[PGSigns]

The coolant will be the same as the outside temp and remain liquid as long as you have enough antifreeze in it. The time it takes you to get heat will depend on how long it takes the engine to make water warm enough to ad heat to the air circulating over the the heater core and as said above warm the duct work enough to still be warm when enters the cab. The cab will start to feel warm once the heater has had time to start warming the air and all the other stuff in the cab. My motor builds heat slow and as cold as it has been here takes a while to get warm in the cab.
Jimmy