[V6-12v] Radiator Fans not switching in correctly...

Wed Sep 6 19:02:27 EDT 2006

Hi Austin,

Thanks, the car has been very slow getting up to temp in the last few
months, so I wonder if that could be a potential problem. I had just thought
the thermostat was getting dodgy, but perhaps the thermostat is a more
recent problem that's stuck closed and now causing the overheating!

Is there any way, short of replacing it, to tell whether the coolant cap is
faulty? For example, should it rattle/not rattle if you shake it, etc?!

Cheers,
James

> -----Original Message-----
> From: Austin Franklin [mailto:austin.franklin at charter.net]
> Sent: 06 September 2006 23:03
> To: James Whitehouse
> Subject: RE: [V6-12v] Radiator Fans not switching in correctly...
> 
> Hi James,
> 
> If they fail closed, they hold pressure, which will hold the thermostat
> open...which will keep the engine from reaching temperature on colder
> days.
> Been there, done that...replaced cap...back to normal.
> 
> Regards,
> 
> Austin
> 
> 
> > -----Original Message-----
> > From: v6-12v-bounces at audifans.com [mailto:v6-12v-bounces at audifans.com]On
> > Behalf Of James Whitehouse
> > Sent: Wednesday, September 06, 2006 4:34 PM
> > To: v6-12v at audifans.com
> > Subject: Re: [V6-12v] Radiator Fans not switching in correctly...
> >
> >
> > I don't suppose overheating could be affected by a faulty coolant tank
> cap
> > on these cars? Aren't they pressure release types? What happens
> > if they fail
> > closed?
> >
> > James
> >
> > > -----Original Message-----
> > > From: The CyberPoet [mailto:thecyberpoet at cyberpoet.net]
> > > Sent: 06 September 2006 21:28
> > > To: James Whitehouse
> > > Subject: Re: [V6-12v] Radiator Fans not switching in correctly...
> > >
> > > My own personal experiences with blocked radiators that weren't
> > > induced by algae (which should be the case given what you stated)
> > > were all related to metal springs on the inside of the radiator hoses
> > > (to help shape retention) rusting into smaller bit and those bits
> > > migrating into the radiator and clogging the smaller passages. But
> > > again, I don't recall the Audi (at least any of mine - 5000, 200T,
> > > 100CS) having an exposed metal springs in the inside of the hoses. ???
> > >
> > > Cheers
> > > =-= Marc
> > >
> > > On Sep 6, 2006, at 4:19 PM, James Whitehouse wrote:
> > >
> > > > Thanks Marc,
> > > >
> > > > I take it that you think it is the rad that's to blame then?
> > > >
> > > > I don't know if they ran any proper rad flush through, actually I
> > > > wasn't
> > > > really expecting them to go that far or spend that long trying to
> > > > diagnose
> > > > it - I hate to think what the labour bill will be.
> > > >
> > > > I'll run some through myself. Since I've owned the car (about four
> > > > years)
> > > > it's been treated very well and part of that has been bi-annual
> > > > coolant
> > > > drain and refill with a 50/50 G11 and distilled water, so I have to
> > > > say I'm
> > > > a little surprised the rad is blocked. On the other hand, it's a 14
> > > > year old
> > > > car now, and 10 of those years were out of my care and I don't
> > > > really know
> > > > how it was treated. Most of that was genuine Audi service years,
> > > > but who
> > > > knows how often they flush the system (probably never unless they
> have
> > > > to?)...
> > > >
> > > > James
> > > >
> > > >> -----Original Message-----
> > > >> From: The CyberPoet [mailto:thecyberpoet at cyberpoet.net]
> > > >> Sent: 06 September 2006 19:53
> > > >> To: James Whitehouse
> > > >> Subject: Re: [V6-12v] Radiator Fans not switching in correctly...
> > > >>
> > > >> Did they run any acids (Radiator flush chemicals) through the
> > > >> radiator to try to unseat the potential blockages?
> > > >>
> > > >> I don't know anything about the weather-related issues in your
> area,
> > > >> but its not uncommon for radiators here in Florida to build up an
> > > >> algae-like sludge that effectively reduces flow heavily if the
> fluids
> > > >> were not maintained correctly every year or so (ditto rust/calcium
> > > >> deposits if they don't use distilled/mineral-free water in the
> > > >> coolant-water mix). A 50%-strength white vinegar flush left to sit
> > > >> for an hour or overnight  will normally clear out both bacterial/
> > > >> mold-
> > > >> based algae-type build-up and any calcification (rinse the radiator
> > > >> out thoroughly afterwards).
> > > >>
> > > >> Yamaha sells a cleaning chemical for removing rust in motorcycle
> gas
> > > >> tanks that might be useful as a last-ditch effort before throwing
> the
> > > >> radiator away, although it's intended for use on steel and I think
> > > >> the audi's radiator is aluminum & copper/bronze. I've watched
> others
> > > >> use it as a last-ditch effort on other types of cars, primarily
> > > >> American heavy muscle cars from the early 70's (Yamaha's Fuel Tank
> > > >> Rust Remover, $14.95, Part Number ACC-FUELT-CD-KT).
> > > >>
> > > >> Just a couple thoughts.
> > > >>
> > > >> Good Luck!
> > > >> =-= Marc Glasgow
> > > >>
> > > >> --
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