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Hotter coolant temperatures with Evans ……. what the?!

On many occasions people spend their hard earned cash on Evans Coolant only to discover that, once installed, coolant temperatures actually rise.  To most users of Evans this is a shock, especially when they expect ‘cooler temperatures’.  In a flash the Evans is removed and replaced back to the original 50/50 water-based coolant.

Firstly, it is important to understand that Evans Cooling Systems make it no secret that Evans Coolants may result in warmer coolant temperatures, however it is important to understand why this happens and why it is safe for your engine…… and in actual fact your system is running cooler overall.

Secondly, Evans has no water, its waterless, so don’t expect it to function like water.

So before installing Evans Coolant, it is important to understand what to expect and to make sure that you do not have unrealistic expectations.  It is also important to note that every cooling system is different and that Evans will work better depending on how well your cooling system is designed.

Evans will not make up for a poorly designed cooling system.

Difference in Heat Dissipation

When using water-based coolant in your cooling system it is critical that hot coolant dissipates as much heat as possible through the radiator so that cooler coolant re-enters the engine.  If this process is flawed then overheating occurs.  Evans will dissipate less heat through the radiator.  That’s the great thing about Evans, the overall cooling of your engine is less reliant on heat dissipation and does not have to work within the limitations of water……. why?  Because Evans will not boil until 190C, meaning that if your coolant is a few degrees warmer entering the engine, it will remain in its liquid form and still function as a coolant, whereas water will form steam and that steam will inhibit heat transfer, leading to eventual overheating (under certain situations)

Metal surface temperature Vs Coolant Temperature

Coolant temperature is not a great indication of metal surface temperature.  The coolants sole responsibility is to transfer heat from the metal surface.  You do not want your engine to retain heat. Evans does a great job at this by eliminating ‘hot spots’ in the cooling jacket and providing even heat transfer.  Certain parts of the engine are hotter than others, meaning, while water-based coolant will do a great job of transferring heat from the cooler areas, in the hotter parts of the engine the coolant fails and creates steam pockets.  These steam pockets, do not transfer heat, therefore the metal surface will retain the heat.  Evans ensures that there is liquid-to-metal contact at all times even in the hottest parts of the engine.  This way Evans can continue to transfer heat from the metal surface, protecting your engine.

So even though your coolant temperature might be slightly higher, your metal surface temperatures in the hottest parts of the engine will be cooler.

Nothing replaces a well designed cooling system

Evans will not replace the need for a well designed cooling system.  A poorly designed cooling system will exaggerate coolant temperature increases when using Evans.

All components in your cooling system must match the heat generated by the engine.  For example, an engine putting out 700HP needs an upgraded cooling system to ensure it can handle to extra heat generated.

Evans Cooling Systems are often asked for advice on why their engine ‘runs hot’.  There are many possibilities, and you are better off consulting with a mechanic or engine builder, however if you have a well designed cooling system and your coolant temperatures are still too high, Evans will be a great addition.

Why do you want to run cooler?

Everyone wants their engine to run cooler…..

Evans is often told by their customers that they want to bring temperatures down. “My coolant temperatures are 90C but want to bring them down to 80C-85C.”


Most of the time it is the fear of overheating, no problem on the highway but as soon as airflow is reduced, coolant temperatures hit 100C.

In most cases Evans will not reduce your coolant temperature, however it will make it safe to run at 90C-100C.  But remember you metal surfaces are much better protected!

A lot can be discussed when talking coolant temperatures; however it is important to understand the likely outcome from using Evans. Don’t dump the coolant, contact Evans for further consultation, and feel at ease when using Evans.

For more information on using Evans in your engine contact Evans Cooling Systems (03) 9360 4333 or