Coolant or antifreeze: what it is, what it does and how often to change it
Coolant and antifreeze are the same thing, and they do a silent but vital job: keeping your engine from freezing in winter or boiling in an August traffic jam in Málaga.
Coolant and antifreeze are the same thing, even if the name confuses. It does a silent but vital job: keeping your engine from freezing on a cold night or boiling in an August traffic jam in Málaga. It’s one of those fluids nobody remembers… until the temperature needle turns red.
What it really does
It keeps the engine at its ideal temperature and protects the circuit from the inside against corrosion. Without it, the engine overheats, and a serious overheat can end in a blown head gasket or worse — one of the most expensive failures there is.
It isn’t “coloured water”
Coolant carries anti-corrosion and anti-scale additives that run out over time, even while the liquid still looks coloured. That’s why it’s renewed by date, not just when it “looks dirty”.
2–5 yrs
or 60,000–150,000 km
≠
never mix incompatible types
€0
surprises: fixed price up front
How often to change it
It depends on the antifreeze type, but it’s usually every 2–5 years or 60,000–150,000 km. Your car’s data has the final word, and it’s the first thing we check.
What you really must avoid
More important than the exact date is not mixing incompatible types. Combining technologies that don’t get along can form sludge that clogs the circuit and radiator. A slip here gets very expensive.
What about colour? Can I add water?
The colour hints at the technology family, but the manufacturer spec rules, not the shade. Two same-coloured fluids can be incompatible, so never top up “by eye”.
| Family | Usual colour | Bear in mind |
|---|---|---|
| G11 | Blue / green | Older technology |
| G12 / G12+ | Pink / red | Don’t mix with G11 |
| G13 | Purple / lilac | Newer, different base |
Plain water: emergency only
If you run out of coolant on the road, water gets you out of trouble for the moment, but it won’t protect against corrosion or freezing and boils sooner. Refill with the correct fluid as soon as you can.
We check the level, condition and the exact type your car requires, and use that one. No topping up with “whatever was around”. And if we spot a leak, we tell you before touching anything, with the price up front.
Is your car due?
Discover our coolant change in Málaga and, while we’re on fluids, also check the brake fluid.
Key takeaways
- Coolant = antifreeze: prevents freezing and overheating
- Guide interval: 2–5 years or 60,000–150,000 km
- Never mix incompatible types
- Plain water is only an emergency fix
Frequently asked questions
What if the coolant level is low?
A low level raises the temperature and risks the engine. It may be normal consumption or a leak. Get it checked soon; we inspect level and circuit with no obligation.
