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 Where is the orifice tube on a 1991 chevy silverado Since about mid-year 1991, the orifice will be in the lower line on the condenser, so you'll have to remove the grille to access it. Early 1991-back to 1988, it was in the lower line off the evaporator. The orifice tube restricts the flow of refrigerant to the evaporator. This restriction allows high pressure liquid Freon to change into low pressure Freon before entering the evaporator. The orifice tube is located inside the hose running between the condenser and the evaporator. You'll need an orifice tube removal kit if you are looking to remove it. Its not that cut and dried, First you will need the refrigerant recovered, then take the old one out. It should be in the small line entering the evaporator. Take it out, if there is metal shavings on it, then you need to replace the compressor and flush the condenser, or replace the condenser. the short end (looking at the o-ring) goes in towards the rear of the car. Then you wi...