Whether you are simply topping up or want to flush and fill the entire system, there is no need to dilute. Simply pour directly into the cooling system. To fill the entire coolant system, we recommend you flush the system before adding Holts coolant. 1. Make sure the engine is cool. 2. Add Holts coolant to the level recommended in the vehicle handbook. 3.Run the engine up to operating temperature, then switch off and allow to cool. 4. Check coolant level and add more coolant as required.
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