[Vwdiesel] Blockheaters. ---- ( 1984 1.6L Turbo Rabbit. )

Roger Brown r.c.brown at ieee.org
Mon Mar 15 19:20:42 EST 2004

Chuck Carnohan wrote:
> >From what I understand, pure antifreeze will actually freeze faster than
> the water-diluted mixture.  I can't imagine why, but that's what a
> mechanic friend here in Idaho swears.  Also, the low or no phosphate
> antifreeze is supposed to be the only kind to use in diesels due to
> possible cavitation.  This is supposed to be cause by the phosphates
> attacking the water jacket or cylinder walls of the engine block or head
> as creating tiny pin holes.  I've read that the vibration of the diesel
> engine exacerbates this somehow.  So, just to be safe I've started using
> the phosphate-free antifreeze mixed with distilled water at 50/50.  It's
> a pretty color also!

Its called "Freezing Point Depression", a mixture of two liquids can have a lower freezing point than either of the two liquids in pure form:
Same thing happens to the boiling point, but in reverse (boiling point elevation).

Also, pure glycol is not as good a heat conductor as water, so pure glycol is not the best option.

If you want to run a non-aqueous cooling system, look into Evans Cooling:


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