Volvo 240 1991 Owner's Manual page 108

Volvo 1991 240 Model
Maintain fluid level between MAX and MIN marks on expansion tank. Mixture of 50 percent Volvo
antifreeze type C (blue-green) or similar and 50 percent water should be used. See "Coolant" section.
Brake fluid
Without removing the cap, check that the level is above the MIN mark. Brake fluid DOT 4. See "Brake
fluid" section.
Battery
Check level in conjunction with normal service or once a year. Electrolyte level 1/4" - 3/8"(5-10 mm)
above plates. Use distilled water. Never add acid.
If the radio has an anti-theft code and the battery has been disconnected, the code must be reentered
before the radio will function properly.
Warning:
Battery gases are explosive if brought in contact with open flame or
sparks.
Washer fluid
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Washer fluid Coolant reservoir