Where is the expasion valve no 1990 Honda Civic DX?

In a 1990 Honda Civic DX, the expansion valve is typically located in the engine compartment, near the firewall. It is part of the air conditioning system and is usually found between the evaporator and the condenser. To access it, you may need to remove some components, such as the dashboard or the A/C lines. Always refer to a repair manual for detailed instructions specific to your vehicle.