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

[James Whitehouse]

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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> >
> >
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