A6 fluid flow direction
Thread Starter
Race Director
Joined: Sep 2007
Posts: 16,557
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From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
A6 fluid flow direction
I've done a search and found conflicting answers and the service manual is vague, so I only want an answer from someone who has first hand experience and has seen the fluid direction.
Is the top port on the radiator transmission cooler the inlet or the return line?
Is the top port on the radiator transmission cooler the inlet or the return line?
Thread Starter
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,106
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
Either way will provide more cooling, but one direction provides a more stable temperature than the other.
I was hoping for an absolute answer, so I didn't have to do personal experimentation.
Anyone?
Le Mans Master
Joined: Apr 2011
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From: Montreal
St. Jude Donor '13
I see many saying that is the correct flow, and havent seen anyone say the opposite until now. I was trying to confirm this for my cooler install also, but in the end I bypassed the rad completely so it really doesnt matter. Although the B&M cooler is marked "in and out" I spoke with B&M and they told me if its mounted with the fluid attachements up.. it doesnt matter at all. It would matter if mounted with the lines on the side only.
Thread Starter
Race Director
Joined: Sep 2007
Posts: 16,557
Likes: 2,106
From: Peoria/Phoenix AZ
C6 of Year Finalist (performance mods) 2019
I see many saying that is the correct flow, and havent seen anyone say the opposite until now. I was trying to confirm this for my cooler install also, but in the end I bypassed the rad completely so it really doesnt matter. Although the B&M cooler is marked "in and out" I spoke with B&M and they told me if its mounted with the fluid attachements up.. it doesnt matter at all. It would matter if mounted with the lines on the side only.
