I was reading about this and one of the alleged benefits is that if you change to the waterless coolant, the cooling system is not pressurised to the same extent it is with normal water/antifreeze mix.

Would this have a beneficial effect on, for example, extending the life of the heater matrix as the lack of pressure might reduce strain on it? Or is my theory incorrect. Just wondering whether the change is worth doing as it costs a bit.

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Cherry Rallye SOLD

In terms of actual cooling water is pretty much the best fluid to transfer heat away. Even they admit that it runs hotter:

"The operating temperature of the engine and coolant may increase slightly, by approximately 3-7 degrees. However the temperature inside the engine will be consistent and steam vapour will not be produced. i.e engines often run cooler with Evans Waterless Coolants"

Although curiously they do claim it runs 3-7 degrees hotter but also cooler at the same time.


The cavitated water pump is replaced when you do a cambelt change and if you flush coolant at recommended intervals and have corrosion inhibitors and anti-freeze in the mixture as you normally would I don't really see what the problem with running water as a coolant is.

A properly serviced water cooled system should be more than adequate and I'm not sure why you'd 'upgrade' to something that runs hotter to solve a problem that doesn't really exist? In other words, it already works perfectly so in what way would it be an improvement?

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61k miles Ph.1 Diablo '6 Project Thread

That is what I was wanting to establish.

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Cherry Rallye SOLD

How much is it?

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andrew315rawson@live.co.uk
Moonstone phase 7 gti6
My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1

That is a good point, and I've never had to change a heater matrix but realise that taking the dash out is probably a right pain!

I would consider that a Nissens heater matrix is about 30-40 pounds and the original ones seem to break after 10-15 years so hopefully the replacement then lasts the life of the car?

I've no idea whether or not it would last longer at low pressure, I'm not familiar with which part it is that starts to leak first etc. Do you not need a different pump etc. as well?

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61k miles Ph.1 Diablo '6 Project Thread