Refilling coolant

Coolant helps keep the gasoline engine at the proper operating temperature. The heat transferred from the engine to the coolant can be used to warm the passenger compartment.

When refilling coolant, follow the instructions on the package and use the recommended amount of coolant. Never fill the cooling system with water only; this could lead to freezing, corrosion and engine damage.

 Warning

If the engine has been running, the coolant will be very hot. Allow the engine to cool before opening the coolant expansion tank. If this is not possible, open the cap very slowly to allow pressure to dissipate.
P5-1617-S90/V90 Overview engine coolant
Coolant expansion tank
P5-1617-S90/V90 Engine coolant refill 1
P5-1617-S90/V90 Engine coolant refill 2
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Unscrew the cover in the bulkhead.

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Unscrew the expansion tank cap and add coolant. The level should not exceed the yellow MAX marker in the tank.

Put the other components back in place in the reverse order.

 Important

  • High levels of chlorine, chlorides and other salts may cause corrosion in the cooling system.
  • Only use coolants with corrosion protection recommended by Volvo.
  • The ratio of coolant to water is 50/50.
  • Mix the coolant with tap water of drinkable quality.
  • If maintenance is performed on the cooling system or if the coolant is replaced, flush the cooling system with clean water before adding new a new coolant/water mixture.
  • The engine may only be operated with a properly filled cooling system. Otherwise, high temperatures and cracks in the cylinders may occur.