[Biturbos4] Strange loss of coolant

[Geraldo Candelas]

Yeah man if you cannot find a crust residue leak at any hose or at the bestie hose inlet/outlets then i would say that either 1 of your fans is not working or the coolant reservoir cap is not holding the pressure and allowed coolant to pass over to the vent tube

Sent from my iPhone6+

> On Jun 30, 2016, at 5:48 AM, Andrew Lundy <fast4cefed at gmail.com> wrote:
> 
> Sounds like the car got hot to me and the coolant reservoir overflowed.
> 
> I don't know the details of your drive that day. But if you sat in traffic
> for a while or got stuck at a bunch of stop lights with the high temps, the
> temp could have went up in the car and started to overflow.
> 
> When this happens it is a sign that one (or both) of your electric cooling
> fans is dying. At speed the car will stay cool...but stopped it will warm
> up. If the fan is just starting to die it may only happen on hot
> days....but it will slowly get worse and happen on cooler days too. This is
> pretty common...BTDT.
> 
> Another possibility is a bad cap on the reservoir that couldn't hold the
> excess pressure on the hot day. This is possible, but not as common on
> these cars.
> 
> Good luck!
>> On Jun 30, 2016 3:22 AM, "Ti Kan" <ti at amb.org> wrote:
>> 
>> Hi folks,
>> 
>> My 2001.5 S4 did something weird that I cannot explain, maybe
>> someone out there would have an idea what happened.
>> 
>> A few days ago I drove home as usual, the car ran fine without
>> any signs of trouble.  It was a very hot day so I had my A/C
>> running.  Upon arrival, I parked it outside, and noticed a small
>> trail of water behind the car.  It didn't concern me at the
>> time, thinking that it was just condensation from the A/C.
>> 
>> About 3 hours later I leave to go run an errand.  As soon as
>> I started the car, the auto-check system displayed the big
>> "low coolant" warning symbol.  I shut off the car to check
>> under the hood.  Sure enough, the coolant reservoir was dry.
>> I had checked the level recently, so this is not due to a
>> slow leak.  However, looking around underhood, I cannot see
>> an obvious place where the leak might be.  The first thing
>> that comes to mind was hoses, the expansion tank, or the
>> expansion tank cap.  There was no sign of coolant or wetness
>> anywhere that I could see, except on a small hose that runs
>> from the fuel pressure regulator to the intake manifold.  The
>> hose looks like a vacuum hose to me, it has a woven cloth
>> exterior, but it was wet.  I don't think the hose itself was
>> the culprit, but perhaps the coolant leaked from something
>> and got this hose wet.
>> 
>> I also examined the radiator area, the heater hoses, the
>> plenum area where the heater hoses go to the heater core.
>> I also checked the interior floor carpet... all dry.  There
>> was no musty smell in the cabin.
>> 
>> Hmm.  OK, so I refilled the expansion tank back to the proper
>> level with distilled water and G12 coolant mix.  The total
>> amount I had to pour in was a little over 1/3 gallon water
>> and the same amount of G12, making it 2/3 gallons total.
>> The cooling system capacity was not listed in the owners manual,
>> so I searched for it on the net, and found it to be 1.58 gallon.
>> This means that the system lost 2/3 gallons, but still had about
>> 0.9 gallons in it.
>> 
>> That's enough coolant loss, more than what would only get a
>> small hose wet.  I dried that hsoe with a paper towel just to
>> see if it gets wet again.
>> 
>> I drove the car for 2 days now, and the coolant level
>> is staying pretty much where I filled it.  I don't see any
>> signs of leak, no puddle under the car, no trail of water behind
>> the car.  It seems as if the problem cured itself.  That small
>> hose feels a little damp.  I'm not sure if it's new leak
>> or it's still coolant from before.  The cloth texture of
>> the hose seem to retain some water even after I wiped it.
>> 
>> I am still baffled about this, and carry distilled water and
>> G12 in the trunk just in case, but what could cause an apparent
>> big loss of coolant and then act as if it never happened?
>> 
>> Sorry about the long post.
>> 
>> -Ti
>> --
>> 2003 A4 1.8T
>> 2001.5 S4 2.7T
>> 1984 5000S turbo
>> 1980 4000 2.0
>> 
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