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To change the heater matrix on a Volvo 740, start by disconnecting the battery and draining the cooling system. Remove the dashboard and the center console to access the heater unit. Detach the heater hoses, unbolt the heater matrix from the unit, and replace it with the new one. Reassemble the components in reverse order, ensuring all connections and seals are secure before refilling the coolant and reconnecting the battery.

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2mo ago

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