Re: Overheating... another thread. (first one bounced)

[Brian McGarvey <brianm@zbt62.eastnet.gatech.edu>]

Allyn + list.
I didnt *want* to let it get that High. I was stuck in atlanta traffic
where there were *NO* exits to pull off at. I had all the widows and
sunroof open w. the heat going full blast. I am now *very* careful about
the times around Atlanta when I drive.

History. I didnt replace the water pump just for preventative maint. Prior
to I was running hot, I only got to drive it a tiny bit, but I suspect it
was doing the same prior too. *Now* I know why the PO really wanted to get
rid or it. He couldnt drive it at night (euro lights not relayed) or
during the day with traffic.

My plan.
#1
Replace the fan switch w. a 160 degree fan switch.
FLush the system w/ a flush type cleaner (add to it any recommedations).
Use burping method. Might try w/out a thermostat for a while.

#2
The bently says that the LOWER rad hose can collapse causing overheating.
Being ordered from potterman ASAP. Also I will not drive it in traffic,
until this is rectified.

#3
Failing all this I WILL get my RAD redone.


Question.
what are the drawbacks other than NO heat to running without a thermostat
in this engine. I have done it in many other cars w/out a problem.

#4
Dunno...
head gasket maybe + screwdriver for water passages.

brian
perplexed.



On Thu, 7 Jun 2001, Allyn wrote:

> brian + list,
>     same is happening to mine. same exact symptoms on the temps, 110 on hwy,
> 120 when on it. i havent let it hit that 135 mark, highest i've seen it is
> 120 at an idle. i refuse to let it go much higher as that was the end cause
> of rings going on my 88 16v back in 94 (in the middle of a road trip, arg).
> i've done the same as brian, even more i think. water pump, thermostat (also
> did holes), radiator flush, 60/40 antifreeze/h2o, etc. the flush did drop it
> some but not alot, and it will still climb up there at an extended idle,
> given the chance.
>     whats funny is that my other 16v (the one i yanked the motor from before
> it went to the yard), ran extremely cool, just like my original 88 16v did.
> it would run at 90-100 oil temp driving, go to 110 at idle. water temp would
> go up 3/4 and down to 1/2 when the fan kicked on. also it wouldnt break 1/2
> temp at idle with the a/c on (low speed fan could keep it there easily). on
> top of all of this, both of those cars were driven in tampa, FL in the
> summer!
>     i believe in the end that our problem lies in tuning. not necessarily
> just timing, but mixture and o2 sensor. i have a feeling that either our
> mixture drifts over time (to explain hot while driving), and possibly our o2
> sensor drifts in a certain direction over its lifetime, adding to the hot
> idle. a well tuned engine should run damn cool, and i think slight drifts,
> combined with our crazy compression ratios, all adds up to cause us pain.
> lemme know what you guys think
> al
>
> Allyn Malventano, ET1(SS), USN
> 87 rocco 16v (rieger gto - green - 'der rocco' - restoration in progress)
> 87 jetta 8v wolfsburg 2dr (260k, still tight :)
>
>
> ----- Original Message -----
> From: "Brian McGarvey" <brianm@zbt62.eastnet.gatech.edu>
> To: <scirocco-l@scirocco.org>
> Sent: Thursday, June 07, 2001 11:45 AM
> Subject: Overheating... another thread. (first one bounced)
>
>
> > Hey Ya'll.
> >
> > I got stuck in traffic today and my rocc (87 16v) nearly overheated. It
> > would have If I hadnt cranked the heat on full blast (3 resistor is
> > hosed).
> >
> > symptoms.
> > at idle it jumps from normal op temp to the dot just below the overheat
> > line (not the led) oil temp got to about 135C noramlly 110C when driving
> > faster. If I hot rod the car even at hwy speeds the temp jumps to 120C+
> > and the water temp rises.
> >
> > Things done to date.
> > R&R water pump
> > R&R thermostat (drilled 2 little holes)
> > R&R all belts.
> >
> > drainded old std green anti-freeze
> > put new anti freeze in (upper rad hose) std green stuff.
> >
> > system burped once. dropped temp a little the other day a cincy ( had a
> > great time)
> >
> > Things on the todo list.
> > change out fan switch w/ 160 degree 3 pole swtch
> > pn 8.170.03 fan switch 3 pole.
> >
> > change out antifreeze w/ water wetter.
> >
> > If none of these things work I'm left with the following options.
> > #1 radiator is stopped up. and needs flushing.
> > #2 the motor is stopped up and needs flushing.
> > #3 new thermostat is foobar. not unheard of but unlikely.
> >
> > any suggestions of flushing the system?
> >
> > brian
> > 87 16v all the cool mods gotta wait till it runs good.
> >
> >
> >
> > --
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> >
>
>


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