![]() Every vehicle is different, so consult your Haynes manual or get in touch with your manufacturer's customer services department for advice. In the case of the author's SLK55, Mercedes-AMG recommends changing the coolant (known as Organic Acid Technology) every 15 years. Most manufacturers of modern cars recommend 10-year intervals, or with very recent cars, the coolant won’t require changing - providing the correct antifreeze is used. Don't be tempted to switch to Organic antifreeze (see below), because it could damage your engine’s seals and other cooling system components. If you're running a classic car and it uses glycol ethylene based antifreeze, which is often blue, it'll need to be renewed every couple of years. If you're changing the coolant as part of a standard service procedure, you'll get different answers depending on who made your car and which antifreeze you use. Head here to find out why coolant gets low. In an ideal world you shouldn't need to top up the coolant, but hoses and seals eventually degrade and leaks occur. Learn how all of the cooling system's elements work together here. Other important elements are radiator fan(s) and the thermostat, which come into play once the coolant is up to operating temperature. So even if you live in a hot country, where there's no chance of freezing weather, you should never fill the coolant system with just water.Ī typical coolant system comprises a series of pipes that run between the engine block, the radiator and an expansion tank. It not only keeps it at the right temperature but it helps to prevent corrosion, with rust inhibitors that extend the engine's life. Your car’s coolant is vital for the engine's operation. Discover which Haynes Manual is best for you.NEW Fault Finder - Diagnose the problem.
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