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To replace the expansion valve on the rear AC of a 1992 GMC Suburban, first ensure the AC system is fully discharged to avoid refrigerant exposure. Remove the rear AC unit's cover and disconnect the refrigerant lines connected to the expansion valve. Remove any mounting screws or bolts securing the valve, then take out the old valve and install the new one, ensuring proper orientation and sealing. Finally, reconnect the refrigerant lines, reassemble the AC unit, and recharge the system with refrigerant.

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2mo ago

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