Section 14 (Specifications & Drive Belt Routing): Servicing
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The coolant does not usually need replacing. In the case of larger repairs when coolant needs to be drained, new coolant must be used because the old has been exposed to oxidation and dirt. Clean the cooling system when replacing coolant. Use Volvo cleaning agent (P/N 3979850). Fill with 50/50 mix of clean water and coolant.