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

[Roger Brown]

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:
	http://tutor2.oit.unc.edu/Campus/LC/LCenter.nsf/0/3abb65980cec29ae8525659400532b8b?OpenDocument
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:
	http://www.evanscooling.com/index2.html

-- 
   Roger