GM 52495729 Valve Kit,A/C Evaporator Thermal Expansion

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There exist several approaches employed by these systems of air conditioners converting high-pressure liquid refrigerant to low-pressure vapor, and this happens at the level of the air conditioning evaporator. As it circulates through the evaporator, it reduces in temperature and cools down the airflow that is delivered into the ducts. This change often occurs quickly due to tubing diameter variation and in many cars there is a removable controlled orifice located on any one refrigerant line at firewall. Moreover, other models have A/C Expansion Valve which also functions as a controlled orifice for both front and auxiliary air conditioning systems. The A/C Expansion Valve must be removed from the system by discharging the air conditioning system while disconnecting the refrigerant lines from either firewall or rear air conditioning unit where they join A/C Expansion Valve. Finally, after removing two bolts holding it in place, remove valve with four O-rings and replace them accordingly before re-installing everything back to its position as part of installation process.

High-pressure liquid refrigerants can be changed into low-pressure vapors through various means in air conditioning systems. Located at the evaporator of the air conditioner, this conversion is facilitated by passing the coolant through it making sure that it cools thus cooling down the air flow being delivered into vents. Typically, such a change is brought about by a sudden variation in tube sizes; however some vehicles may have a removable controlled orifice within one of their firewalls connected to a certain refrigerant line. Nonetheless, an automatic expansion valve which performs the same function as a controlled orifice. To begin with, discharge your A/C system so that you can remove A/C expansion valve followed by loosening its nut and separating both refrigerant lines from the A/C expansion valve at firewall. Consequently, two securing bolts will come out to allow for removal of the valve itself. On installation, just reverse what was done during removal.