NO RECIRCULATE

recirculate is for a load of rotting fish.

https://www.google.com/search?site=i...k1.gjR2pH0hJY0

more air moving over an operating exchanger gives cooler temps...otherwise the system needs repair.

try wiring the fan directly to the battery with a relay. prob the ground side.

first check for leaks in the output side n close down vents not needed.