Hose Trans cooler on 1967 Avanti II

[Dick M]

Last fall I purchased a 1967 Avanti II.  I had to replace the air intake heater core control cable (bowden cable).  In the process of routing the cable above the AC evaporator, I noticed that the "Hose trans cooler" on the passenger side had corroded and deteriorated to the point that it really was totally gone (just pieces).  I looked at the parts catalog, and found the attached graphic (shown as 2138-65) .  It really does not indicate where it connects at the top of the dash.  Before I dig deeper into the dash and console, I have several questions.  Where does it get the 'fresh air' from?  Are there any better pictures or drawings showing the connections?  I know it says it is a trans cooler hose, but is it just a convective air flow cooling system?  What are the consequences/risks of not replacing the hoses (left and right)?  If anyone has replaced these, any advice on the process would be appreciated.  By the way, it has a GM 3 speed automatic transmission.

Edited 4 hours ago by Dick M