Volvo D 20 Service Manual page 71

Group 21 Engine
Timing gear belts, replacement
Bleeding ot cooling system
Disconnect upper hose from cold
drip pan beneath hose 6nd hold
edge of expansion tank.
stan d€vice. Place
hose level with top
Coolant
S i n c e a l u m i n i u m i s u s e d i n t h e e n g i n e s , a c t i v e c o r r o '
sion protection is necessary in the coolant to help pre-
vent corrosion d6mage,
U s e g e n u i n e V o l v o b l u e - g r e e n c o o l a n t t y p e C , d i l u t e d
with clean water in proportions of 50/50.
This mixture helps to prevent coiiosion and frost
N e v e r f i l l t h e c o o l i n g s y s t e m w i t h w a t e r a l o n e .
T h e c o o l a n t s h o u l d b e c h a n g e d r e g u l a r l y s i n c e t h e c o r
rosion protective additives in the cootant tose their ef-
Notel Do not run engine when ievelofcoolant is
low since high local temperatures can result
which mav cause the cvlinder head to crack.
Replacing coolant
Always use typc C blue-green coolanr. Remember to
replace decal 1PlN 1331473-7)
on expansion tank if ne,
Type C blue-green coolant
All diesel and petrol (gasoline) engines manufactured
since 1982 are filled with tvDe C coolant.
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