If you look up from underneath the radiator you should see some holes in the skidplate directly beneath the radiator endtank. One of those gives access to a white plastic wing nut that lets you drain the radiator when you loosen it counterclockwise. Once that's open you can open the radiator cap so the coolant will come out faster.

Milan
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'98 4R Limited
'82 Toy 4.3 TBI sold