Coolent system upgrade questions

[ats at longcoeur.com (ATS - Patrick Bureau)]

Well you can flush the system with water then run the "orange" stuff, but I
don't see why you will get better temperature from a system designed for the
green stuff, that worked for years, and now overheats.

Your question is, "Why is my system overheating".
The type of "coolant" you are using is irrelevant to the issue at hand.

I have read all the replies to the original message, and I think Allyn has
good points, check the Thermostat (you know, boil some water in a dish on
the stove and dip on a string the thermostat to see if it opens/closes),
Flush radiator (though I recall you mentioning it is new), Flush the engine
is another good one.

I would do a trial run after replacing your thermostat, by simply using
straight water with water wetter or 20% mix and see if the car overheats
again: 

If it does not, you now know you solved your problem (water is cheap, that
orange stuff is not especially for a test!)

If it does, then you know it is something else than your thermostat;

1. Could be corroded passages that are partially blocked in the engine/head
preventing proper flow, (I have experienced this on the metallic return
tube, corrosion settles nicely in it because of the low speed flow and
diameter of the tube (it's the one running from the water bottle to the
water pump!)

2. Could also be a tired water pump that is just not out-putting the proper
amount of pressure and the system is flowing too slowly 

3. Also test this with the interior Heat on (additional circulation) if the
temperature drops once you open the heat to on, then you have a circulation
issue.(head by-passes through the interior heater to the return line), which
could point to a clogged flange or oil-cooler exchanger issue.

Cheers, and keeping an open mind in troubleshooting is as much important as
understanding how the "circuit" of the system you are troubleshooting .

--------------------------------------
ATS - Patrick Bureau - Canuck in Texas
ATS A1 Parts on ebay - http://tinyurl.com/22e5b


-----Original Message-----
From: scirocco-l-bounces@scirocco.org
[mailto:scirocco-l-bounces@scirocco.org] On Behalf Of calimus
Sent: Saturday, June 19, 2004 1:47 PM
To: Scirocco-l
Subject: Coolent system upgrade questions

Ok, so temps in the rocco still arn't what they used to be so it's time ot
take things a step further.

What I picked up
160F t-stat
2gal of VW "Orange" coolent  (dats some exspensive shit)
16v passat dual radiator fan + new belt

SO I'm sure you see where this is going.  Things I'm unsure of: How the hell
to mount the dual fan system to a scirocco 16v w/AC radiator.  It certainly
doesn't line up with anything and I knew it wouldn't.  But al also know that
some of you folks run this system and have solutions.  Now I'd like to have
a good solution, I already tossed out the zip tie idea as I'm shooting for a
much cleaner look.  So anything not involving zip ties is more then welcome.

Now, I'd also like some validation for why I bought the orange coolent.
I've had a few different folks tell me it's what I should use, though non
were technical enough to give me good reasons other then "it's whats in my
jetta/passat/golf".  So is there anything different between the orange stuff
and your average everyday prestone coolent?

Ok, while I await all the answers, I'm gonna go drain my damn coolent system
for the 3rd time this year in hopes of cooling this thing off since I'm
pretty sure it's the t-stat now.  But I'm always looking for ways to make
her run cooler.

William Snyder

88' Scirocco 16v
89' Cabriolet 8v
71' Karmann Ghia



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