you dont have to bleed a D1?

 

Yes but the only bleed screw is on the top of the radiator and it is brass.

The cooling system on a DI is simple, upper hose, lower hose, 2 heater hoses, thats it.

No "T"'s, no funky 3 pronged thermostat, nothing special, just a 3 core radiator (the DII has a 2 core), oil cooler, trans cooler, 2 electric fans and the clutch fan.
And the thermostat is on the engine the way God intended.

 

well you can buy a brass one for the DII but I agree the DII coolant system is more complicated than it needs to be.

 

$5 for the bleed screw and $8.50 for shipping