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Caution:On models equipped with Delco-Loc 2 or Theftlock audio systems make sure you have activation code * Disconnect the negative battery cable * Drain the cooling system * Disconnect the heater hoses at the heater core inlet and outlet on the engine side of the firewall and plug the open fittings * From the inside of the car remove the lower right dash insulator panel and the glove box * Disconnect the ducts from the heater cover * Remove the instrument panel from the passanger compartment * Remove the heater core cover * Remove the heater core clamp bolts and clamps then slide the heater core out carefully * Installation is reverse of removal

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Q: How do you replace a 1999 cavalier heater core?
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