5th generation 626, built on the GF platform.

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How do I dismantle and change Heater Core?

When fan and heater/defroster are on, there are fumes inside auto.

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It is not the heater core causing the fumes.

The heaters work by using hot water from the engine, when the heater core is faulty you will normally get a puddle on the floor inside the car but no fumes.

Could there be a hole somewhere in the exhaust?

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