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Part of the coolant reservoir at cowl near the evaporator assembly. '90+ cars are here. You shouldn't need a snapshot. Did a quick eBay and this should be every thing you need "FOR INFORMATION":
What year is important, there are changes between the years.
below is a pic of my low coolant connector on the radiator, passenger side look down past the cap on the radiator (early C4) past the transmission cooler line.