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Formula Determines Proper Glycol Levels For Adequate Boil Point Control
The amount of coolant to drain and glycol concentrate to add is equal to the system's capacity times the target glycol concentration minus the current glycol concentration divided by 100% minus the current glycol concentration.
Example - Glycol Level Too Low:
The glycol concentration of a 40-quart cooling system is 40%. We want to adjust the glycol concentration to 50%.
| Gc | = | Current Glycol Concentration (%) | = | 40% |
| Gt | = | Target Glycol Concentration (%) | = | 50% |
| C | = | System Capacity (in Quarts, Liters, or Gallons) | = | 40 Quarts |
| D | = | Amount of coolant to Drain and glycol concentrate to add (in like units) | = | ? Quarts |
Drain 7 quarts of coolant and replace with 7 quarts of glycol concentrate. When adding glycol concentrate to correct low glycol levels, measurements can be simplified by rounding up. When adding water to correct high glycol levels, simplify by rounding down.
Correcting High Glycol Levels
| Gc | = | Current Glycol Concentration (%) |
| Gt | = | Target Glycol Concentration (%) |
| C | = | System Capacity (Quarts, Liters, or Gallons - use the desired units) |
| D | = | Amount to Drain and Amount of Water to Add (same units as C) |
The amount of coolant to drain and water to add is equal to the system's capacity times the current glycol concentration minus the target glycol concentration divided by the current glycol concentration.
Example - Glycol Level Too High
The glycol concentration of 10-gallon cooling system is 60%. We want to adjust the glycol concentration to 50%.
| Gc | = | Current Glycol Concentration (%) | = | 60% |
| Gt | = | Target Glycol Concentration (%) | = | 50% |
| C | = | System Capacity (in Quarts, Liters, or Gallons) | = | 10 Gallons |
| D | = | Amount of coolant to Drain and glycol concentrate to add (in like units) | = | ? Gallons |
Drain 1.5 gallons of coolant and replace with 1.5 gallons of distilled water. When adding water to correct high glycol levels, measurements can be simplified by rounding down.
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