In case you’re asking ‘what temperature does antifreeze freeze, water freezes at 0° C, or 32° F. As the name suggests, antifreeze prevents the coolant inside your engine from freezing under normal winter conditions. The chemicals in antifreeze have huge benefits, and not only in winter. Antifreeze has many benefits to the engine cooling system. Ethylene glycol, or a more recent, less hazardous additive, but far more expensive propylene glycol can also be used. Typical colour of engine coolant / antifreezeĪntifreeze is a combination of distilled water and a type of alcohol. The colour of the engine coolant does not necessarily indicate a specific type. Engine coolant or antifreeze does in fact come in a variety of colours from green, yellow, pink, red, or orange. Commonly seen as a green colour as the bottle to the right suggests, engine coolant is a mixture of water and antifreeze. To ensure the engine is kept at an optimal running temperature, engine coolant is used. Veins in the radiator contain the hot coolant which air cools as the vehicle moves forward.Īirflow through the veins is maintained by a fan if the vehicle becomes hot due to being stationary for long periods.Ī significant number of engine failures are attributed in some way to engine cooling problems. The engine coolant becomes hot itself and so is transferred to a radiator located at the front of the car. Around half of this heat goes out of the exhaust, whilst the remaining heat remains inside the engine block.Ĭar engines need a way of cooling down else they will continue to increase in temperature until the working metal components inside will begin to literally melt, fuse together and the engine will seize. Engine coolant is a water based liquid that absorbs the heat from the engine. Some of this energy is used to move the vehicle forward (around one third), the other two thirds of the energy produced is converted to heat. As such, our testing is done with off-the-shelf retail products so you can see exactly how your coolant will look and perform when it arrives.Car engines create a great deal of energy by burning petrol or diesel. To do this properly, you'd need at least six months of testing per coolant with a heat source and this just wasn't possible, not to mention many of the coolants likely going end of life before we published the results. While long term testing to identify weaknesses in the coolants when used over longer periods with heat loads is preferable, this wasn't possible in the short time scale we had for testing. We allowed each coolant to rid itself of air bubbles until non were visible in the coolant, tubes or audibly in the pump or blocks. We then flushed each coolant out with deionised water, draining this as best we could between fills to ensure that there was no residual coolant left and only a minimal amount of deionised water – this is the best compromise between either leaving the loop drying for days on end or having six individual loops, which is clearly very impractical. We filled the loop with deionised water to start with, then drained it, emptying each component, and filled the loop with the first coolant. To measure flow rate, we used a Cole Palmer 120-1200LPH Flow Meter, reading results in litres per minute to obtain a more accurate reading given the meter is analogue. We record the ambient room temperature to present the result as a delta T (the difference between the temperature of the CPU and the ambient temperature), to deal with any slight variations in the temperature in our testing environment. The system was run with deionised water for a week to allow the thermal paste to cure. We've included the data we obtained in our last test to see which coolants are best overall too.Īs you’d be a little crazy to water-cool your PC if it isn’t overclocked, we’ve used an Intel Core i5-2500K, which has been overclocked to 4.7GHz using vcore of 1.4V. This time, we're looking at some of the non-UV coolants on the market, and also two of the latest pigment and pearlescent-effect coolants from Mayhem's, to see if all those pretty additives have a negative impact on performance. It's also worth remembering, then, that your purchase of coolant should be on looks and value alone - with all coolants we've tested so far performing nearly identically, and none offering long term protection against leak damage (all coolants we've tested will eventually become conductive, even if its slightly so), only cost and eye candy are of real concern. As most are water-based or have water-like consistency, this isn't surprising, and means that looks are far more important if you're after colour or UV reactivity. In our previous roundup of six of the latest UV coolants, we found that they all performed very similarly with a modern pump, with no significant variations in flow rate or temperatures.
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