[Vwdiesel] Avoidance of Glycol in Coolant

Val Christian val at swamps.roc.ny.us
Sat Jul 12 10:25:03 EDT 2003

I have had several first-hand experiences similar to Shawn's.
There are certainly times I run straight water, but it's generally only
to escape having to spend the $$ on glycol, and it's always intended to
be short term.  VW has made the water pump a cherished chore on most
engines, and I don't like the practice.

The way I see it, the cooling benefits clearly lean towards the use
of glycol.  A 50-50 mix is not required.  A 25% mix provides substantial
cooling benefit.

Can anyone talk about the different additive packages for diesel vs.
non-diesel cooling systems?


> On 11 Jul 2003 at 21:52, LBaird119 at aol.com <LBaird119 at aol.com> wrote:
> > > Question :  for summer driving I use no glycol ---what can I get at walmart
> > > for the water that works. ???.
> > >
> >   You don't use anti-freeze/coolant in the summer?  Why?  It keeps the
> > system from rusting as well as raising the boiling temp. of the water.
> >      Loren
> I would also be concerned about the longevity of your water pump. I've
> heard that a proper coolant mixture helps prolong the life of the seals and
> lubricates the pump. Two summers ago, my Jetta lost most of the coolant
> several times while my wife was driving, due to a cracked sensor in the
> tank. I fixed the sensor, but had no extra coolant, so it was straight water
> in the system. I forgot to correct this for a few months, when I was met
> with a sudden water pump bearing failure. It was then that I recalled
> hearing that coolant is good for the pump and/or seals. The pump in
> question was only about 2 years/40k kms old. The previous water pump
> had gone well over 250k kms before it failed. Coincidence? Perhaps, but
> changing these waterpumps is not my favourite task, so I'd rather play it
> safe, and get the extra corrsion protection/boiling temp increase, etc.
> --
> Shawn Wright
> http://Zuiko.sls.bc.ca/swright
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