The category covers A/C expansion and service valves, heater and coolant control valves, fuel and vapour valves, pressure regulators and the adjusters that set a cable or linkage travel.
About 1,650 parts are listed, split between valves and the regulator and adjuster group, in GM, Ford, Mopar and ACDelco numbers. A/C valves make up a large share of the category, and they are matched to the refrigerant and the system design rather than to the model year alone, because the same vehicle can be built with more than one system.
A/C valves are the parts most often ordered by description rather than by number, and the most often returned for that reason: an expansion valve for an orifice-tube system is not interchangeable with one for a TXV system even when the fittings match. Match the part number, confirm the refrigerant the system uses, and replace the seals with the valve — the old O-rings will not seal twice.
