To bypass the heater core in a 1989 Toyota Supra, locate the heater core hoses under the hood. Disconnect the inlet and outlet hoses from the heater core, which are typically found near the firewall. Connect the two hoses together using a suitable connector or a short piece of hose to create a loop, ensuring it's secure to prevent leaks. Finally, check for any coolant leaks and monitor the system for proper operation.
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