In order for the heater to work, the radiator needs to be full of coolant; if it is , then run engine for 20 minutes and check temp gauge; is it at operating temperature? If not replace the engine thermostat; if it is at operating temperature then take your hand and place it on both heater hoses; are the both hot? if only one is hot then your heater core is plugged and it will need to be flushed or replaced if you cannot flush it.( The heater hoses are on the passenger side and go thru the firewall) I hope this helps you. Mark
cost to replace heater core 1994 corsica
A Haynes or chiltons manual has the how to. Or do a search for a forum for Chevy corsica specific
Drain the water from your 1990 Chevy Corsica cooling system. Remove the heater core water supply hoses. Remove the heater core retaining bolts. Reverse the process to install the new heater core.
Its located in the center of the vehicle below the dash.................
your heater core is leaking
Check the Fuse and/ or relay.
inside dashboard on passenger side
Under dash, near firewall, passenger side.
Run a new one from the blower motor body to ground
Could be your crank sensor. These are very common to fail on these cars.
Heater box drain It is just below the heater hose conections, If the heater core leaks it drains the coolant outside to keep the carpet dry.
Leak in heater core