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First take the dash out. Little more complicated as there is a hidden screw up in behind dash new radio console. Once you have taken out all the screw and bolts you will need to grab the center air duct from inside dash and push it up to bypass heater compartment. Then the dash should come out. You will also have to remove the metal tubular bar that runs across from left to right. From there you will need to remove all the bolts in the engine compartment and disconnect the hoses. From there you will need to slip the heater core compartment away from the fan compartment. A little play time and you will have the heater core compartment out. Take the unit apart and you should be good.

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Q: How do you change a heater core in a Chevrolet optra?
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