Properly the external trans cooler should be seen fro the engine bay generally. I'm old skool when it comes to car trans as it's confirmed to deliver much better cooling translating to smoother change & extended lifespan. I've it Outfitted in all my car cars and trucks Pemilik Proton X70 https://marcosekpu.tinyblogging.com/a-review-of-x50-gearbox-77926702