Scale buildup of mineral and deposits are found in the cooling system.

• A. False
• B. True
• C. Only in the heater core
• D. Never occurs

Answer: (B)

Mineral-rich coolant can drop out of solution as the system heats and circulates, forming scale deposits on the inner surfaces of the cooling loop. This buildup can occur wherever the coolant travels or sits, including the radiator, heater core, and various passages and jackets inside the engine. The heater core is a common spot because it consists of many small tubes where flow can slow and temperatures change, but scale is not confined to it. Deposits hinder heat transfer, narrow passages, and reduce coolant flow, which can lead to overheating or reduced heater performance. Regular coolant maintenance with the correct mix and periodic flushes using distilled water helps minimize this buildup. So the statement is true: scale buildup of minerals and deposits can be found in the cooling system.