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

James Whitehouse james_whitehouse1 at yahoo.co.uk
Wed Sep 6 16:39:34 EDT 2006 

Brian,

 

That’s a good point. I’ll do a cold start and heat up again monitoring it
carefully to see if it was just that once or if it always does that
full/half heat thing every time. If not I guess I’ll replace the rad. It was
my mechanic who said they used plastic impellers, personally I thought they
were metal on this model too…

 

Cheers,

James

 

   _____  

From: Brian O'Neill [mailto:briano_72 at yahoo.com] 
Sent: 06 September 2006 21:36
To: James Whitehouse
Subject: Re: [V6-12v] Radiator Fans not switching in correctly...

 

i dont think any audis had plastic impellers, only beemers did, and they
changed back to metal after seeing the light. does it do the full heat/half
heat everytime on cold startup ?? that is the thing you need to figure out.
if it does, its a t-stat. if not, its a blocked rad, whatever is in there,
if anything, can and will move around. water flow can move it to an area
that it cannot pass thew and block the flow. 

                                                           brian o'


James Whitehouse <james_whitehouse1 at yahoo.co.uk> wrote:

Yeah, it is a bit of a puzzler. I did read something recently about plastic
impeller parts on the water pump breaking off and blocking things, but it's
a bit of a puzzle. I'm still wondering if the thermostat isn't a likely
culprit...

Cheers,
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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