Have her download the owner's manual for free via
https://techinfo.honda.com/rjanisis/logon.asp (see "owner's
manuals" link on left); and follow the directions for
replacing the coolant on pages 203-205. :-)
If she has trouble navigating the pdf file with the owner's
manual, post back. The whole manual truly is there. Ya just
gotta be smarter than Bill Gates to get it.
Aside: Love that link to the owner's manuals, Mr. Tegger!)
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