40 Cooling System Coolant consists of clean water and antifreeze. This mixture should never be less than 40% antifreeze and 60% clean water or more than 60% antifreeze and 40% clean water. Mix the antifreeze and water to the required concentration before adding to the cooling system. Note: DO NOT mix different products, such as regular antifreeze and extended life antifreeze. W2003082 Note: Volvo Trucks North America, Inc. does not recommend the use of antifreeze based on propylene glycol. Coolant, consisting of an antifreeze solution in water, should be used year-round to provide freeze and boil-over protection as well as providing a stable environment for seals and hoses.
The solution needs to be tested for proper additive levels at regular intervals (see page 47 for testing SCA levels), unless extended life antifreeze is used. Adjust additive concentration if not at the proper levels. Note: DO NOT use antifreeze formulated for automobile gasoline engines. These have a very high silicate content that will clog the radiator and leave unwanted deposits in the engine.