Date: Wed, 15 Jun 2011 10:57:05 -0700
Reply-To: Wes Neuenschwander <wes.neuenschwander@COMCAST.NET>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Wes Neuenschwander <wes.neuenschwander@COMCAST.NET>
Subject: Botched Coolant Flush Implications?
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I recently had the coolant system flushed and coolant replaced in my '91
Westy at a local independent VW service place. I have about 15,000 miles on
my rebuilt (GoWesty 2.3 liter) engine. When I got the vehicle back, the
coolant in the reservoir (non-pressurized tank) was at the 'full' line.
After driving the vehicle about 100 miles, I noticed the heater didn't seem
to be heating fully. After I opened the heater valve 100% for a few miles,
the heater function seemed to be restored, providing well modulated heating
over the full range of the heater valve settings. Engine temperature - or
rather coolant temperature - was normal the entire trip (consistently
mid-point on the coolant temp gauge, just as before the coolant flush).
However when I got home from the trip (about 500 miles, including some NW
Washington mountain passes, I noticed that the reservoir was empty (didn't
check the pressurized tank, alas). I refilled the reservoir and after
running the engine a few times during short day trips around town, both the
reservoir and pressurized tank levels are normal (pressurized tank is full
and the reservoir is at the mid-full mark).
There is no evidence of leaking coolant - anywhere. My guess is that the
air was not fully purged from the coolant system following the flush/refill
operation (perhaps, at least in part, due to air trapped in the heater lines
and/or heater core).
Two questions:
1) What do I need to do (if anything) to ensure the system is fully
purged now?
2) What possible adverse effects might there have been from having an
incompletely purged coolant system on a drive like this (including some
full-throttle periods over the mountain passes)? In particular, of course,
is it likely that I might have damaged or otherwise compromised those
infamous waterboxer cylinder heads??
Also, a corollary question: I clearly specified that the replacement
antifreeze must be Volkswagen brand only (in the past, I've had shops use
'house brand' coolants - i.e. whatever the local tech/guru thought was
best). How can I verify that the antifreeze used was genuine VW and not
some off-brand?
-Wes
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