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Where is the orifice tube located on a 1991 ford ranger 4.0 6 cylinder?

On a 1991 Ford Ranger 4.0L 6-cylinder, the orifice tube is located within the high-pressure side of the A/C system, usually near the receiver/dryer. It's not easily visible without removing components. You'll likely need to access it by removing the receiver/dryer (which is itself usually located near the firewall on the passenger side).

Because it's integrated into the A/C system and not a standalone easily-accessible part, precise location descriptions beyond "near the receiver/dryer" are difficult and vary slightly depending on specific model year variations. A repair manual specific to your 1991 Ford Ranger 4.0L will provide the most accurate illustration and instructions.