Is your car's air conditioner not blowing cold air? The problem might be a faulty expansion valve. This Four Seasons part (number 39151) is a direct replacement block-type, O-ring expansion valve used in many vehicle A/C systems. Four Seasons is a trusted brand in automotive climate control parts, known for quality and fit. The expansion valve is a crucial component that meters the flow of refrigerant into the evaporator core; if it's stuck or failing, your A/C won't cool properly. This part comes ready to install. Always make sure this is the correct part number for your specific vehicle make, model, and year before ordering - checking your service manual or consulting a professional is a good idea. Replacing a bad valve can often restore your air conditioning to full, cold-blowing function. The package dimensions are approximately 6.9cm H x 9.9cm L x 7.6cm W, and it weighs about 0.5 pounds. A must-have for DIY mechanics or professionals tackling A/C repairs.