Size coolant expansion/overflow tank based on system volume and thermal expansion from cold to operating temperature.
Input Parameters
Results
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Expansion Volume
quarts
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Min Tank Capacity
quarts
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Volume Change
%
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Cold Fill Level
%
Note: Expansion tank must accommodate thermal expansion plus a safety margin. Pressurized systems (13-18 psi cap) reduce expansion and raise boiling point. Fill to cold mark when cool.
Reference
Expansion % = β × ΔT(°C) × 100
β: 50/50 EG=0.00045, 60/40=0.00050, Water=0.00021 /°C
Expansion Volume = System Vol × Expansion%
Min Tank = Expansion × 2.5 (safety factor)
Cold fill: ~40% of tank capacity