[s-cars] Engine Coolant Flushing Procedure when switching to G12

[Harold McComas]

Dave and others,
why is it that the G12+ is rarely mentioned in North America. I am getting 
some US spec parts for a MkII Golf for a guy in Austria and he said," OH, 
the G11 and G12 is old stuff "  and "G11 is almost impossible to find here, 
so why bother". I readily found G11 (and G12) at a local parts place, no 
such luck on G12+. Even went to http://www.crpindustries.com/pentosin.htm 
( which sucks BTW for info) and found no mention of it.

G12+ can be mixed with either G11 or G12 with no issues, or so I have read. 
Next coolant flush ( in 2 years) I want to try the Purple G12+.

Harold

> From: "Dave Forgie" <forgied at ae.ca>
> Subject: [s-cars] Engine Coolant Flushing Procedure when switching to
> G12
> To: "s-car" <s-car-list at audifans.com>
> Message-ID: <s545c19a.077 at mail.ae.ca>
> Content-Type: text/plain; charset=US-ASCII
>
> The following is supposedly from a VAG Technical Service Bulletin
> (TSB):
>
> ***********************
>
> Unlike the previous "G11" coolant, this newly developed "G12" product
> permits a cooling system fill that lasts the service life of the
> engine and was designed with all-aluminum engines in mind.
>
> Advantages over previous coolant:
> Improved corrosion protection
> Improve thermal stability
> Improved heat transfer/control
> Improved hard water tolerance
> Improved environmental protection
>
> CAUTION!G 012 A8D A1 must NEVER be mixed with any other coolant. Engine
> damage will result! G 012 A8D A1 is red in color. The mixture of G 012
> A8D A1 and other colored coolants is immediately identifiable by
> discoloration (brown, purple etc.). If this mixture is used in an
> engine, a foamy deposit will appear in the expansion tank/radiator. This
> mixture is to be
> drained immediately and the cooling system flushed as described
> below.
>
> Flushing procedure :Engine at operating temperature (older vehicles
> (like ours) with heater valve: heater on). Drain coolant (lower right
> side (left side -facing) corner of the rad (belly pan off) Attach hose
> to nipple . Apply
> compressed air to expansion tank or radiator to blow out remaining
> coolant. Close cooling system, fill with distilled water. Run engine for
> a minimum of 2 minutes. Drain water and apply compressed Air to
> expansion tank a before close cooling system and fill with appropriate
> mixture ratio of G 012 A8D A1and distilled water. Test drive, check
> coolant level and add if necessary. Note:G 012 A8D 01 coolant may be
> used in older
> vehicles when the original coolant is drained and cooling system
> flushed as described above. Inform customer that a new coolant Is used
> and that ONLY water or G 012 A8D A1 be used to replenish. CAUTION! Never
> re-use old coolant when performing
> engine repairs.Dispose of old coolant properly. Flushing as specified
> above, or engine damage resulting from the use of a mixture of G 012 A8D
> A1 and other coolants is not covered by the
> new vehicle warranty
>
> Reference:  http://gti-vr6.net/library/engine/blue_or_red_coolant.html
>