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My 81 Tbird has a hose that is coming out of the firewall into engine area on passanger side. Antifreeze not all time. What this Hose small in size.?

The hose you're referring to is likely the heater core hose, which is responsible for carrying coolant from the engine to the heater core located inside the passenger compartment of your vehicle. The heater core then uses this coolant to transfer heat into the cabin, providing you with warm air when you turn on the heater.

Here's some additional information about the heater core hose:

- It's typically made of a durable rubber or plastic material and is designed to withstand the high temperatures and pressures involved in the cooling system.

- The heater core hose usually connects to a fitting on the engine block (often near the thermostat housing) on one end, and to the heater core itself on the other end.

- It's important to keep the heater core hose in good condition to ensure that the heater in your vehicle is functioning properly. If the hose develops leaks, cracks, or becomes blocked, it can restrict the flow of coolant to the heater core, preventing it from providing heat to the cabin.

- If you notice any signs of coolant leakage or if the heater is not providing sufficient heat, you should inspect the heater core hose for any damage and have it replaced if necessary. It is recommended to have a qualified mechanic perform the inspection and replacement.

It's important to note that you should not drive your vehicle if you notice significant coolant leakage, as this can lead to overheating and engine damage. If you're not comfortable checking or replacing the heater core hose yourself, it's best to take your vehicle to a reputable mechanic or automotive repair shop for assistance.