The feed line to the cooler comes from the back of the engine, close to the firewall, either from the engine block or from the cylinder head. I am going from memory as my D24T car is 300 km away at present. there are 2 fittings at the back there as the other one goes to the heater on the firewall.
This leads to a steel tube which fits between the intake manifold and the valve cover and then drops down to the cooler near the alternator to the filter/oil cooler. The return line then runs up above the filter, across the top of the valve cover near the front of the engine and then ties into the fittings down by the thermostat housing at a tee where the return from the heater and cold start thermostat enter.
In a few days I can take some photos if you need them.
Steve
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