What do you mean by "rad"? Radiator? Radio? Which year?
The radiator in the classic 900 (1979-93) is easy to replace. Should take only about an hour.
1) Remove hood. Drain coolant (drain petcock is on the right side).
2) Remove upper and lower hoses to radiator
3) Remove ignition coil attached at top of radiator
4) Remove two bolts at top of radiator
5) Lift radiator out.
6) Install new or rebuilt radiator.
7) Fill with new anti-freeze/coolant.
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