1977 FJ40 check coolant level (1 Viewer)

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1977 FJ40 - how do I check coolant level in aluminum radiator? I replaced the upper radiator hose (the C-shape one) and lost coolant in the process that I want to replace. I added 1 gal of coolant. How do I check the coolant level? Thank you!
 
@aeallis3308

Here is a illustration from the 1975 FJ40 Service manual, available here on 'Mud in the reference section:
Note that the instruction states to fill the reservoir tank up to the "Full" line on the tank, in the cold condition.
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