Kia Optima Hybrid 2017 Owner's Manual page 533

What to do in an emergency
CAUTION
• Serious loss of coolant indicates
there is a leak in the cooling sys‐
tem and we recommend that the
system be checked by an author‐
ized Kia dealer.
• When the engine overheats from
low engine coolant, suddenly add‐
ing engine coolant may cause
cracks in the engine. To prevent
damage, add engine coolant slowly
in small quantities.
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