Oil-water heat exchangers can leak due to both temperature and pressure. The
Leaks can also be so small they can't readily be detected. What method are
you planning? I would test the coolant side (easiest to connect to) by
applying shop air and submerging the unit and look for bubbles. After it is
installed and running have oil test performed on the ATF. They will detect
if any antifreeze is getting in there. For the engine oil cooler since the
engine oil pressure is higher than the cooling system pressure a failure
shows as oil in the coolant.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
aka.bugle
Sent: Friday, October 12, 2012 8:55 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Re: Larger Audi a/t cooler fits transporter

Sweet!
Do we all agree that 30psi is sufficient to test the water side of these
coolers?

On Fri, Oct 12, 2012 at 8:04 PM, Dennis Haynes
<d23haynes57@hotmail.com>wrote:

> Yes the larger cooler should work better. Most of the heat is
> generated in the torque converter and it does a great job cooling
> itself with those attached  fins. The water to oil cooling approach is
> a bit of an interesting set up. For the most part the transmission
> cooler is in parallel with the radiator. The coolant going to it is
> the same as that going into the radiator. It is the flow (volume) that
> determines the cooling capacity and when underway (radiator has
> sufficient air flow) the coolant flow will be dependent on load and
> speed. Higher load = more cooling!
>
> Dennis
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On
> Behalf Of aka.bugle
> Sent: Friday, October 12, 2012 6:06 PM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Larger Audi a/t cooler fits transporter
>
> Have to pressure test it... but it fits well and is about 3/4" thicker...
> so must be better at cooling eh?
> part # 087.409.061E
>
> --
> Best Regards,
>                           ~david
>
>

--
Best Regards,
                          ~david