A hydrometer is required to check the antifreeze content in the coolant. Each type of antifreeze has its own specific gravity. For this reason, it is recommended to subtract 2-3°C from the value obtained by measuring the density.
1. Use a hydrometer to take some coolant from the expansion tank (see arrow in illustration). The float of the hydrometer, depending on the density, will sink to a certain depth.
2. Read off the gravity of the coolant to determine at what temperatures freeze protection will be provided. Some models of hydrometers have an arrow indicator of the degree of protection against freezing. In most cases, this check reveals that the concentration of antifreeze in the coolant is insufficient to provide adequate freeze protection. For this reason, antifreeze must be added to the coolant. As a rough estimate, approximately ¼ liter of antifreeze will increase frost protection by approximately 10°C.
3. Remove the engine mudguard.
4. Place a suitable container under the vehicle to collect the coolant.
5. Remove the drain plug on the bottom of the radiator, or remove the bottom coolant circulation hose from the radiator and drain 1-2 liters of coolant.
6. Replace the hose and secure it, or screw in the drain plug.
7. Fill in the appropriate amount of undiluted antifreeze and pour in the drained coolant.
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