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Attached procedure from my bootleg manual. ($60 on ebay...and it's proven to be pretty useful, not quite as good as the old factory manuals, but good enough.)
the manual doesn't tell you how to bleed out the air from the system tho?
you should leave the expansion bottle open and let it heat it up to temperature. It should self bleed the air... Then fill to level again. Havent done my GS but almost all newer generation cars are like that