Hello all, first post. Got a new to me 1996 E150 with the 300 I6. Besides running hot it drove 3 hours home just fine but as I'm going through the van to repair the cooling system I found this big plug just hanging by the brake master. Then the small coolant hose that connects to the radiator by the transmission cooler lines is plugged with a chisel... Can anyone tell me what that plug and coolant hose go to? Thanks in advance!

 

I ran picture of the plug though AI came back saying part of ABS.

 

Need some more pix showing where the other ends of those hoses go.

 

First pic zoom out and attach a new pic.
Second pic it's likely a diagnostic port but not for ABS, you can see the connector has no locking tab for quick disconnect, diagnostic ports are all like that. Attach a new pic showing the wire pinout side, right now I can only see 7 wires.

 

I opened hood on my van took pictures. A similar looking plug goes to cruise control servo

 

Thanks for all the replies everyone, cruise control would make sense on the plug my van doesn't have cruise. As for the coolant hose it comes from a small port in the bottom radiator tank. Heater hoses are both hooked up, I see no where this could possibly connect to up top. I have a couple more pictures. Thanks again!