Hello all, I own a 1973 Corvette Stingray which until recently has given me 0 issues. Currently I have an overheating issue, all fluid are topped off so that's not it. After running for a little while something are 20ish minutes of road driving it starts overheating. The coolant system makes a noise similar to a pump being airbound, and coolant leaks into the passenger side foot well. Any ideas how to tackle this?

 

Welcome to the forum.
The leaking in the passenger footwell is most likely caused by a heater core leak.
The overheating could be caused by a sticky thermostat, debris in front of the air conditioner condenser core, debris trap between the A/C condenser and the radiator core, a clogged radiator core, a bad thermostatic fan, missing or degraded foam seals between the condenser and radiator core, missing or degraded foam seal between the hood and the top of the radiator, radiator cap is not functioning properly, missing spring in the lower radiator hose that allows it to collapse, or possibly a bad water pump.