G37 Oil Cooler & Transmission Cooler

The wires for the oil and trans temp were routed through the firewall using a factory wire path. The wires to power the gauges were soldered to the factory wires in the ashtray area and heat shrinked to prevent any future problems with chintzy clip on style connectors. The final step in the process was routing the oil temperature sender wire from the firewall to the temperature sender.  We had half of the work done already with our transmission temperature gauge install. In the passenger footwell, past the blower motors for the climate control, there’s a sealed firewall pass through we utilized that exits out at the battery location in the engine compartment.  From there the transmission temp wire splits off on its own path towards the back side of the engine compartment and the oil temp wire continues towards the front of the car where the oil cooler is located. Both sets of wires were wrapped in wire-loom and routed mimicking other factory wiring routes and secured with zip ties.

Pictured is the shiny new wire loom line routed down to the transmission temp gauge. Not pictured is the line we ran down past the battery towards the front of the car for the oil temperature gauge. We put these wires in wire loom as well.
Louie cuts a small hole on the back of our pillar pod to route the wires. We’re using wire loom and electric tape for a clean install at the back of the gauge pod.
Back to the oily stuff, here’s the fittings and routing for the Stillen transmission cooler. The system works in line with the factory transmission cooler located in the radiator. The exit line goes from the trans cooler in the radiator and hooked up to the inlet line of the new Stillen cooler and the return line from the Stillen cooler is fed back to the transmission.
Here’s all the fittings for the oil cooler. This includes the Goodridge lines for the thermostatic sandwich plate adapter supplied by Stillen and the Earl’s fittings we used to hook in for our Autometer temperature sender. The trick for the temperature sender was a T 1/8″ npt fitting from Ace Hardware and we blocked off the side of the T we didn’t need. All the ends are sealed with teflon paste and we triple checked for any oil leaks.

1 comment

  1. It’s a very helpful blog to know how to cooler engine oil and transmission fluid works. thanks for explaining.

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