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.
The gas tank on a 1990 Chevy Corsica is 15.6 gallons. A 1990 Chevy Corsica takes unleaded gas not premium.
You must drop the fuel tank in order to replace the fuel pump.
in the fuel tank
in the glovebox.
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removing the retaining bolts.
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under the kick panel passenger side