I was trying to get all the air out of my cooling system (got a new rad), following the Bentley instructions, and I noticed coolant coming out of a hose near the firewall, passenger's side, down low.

Is that a vent hose for coolant, or should it be connected to something? Is it normal for coolant to get vented like that when bleeding the system? Bentley makes no mention of it.

It was coming out in a small but steady stream, and left about two cups of coolant on the ground in about a minute. I think the flow only started after the engine was up to temp. The HVAC was at full hot, as per the Bentley instructions.

Thanks in advance for any answers.