Julian Klauza

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How to safely mix old antifreeze with new one?

Mixing the existing glycol with new one is a procedure used to top up the system fluid and to maintain the optimal quality of the mixture. If you want to find out how to properly combine antifreeze fluids, make sure to read this article.

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Mixing antifreeze fluids

Topping up antifreeze is practised in a few cases. One of them is glycol leakage due to a system failure, when the system must be filled with the amount of glycol that has leaked out. Another case is adding antifreeze concentrate to lower the freezing point of glycol. Antifreeze fluids are also mixed when the existing system needs to be expanded.

How to properly mix glycols?

If you are considering topping up your system with glycol, you need to take care of several issues beforehand. First of all, check the existing antifreeze in your system. It is advisable to carry out a test, which will show the condition of the fluid you are currently using. It will allow to estimate whether it would be better to top up glycol or to refill the system with new antifreeze fluid. Another important factor is checking the compatibility and operating temperature of the fluids you are planning to mix. Both glycols must be manufactured using the same technology and the same base product. Adding mains water to the system is not permitted. Diluting glycol with water may lead to corrosion and reduce the efficiency of the system. It is also not recommended to add pure raw material to the system, as it does not contain additives that have protective properties. The best solution is to mix fluids by the same manufacturer – then you are not risking voiding the warranty on the fluids and you avoid the potential problem of forming precipitates in such a mixture.

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