Chevrolet 92229746 Valve Kit, A/C Evaporator Thermal Expansion

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There are several ways that air conditioning systems convert the high-pressure liquid refrigerant from the compressor to lower-pressure vapor. The conversion takes place at the air conditioning evaporator. The evaporator is chilled as the refrigerant passes through, cooling the air flow through the evaporator for delivery to the vents. The conversion is usually accomplished by a sudden change in the tubing size. Many vehicles have a removable controlled orifice in one of the air conditioning pipes at the firewall. The models covered use a A/C Expansion Valve (TXV) that accomplishes the same purpose as a controlled orifice. To remove the A/C Expansion Valve, have the air conditioning system discharged by a licensed air conditioning technician, then disconnect the refrigerant lines from the A/C Expansion Valve (remove the nut retaining the refrigerant pipes lo the thermal expansion valve). Remove the two bolts securing the valve, then remove the valve. Installation is the reverse of removal. Have the system evacuated, recharged and leak tested by the shop that discharged it. Installation is the reverse of removal. Have the system evacuated, recharged and leak tested by the shop that discharged it. Note: The A/C Expansion Valve (TXV) is located next to the brake booster in the engine compartment.