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All the car's connectors have some sort of locking mechanisms so they can't vibrate apart, you just need to figure it out... I don't know that particular connector but here are a couple ideas ("press here" being my best guess - with a possible match on the opposite side)
I had to depress all the way in on one spot on the edge of the female connector (permanently attached to radiator fan) where the male and female ends meet.
It also helped being able to get both of my hands on the connector. Before, I was being assisted due to having very little clearance underneath (was trying to work without raising car) and I would depress from up top and my assistant would pull from underneath and vice versa. Having at least 2 feet of clearance underneath the car is a must.