Engine Repair (A1)第 9 / 120 题
A radiator pressure cap raises the system's boiling point primarily because:
a.It adds antifreeze to the coolant
b.Increased pressure raises the coolant's boiling temperature
c.It lowers the coolant level
d.It speeds up the water pump
解析
Sealing the system under pressure raises the boiling point of the coolant, allowing higher operating temperatures without boil-over. A weak or faulty cap lowers the effective boiling point and can cause coolant loss. Caps should be pressure-tested when overheating is suspected.
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