182 Cup
Gonna do this on Saturday, how would one do it properly?
If it's as simple as a Mk1...
Undo the bottom hose into/out of the radiator.
Pull it away from the rad so all the fluid pisses out everywhere, preferably into a bucket as you're not supposed to let it go into the drains.
When it stops coming out, refit the pipe and top up the system from the header tank, using the correct coolant at the correct mixture (if you don't get the premixed stuff).
When it's up to the top mark, start the car with the bleed screw out of the top of the rad and the header tank cap off.
When just coolant (and no air) comes out of the bleed screw hole, do it up again and put the top back on the header tank.
Should then be job done...