[Biturbos4] Strange loss of coolant

[Ti Kan]

It's on the "crossover pipe" behind the engine, which straddles
between the two cylinder heads.  There are two coolant temperature
sensors, one is for the coolant temp gauge, the other is for the
after-run fan/pump.  I don't know if the 2.8s have the same
sensors, but both of these have an o-ring on it.  There is a plastic
U-shaped retainer piece that keeps the sensor in place.  Pull that
out sideways and the sensor can then be pulled out.

-Ti

On Wed, Jul 20, 2016 at 02:20:44PM +0000, Brandon Rogers wrote:
> Thanks for following up Ti - my wife's Passat is losing coolant, too - and I haven't been able to find the source.  Was it the temp sensor on the back of the motor? Or?
> 
> Brandon
> '00 S4
> '91 911 Turbo
> 
> 
>  
> -----Original Message-----
> From: Biturbos4 [mailto:biturbos4-bounces at www.audifans.com] On Behalf Of Ti Kan
> Sent: Wednesday, July 20, 2016 2:36 AM
> To: quattro at audifans.com; biturboS4 at audifans.com
> Subject: Re: [Biturbos4] Strange loss of coolant
> 
> Thanks for all the comments, here is an update.
> 
> My coolant leak is fixed!  And it's an amazingly small repair.
> Turns out the o-ring for one of the coolant thermal sensors was leaking, but not bad enough to do so all the time.  Only when the car is running hot would it begin to leak.
> 
> So, all that was needed was to replace that o-ring.  Also, one of the coolant reservoid hoses was showing a small bit of G12 crud at the end.  Rather than replacing the hose, simply cutting the hose end a little and reinstalling it did the trick.
> 
> Nothing expensive broke!  Thank goodness. :)
> 
> -Ti
> --
> 2003 A4 1.8T
> 2001.5 S4 2.7T
> 1984 5000 turbo
> 1980 4000 2.0
> 
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