Which statement about glycol-water quality control is true?

Which statement about glycol-water quality control is true?

• A. It is optional and rarely checked
• B. It relies solely on color
• C. It involves regular tests for glycol concentration, pH, corrosion inhibitors, and leak monitoring, followed by replenishment as needed
• D. It is irrelevant to system corrosion

Answer: (C)

Regular monitoring and maintaining glycol-water quality is essential to protect the cooling system from freezing, scaling, and especially corrosion. Keeping the glycol concentration within the recommended range ensures adequate freeze protection and appropriate flow characteristics; measuring this with a refractometer or similar test shows whether the mix is too diluted or too rich. Controlling pH prevents corrosive attack on metal components, since glycol solutions can drift in acidity or basicity over time and with use. Adding the right corrosion inhibitors helps form a protective film on metal surfaces, reducing wear and rust in the system. Leak monitoring is also crucial because even small leaks can dilute inhibitors and glycol concentration, increasing corrosion risk and reducing cooling efficiency. When test results indicate deviations, replenishment and adjustment—restoring glycol levels, adjusting pH, renewing inhibitors, and repairing leaks—keep the system protected and functioning properly. Color alone is not a reliable indicator of quality, and quality control is not optional, since poor glycol-water management directly contributes to corrosion and system damage.

Regular monitoring and maintaining glycol-water quality is essential to protect the cooling system from freezing, scaling, and especially corrosion. Keeping the glycol concentration within the recommended range ensures adequate freeze protection and appropriate flow characteristics; measuring this with a refractometer or similar test shows whether the mix is too diluted or too rich. Controlling pH prevents corrosive attack on metal components, since glycol solutions can drift in acidity or basicity over time and with use. Adding the right corrosion inhibitors helps form a protective film on metal surfaces, reducing wear and rust in the system. Leak monitoring is also crucial because even small leaks can dilute inhibitors and glycol concentration, increasing corrosion risk and reducing cooling efficiency. When test results indicate deviations, replenishment and adjustment—restoring glycol levels, adjusting pH, renewing inhibitors, and repairing leaks—keep the system protected and functioning properly. Color alone is not a reliable indicator of quality, and quality control is not optional, since poor glycol-water management directly contributes to corrosion and system damage.