How to Install a Heater Core in a Chevy Cavalier

How to Install a Heater Core in a Chevy Cavalier

Installing a heater core in a Chevy Cavalier refers to replacing the part of the car's heating system which controls the temperature. Although it is a fairly involved process, it is not too complicated, so anyone with a little automotive know-how can accomplish this repair on their own. Follow these steps for how to install a heater core in a Chevy Cavalier.

Steps

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Detach the negative battery line. [1] X Research source
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Lift the front end of your car and prop it up on jack stands. [2] X Research source
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Empty the radiator and loosen the seal to release the valve located under the front passenger's side. [3] X Research source
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Disconnect and remove the A/C heater drain tube from the firewall, if the car is equipped with air conditioning.
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Detach the hoses from the heater core by releasing the clamps. After the cooling system has had a chance to completely empty, lower the jack. [4] X Research source
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Determine the access area for your vehicle. In the case of a Cavalier, you'll have to remove the entire instrument panel from the dashboard.
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Examine the placement of the pipes surrounding the heater core once it is exposed.
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Disconnect the heater core outlet.
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Detach hoses that may still be installed at the heater core, loosen the bolt from the heater core cover and remove the cover. [5] X Research source
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Release the heater core mounting clamps and dislodge the heater core.
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Wipe up any fluid which may have leaked.
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Remove any seals, O-rings or other components that you can utilize on the new heater core.
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Install these parts on the replacement heater core.
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Position the replacement heater core and attach the mounting clamps.
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Replace the heater core cover and reconnect the heater core outlet.
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Reconnect any hoses that you can reach from the interior of the car.
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Wait to reconnect the instrument panel until you've confirmed that everything is properly installed with no leaks.
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Jack the front end up again and replace the jack stands.
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Reconnect the remaining heater core hoses.
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Replace the A/C heater drain tubes at the firewall.
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Follow the owner's manual concerning the proper coolant combination and seal the valve and refill the radiator.
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Remove the jack stands and let down the car. Reattach the negative battery cable. [6] X Research source
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Confirm that the hoses are properly reattached and that the radiator is both filled and capped.
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Start the car and examine the area surrounding the heater core, checking for leaks. [7] X Research source
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Allow the car to run until the engine has reached full temperature, and then continue to look for leaks. [8] X Research source
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Start the heater and confirm proper function.
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Replace the instrument panel after you've made any necessary hose reinstallation.
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Confirm that the radiator is full according to the instructions in the owner's manual.
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Verify that each of the removed components is correctly reinstalled.
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Dispose of all of the fluids you have drained. [9] X Research source
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