[V8] Heater Core Question

Thu Sep 15 19:21:14 EDT 2005

Nathan,
The reservoir is recent. Check the book.  As to the heater core, I doubt
that would make the pop on failure.  I'd bet the failure is the rubber from
the firewall to the core.  It is probably original.  I had not replaced it.
Replacement of rubber is a lot easier than the core, too.
Roland

Roland Broberg
Broberg Engineering-BECO
Delafield. Wisconsin USA
----- Original Message ----- 
From: "Klein, Nathan P" <nathan.p.klein at lmco.com>
To: "Ingo Rautenberg" <i.rautenberg at waratap.com>; <dsaad at icehouse.net>;
<v8 at audifans.com>
Sent: Thursday, September 15, 2005 11:21 AM
Subject: Re: [V8] Heater Core Question

> After this happened, I discovered that there was a crack in the
> reservoir cap, along with a bad seal, allowing steam and pressure to
> escape.
>
> Could this have been the culprit that has caused so many overheating
> problems?
>
> So a new cap is a must-have.  The reservoir looks good - but should I
> replace it anyway after such a cooling system meltdown?
>
> And -- I think the radiator is okay - before this happened, I was
> running about 90C on the open road, even with a cracked reservoir cap,
> so I think it's functioning effectively.
>
> Nevertheless - is there an easy (relatively speaking) way to clean out
> the radiator?
>
> -----Original Message-----
> From: Ingo Rautenberg [mailto:i.rautenberg at waratap.com]
> Sent: Thursday, September 15, 2005 11:16 AM
> To: Klein, Nathan P; dsaad at icehouse.net; v8 at audifans.com
> Subject: Re: [V8] Heater Core Question
>
> Make sure you don't need a radiator as well.  Inferior cooling will
> cause the parts of least resistance to self-destruct including heater
> control valve and heater core.  If you're currently bypassing the heater
> core and all is OK, then you should be good.  Otherwise, fix whatever
> the main problem is before doing the heater core -- no need to do it
> again.
>
> ----- Original Message -----
> From: "Klein, Nathan P" <nathan.p.klein at lmco.com>
> To: <dsaad at icehouse.net>; <v8 at audifans.com>
> Sent: Thursday, September 15, 2005 12:05 PM
> Subject: Re: [V8] Heater Core Question
>
>
> > I don't know for sure if it's bad or not.
> >
> > I'm just guessing that it's the heater core at the moment.
> >
> > I've had a ton of overheating problems.  One day, the water temp got
> up
> > to 120+ C (gauge was all the way over), I heard a loud "POW!" from
> > behind the dash, and smoke started billowing from the A/C and defrost
> > ducts.  Actually, you could smell antifreeze out of the A/C vents for
> a
> > few days before this happened, especially if it was rainy or humid.
> >
> > I haven't done the tear-down yet. So what would be the best way to
> tell
> > that it is in fact a bad core?
> >
> > Sourced a new core locally for fifty bucks.  Don't think that it's
> OEM,
> > so thanks for the pointers.  :)
> >
> > -----Original Message-----
> > From: v8-bounces at audifans.com [mailto:v8-bounces at audifans.com] On
> Behalf
> > Of dsaad at icehouse.net
> > Sent: Thursday, September 15, 2005 10:09 AM
> > To: v8 at audifans.com
> > Subject: Re: [V8] Heater Core Question
> >
> > I just went through "heater core heck"
> >
> > Here is what I learned:
> >
> > Make sure it is bad. My problem in the end turned out to be a loose
> hose
> > connection from the valve to the core. My OEM core is still good but I
> > did not discover this until after the following:
> >
> > First I tried an all metal (brass) core. It did not fit too well, and
> it
> > actually failed after a few months. It developed a leak in the core. I
> > think this has to do with the fact it was brass, and electrolisys ate
> it
> > up. In fact, there was a warning in the box that said this could
> happen.
> > Go figure.
> >
> > Next I tried the aftermarket plastic/aluminium unit. It is still in
> > there - but it stunk like crazy for months (by this I mean your eys
> > would water and you had to open the windows). Some sort of toxic junk
> on
> > it I suppose (it was made in China after all). It seems to be mostly
> OK
> > now, which is good with winter comeing on.
> >
> > So - OEM is of course best but way expensive.
> > Stay away from the brass.
> > If you get the made in China unit (likely) clean it off with solvent
> > before you put it in the car.
> >
> >
> > Dave
> >
> > Quoting "Klein, Nathan P" <nathan.p.klein at lmco.com>:
> >
> > > Hey y'all,
> > >
> > > My partially severed finger is pretty much healed, so I'm going to
> try
> >
> > > to find out what's up with the heater core this weekend.
> > >
> > > I think this has already been answered, but I wanted to confirm
> before
> >
> > > I order the part:
> > >
> > > Is the heater core on the V8 interchangeable with the 100?  Any
> other
> > > VAG cross-compatibility?
> > >
> > > There aren't many V8s down here (I've only seen one other in
> > > Dallas-Fort Worth), so parts guys aren't too familiar with 'em.
> > >
> > > Thanks!
> > > Nathan
> > >
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