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

James Whitehouse james_whitehouse1 at yahoo.co.uk
Wed Sep 6 16:19:29 EDT 2006

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


> -----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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