How do you change heater control valve in 1990 98oldmobile?

To change the heater control valve in a 1990 Oldsmobile 98, first, ensure the engine is cool and disconnect the battery. Locate the valve, typically near the firewall on the passenger side, and remove the hoses connected to it by loosening the clamps. Unscrew the mounting bolts to remove the old valve, then install the new valve in reverse order, making sure the hoses are securely attached. Finally, reconnect the battery and check for any leaks after starting the engine.