Nissan Repair Questions? Ask a Mechanic for Answers ASAP
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If you have noticed the coolant level dropping, but you have no leaks you could have a blown transmission cooler in the radiator. Check your trans fluid level and condition. See if it's over filled and pink and milky. If so, the trans cooler has failed and the transmission will need to be flushed right away in hope that the cross contamination does not damage it.
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Well it's good that it's manual!
Are you verifying that you are loosing coolant cause you have to keep adding coolant to the over flow bottle?
Did you try a coolant pressure test?