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Where is the petcock to drain radiator on an 89 Chevy Corsica?

The 1989 Chevy Corsica doesn't have a petcock specifically for draining the radiator. Instead, you drain the coolant by removing the lower radiator hose. Locate the lower hose where it connects to the radiator, usually at the bottom driver's side. Place a drain pan underneath, loosen the hose clamp, and carefully remove the hose to drain the coolant.