Coolant. Bypass hose is gone now, I'll just make sure my rad is cleaned out and should be fine
The bypass hose has nothing to do with the radiator. It's there to keep coolant circulating within the block when the engine is idling and the thermostat closes flow to the radiator (due to your cold weather climate)...you may want to re-think putting it back in. The t-stat should be a by-pass type, not a regular SBC car type...opens flow to the By-pass when closed (no flow to the radiator) and closes the By-pass when it opens flow to the radiator.
Mike B
