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Mistakes to Avoid with Coolant

Model: (Various brands) Various
Part: Antifreeze coolant

Video tutorial

The main mistake to avoid is mixing different types of coolant; the second is using only water, which can corrode the heads and boil prematurely. Also, allowing the coolant to age too much is a serious error.

Remember that after changing the coolant, you must carefully bleed the air. Do not use sealants as a permanent solution, as they can block the heater core passages; do not ignore small leaks: a drop can become a hole over time; never reuse old clips, but use new ones; an invisible leak lowers the boiling point.

Pressurise the system when cold to find cracks or faulty joints.

Do not rely too much on the temperature gauge; use an OBD reader for the actual temperature. Use OEM thermostats that can highlight overheating; frequently check the condition of the expansion tank; listen for the fans: if they do not turn on, it indicates a fault.

Finally, the radiator cap must always be in good condition.


Posted on 17 June 2026 by ScegliAuto


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