Engine Coolant Reservoir. Pressurized Coolant Reservoir. Coolant Reservoir. 2005-2010 Volvo V50 Engine: 2.4L L5; To Chassis No. 590035; From Chassis No. 601388; Position: Front;. 2005-2011 Volvo V50 Engine: 2.5L L5; To Chassis No. 590035; From Chassis No. 601388; Position: Front;.