Radiator Rx?

[Rambini50Ra]

Hey People,
Having some heat from my '89 Ram 50 2.6L.
Flushed myself block & rad and new thermostat.
After a year running hotter, not pegged. Fan clutch feels wimpy,not easy to physically lock up. Crusty, flaky on top of rad tubes. Some coolant loss, no sign in eng oil.
So, a flush with citric or cascade? Load & higher ambient temps seem to affect the temp. Any clear route for a new rad once I rule out the outside variables? Thank you all.

[Law Dog]

Check you radiator cap they can play some screwy games.

[xboxrox]

If not done yet try:

Prestone (or any good brand) cooling system FLUSH
Use 50/50 premix coolant ALWAYS (it's made with distilled water & the correct 50/50 mixture cannot ever be screwed up) unless you use..?
Check ignition timing too advanced will cause overheating
Hold a piece of stiff cardboard against the fan blade with engine at idle ~ if the blade can be stopped then the fan clutch is NO GOOD
Try to avoid aluminum & plastic radiators

Good Luck