Air carrier flight crew reported a Ground Conflict with vehicle during taxi.

Narrative

Taxiing to deice Spot XX in ZZZ on an originator. While headed south preparing to turn right into the assigned spot; a vehicle with a light bar (unlit); failed to yield to us while departing the pad. This vehicle was coming from the pad area; approximately near where some deice trucks were waiting for new Customers. I was looking ahead and to the right; approximately my 1:00 position; in anticipation of turning into the assigned Spot. The First Officer (FO) was looking to the right and called out the car which was approaching from the 3:00 position. I slowed the taxi speed; anticipating that the vehicle would do the same; as we have the right of way.His roof mounted light bar was unlit; so it didn't seem as if he was in any sense of urgency; and I expected him to stop. He did not. Not even slow down. I quickly applied the brakes when it was clear he was proceeding; and the aircraft quickly stopped; my guess is he passed approximately 15-20 ft. off the nose by the time we had stopped. The vehicle continued into the open area at the west end of C Concourse; where lots of ground equipment is stored. I have no idea who he was; or what hurry he was in; but had the FO not called him out; or had been heads down; running a checklist; or simply not looking that direction; I have no doubt we would have collided.Find out who the driver of the vehicle is; and retrain. This is unacceptable. There were no indications he was an emergency vehicle responding to an incident; and with all the lights on the deice pad (aircraft; trucks; etc) it was hard to judge his distance and path until he was close; and it was clear he was not stopping. It wasn't even as if he slammed on the brakes at the last second; it was like we weren't even there. I don't know who Company is or what their job is on the ramp; but the driver of that car needs to be retrained on proper ramp movement procedures today. The next guy may not be so lucky.