[Biturbos4] B5 S4 heater core clogged

[cH3Wy]

Heya man

Ok first I would recommend you try flushing with water bc it very well could fix your problem. Worse case scenario it clogs more or you get a leak. Either way if those 2 happen then you have a bad heater core you'll have to change it anyhow. Right next to your battery is a black loom. Remove loom and it exposes the heater core hoses for supply and return. Go to hardware store and buy some feet of I think 3/8 hose(don't trust me on that but measure the ones on there). Also buy a fireman nozzle for your water hose like this http://www.ecvv.com/product/766405.html

Disconnect the heater core hoses. Coolant should come out. Connect that hose you bought to one of the pipes and put that hose into a bucket. Then put your fireman hose in the other pipe and first start water slow then gradually increase(do not go full blast because you can damage heater core). Once water runs clear swap and do the same thing to other side going the other way. 

Hope it fixes your issue. 

Sent from my iPhone5S

> On Dec 26, 2013, at 11:03 AM, Ti Kan <ti at amb.org> wrote:
> 
> Hi all,
> 
> The heater core on my 2001 S4 appears to be clogged, there is
> very little heat out of any vent even with the engine fully hot
> and the climate control temp set to HI.  The blower is working
> properly, all air flaps seem to work too.
> 
> Replacing the heater core is a BIG job on this car, involving
> the removal of the center console, entire dashboard, and many
> things beneath it.  I don't have the time or the confidence
> that I could do this myself, and paying a shop to do it will
> be serious $$$.
> 
> I read that a heater core can often be un-clogged by backflushing
> with either compressed air or water.  My mechanic is reserved
> about this method, saying that there is high chance that it
> would cause the heater core to spring a leak into the cabin,
> which would _force_ a replacement of the heater core.
> 
> What is your opinion about this?  Should I try to backflush it?
> If so which is better, compressed air or water?  Just how sturdy
> are these heater cores?  According to the family album the same
> heater core is used on all B3, B4 and B5 Audis as well as the
> B5 Passat.
> 
> -Ti
> 
> 
> 
> 
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