Supplemental coolant additives are best described as which of the following?

Supplemental coolant additives are best described as which of the following?

• A. A water-soluble chemical compound that protects metal surfaces of the cooling system against damage and corrosion
• B. A solvent to dissolve scale
• C. A fuel additive for improving combustion
• D. A thickener to increase coolant viscosity

Answer: (A)

Supplemental coolant additives are intended to protect the cooling system from corrosion by forming a protective layer on metal surfaces that are exposed to hot, circulating coolant. They are typically water-soluble chemical inhibitors that ride along with the coolant to reduce rust, pitting, and other forms of metal damage in components like pumps, heat exchangers, and hoses. This keeps the system reliable and extends the life of the metal passages. The other descriptions don’t fit the primary purpose: solvents to dissolve scale target mineral buildup rather than protecting metal surfaces; fuel additives are for combustion rather than cooling systems; thickeners would change viscosity but wouldn’t provide corrosion protection.

Supplemental coolant additives are intended to protect the cooling system from corrosion by forming a protective layer on metal surfaces that are exposed to hot, circulating coolant. They are typically water-soluble chemical inhibitors that ride along with the coolant to reduce rust, pitting, and other forms of metal damage in components like pumps, heat exchangers, and hoses. This keeps the system reliable and extends the life of the metal passages.

The other descriptions don’t fit the primary purpose: solvents to dissolve scale target mineral buildup rather than protecting metal surfaces; fuel additives are for combustion rather than cooling systems; thickeners would change viscosity but wouldn’t provide corrosion protection.