[urq] Gurgling noise in cabin...

[urq]

... as discussed back then, those "turbulence generators" are there in most
heat exchangers (including many home water heaters) to improve heat transfer
efficiency.  The flip side is that they could well provide places for
bubbles to live too.  

While the heater core in the urq is quite a bit lower than the T44 (it sits
very close to the transmission tunnel in the console), the idea of making
the top of the radiator the place air wants to go by raising the nose is
still a good one.  To focus on getting air out of the heater core you might
even think about jacking up the right side of the car to get any trapped air
to move to the outlet ... 

If you still hear gurgling noises at that point you might want to consider
pulling the core out of the console and holding it vertically and filling it
with distilled water, to ensure all the air is removed.  The water will be
less viscous than coolant ... it would probably be best to do this with the
hoses attached to make sure no air gets in when re-installing.  Definitely a
PITA, and certainly not anything I had to do when I did my heater core ... 

Steve Buchholz

-----Original Message-----

As I mentioned before, trying it on an incline may help.  Don't have the UrQ
in front of me but I'd be surprised if the core was the system high spot, of
course putting on ramps etc would gaurantee that it is not. From my posts
this summer having my replacement core making mystery rattling sounds I
found that the coolant tubes (original to) contain wavy aluminum "turbulence
generators"? that I assume are to help alleviate a "known" issue.  As a last
resort I'd think it fairly straight foward to prime the core using 100%
water, in case of spillage then balance the mix in the system elsewhere.
 
> From: laraa at sympatico.ca
> To: audi at humanspeakers.com; brett.dikeman at gmail.com
 
> Yes, really ? 
> 
> Interesting, since each time I had to purge coolant in the past, the nose
of
> the car was on the ramps to get access to the bottom of the rad. The last
> time, it was flat on the ground, and it was the first time that the heater
> core was emptied completely. 
> 
> Good suggestion.
> 
> Louis-Alain
> 
> -----Message d'origine-----
> De : Huw Powell [mailto:audi at humanspeakers.com] 

> Haven't "we" discovered that the type 44 needs its nose raised a bit 
> when swapping coolant, in order to get all the air out? Forgive me if 
> wrong chassis, etc.
>