid #c69a3a;border-radius:8px;padding:14px 18px;margin:0 0 16px;\"\u003e\n\u003cp style=\"margin:0 0 6px;font-weight:700;\"\u003e⚠ Important: compare the part number before buying\u003c\/p\u003e\n\u003cp style=\"margin:0 0 8px;\"\u003eThe version \u003cstrong\u003ewithout\u003c\/strong\u003e auxiliary water pump carries the number A0008306584 and is a different part – as are other deviating numbers. The number on your installed valve is decisive, please compare 1:1. We also have the version without pump refurbished in stock: \u003ca href=\"\/en\/products\/mercedes-duoventil-heizungsventil-a0008306584-w124-s124-r129-300-e-e320-sl-bosch\"\u003eDuo valve A0008306584 without auxiliary water pump\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes this part fit your car?\u003c\/strong\u003e Send us the VIN (chassis number) and model year – we'll check it for free: \u003ca href=\"tel:+491798991069\"\u003e0179 8991069\u003c\/a\u003e (Mon–Fri 8 am–6 pm) or via our \u003ca href=\"\/en\/pages\/contact?thema=Ersatzteil\"\u003econtact form\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\n\u003ch4\u003eWhat warranty is provided?\u003c\/h4\u003e\n\n\u003cp\u003e5-year warranty on this refurbished part. If there's a problem, simply send the valve back to us – we'll repair or replace it. Plus a 60-day return policy and free shipping within Germany.\u003c\/p\u003e\n\n\u003ch4\u003eHow does it differ from the valve without pump?\u003c\/h4\u003e\n\n\u003cp\u003eThis version has an integrated electric auxiliary water pump that circulates the heater water at idle and low rpm. It carries the part number A0018303784 and was generally fitted from approx. 08\/1991. The version without pump (A0008306584) is not interchangeable.\u003c\/p\u003e\n\n\u003ch4\u003eHow is the valve tested?\u003c\/h4\u003e\n\n\u003cp\u003eAfter refurbishment, every valve goes through our own, in-house developed test procedure with three stages: leak test, flow test and switching test of both valve circuits. The part only goes on sale once it has passed all three.\u003c\/p\u003e\n\n\u003ch4\u003eWhy is there no new part?\u003c\/h4\u003e\n\n\u003cp\u003eMercedes no longer supplies this valve, and there is no aftermarket version on the market. That's why we fully refurbish genuine parts – condition \"like new\".\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eKFZTeile-Thot\u003c\/strong\u003e is specialized in spare parts for classic Mercedes. Every duo valve from our refurbishment program goes through our own, self-developed testing and refurbishment process.\u003c\/p\u003e","brand":"Bosch","offers":[{"title":"Default Title","offer_id":54984557658441,"sku":"60798","price":348.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0913\/5344\/8777\/files\/57_9581c1a6-d5b1-4602-8e4f-ff16df6fb848.png?v=1785733811","url":"https:\/\/kfzteile-thot.de\/en\/products\/mercedes-w124-duoventil-heizungsventil-umwalzpumpe-bosch-a0018303784-392020028","provider":"KFZTeile-Thot","version":"1.0","type":"link"}