So I was finaly able to pull out the heat exchanger unit. I took it apart and tested the core. It was leaking pretty badly. So much for hoping it was a simple bad connection.
The core measures 2 x 6 x 16 and has the in and out connections on one end.
I am trying to stay with OEM because the original fan is three speed and the wiring is set up that way.
A part number from BCS Google's out to a transformer.
Looking for suggestions since Burke and Carillo dont have anything .
Thanks