"old coolant is terribly corrosive"

come on now, how is coolant that is not circulated any older than the stuff that is circulated. I call bull-pucky. 

alistair

On 2012-11-18, at 1:50 PM, Scott Daniel - Turbovans wrote:

> There is no 'control knob' ..
> there is a lever that you can reach with your fingers, through a hole in
> the rear heater cover.
> 
> if the cover is not in place...the poster could be looking at a
> knob-like thing ..the bleed valve.
> 
> Bentley would not say much about this leverthat regulates coolant flow .
> but the van's Owner's Manual sure does.
> 
> 'Forward' on the lever is 'on'.
> Aftward is off.
> 
> I recommend having it at least mostly 'on' all year ..
> as having no flow at all, ever, or for very long periods ,  contributes
> to rear heater core leaking ..
> a pretty common thing actually. .
> 
> Whether warm air comes out the rear heater is determined by the fan for
> the rear heater being on or not, or course.
> 
> you always want at least some coolant flowing through the rear heater so
> some fresh healthier coolant is always going through it ...the parts
> last longer that way.  Old coolant is terribly corrosive.
> 
> Nobody on this list of course...
> there are lots of vanagon owners that don't know about the heater
> control lever under the back seat.
> I was kinda shocked actually to find out VW did it that way.
> I can't think of one other car that has a partially heater control under
> the back seat.
> 
> 
> 
> On 11/18/2012 11:49 AM, Dave Mcneely wrote:
>> Harry, that control allows coolant to circulate through the heater core.  Summer, off, winter, on.  To control air flow, use the knob on the dash.  mcneely
>> 
>> ---- Harry Hoffman <hhoffman@IP-SOLUTIONS.NET> wrote:
>>> Hi all,
>> The heater under the rear seat has a control knob.
>> Can someone tell me what it does? The Bentley only shows a picture but not how it functions.
>> 
>>  Cheers,
>> Harry
>> 
>> --
>> David McNeely
>>