Coolant change

Antifreeze does not last forever: its additives are depleted over time, the fluid loses its corrosion protection and can start attacking the aluminium cylinder head, radiator and water pump.

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Symptoms

The coolant has darkened or browned, with sediment or flakes in the tank.

What's included

Visible signs include darkened or brown fluid, sediment or flakes in the expansion tank. We drain the old fluid, flush the system when needed, fill it with the correct antifreeze type and remove air locks; these are what cause apparent overheating and a cold heater after a replacement. Different antifreeze types must not be mixed: their additives can react and form sediment that clogs the heater core. We check the result under pressure and with the engine warm. Antifreeze replacement in Kyiv includes selecting the proper fluid type for the particular engine.

Additional checks

Assessing whether the system needs flushing before refilling
Bleeding air locks — the cause of apparent overheating and a cold heater
Checking the result under pressure with the engine warm

Why it matters

Old coolant loses its anti-corrosion properties and eats into the aluminum of the head, radiator, and pump. Mixing different coolant types isn't allowed — the additives clash and clog the heater core.

More details

Coolant isn't a permanent fluid: over time the additives get used up, the fluid loses its anti-corrosion properties, and it starts eating away at the aluminum in the head, the radiator, and the water pump. The visible sign is fluid that's darkened, turned brownish, with sediment or flakes appearing in the tank. We drain the old fluid, flush the system if needed, refill with the correct type of coolant, and always bleed the air pockets — they're exactly what causes false overheating readings and a cold heater after a fluid change. Different types of coolant must not be mixed: the additives react with each other and precipitate, clogging the heater core. We check the result under pressure and with the engine warmed up. We change coolant in Kyiv using the fluid type selected for the specific engine.

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Describe the vehicle and symptoms, and we will suggest which check to start with.