Identifying R-12 and R-134A Systems

REFRIGERANT SYSTEM IDENTIFICATION
The refrigerant used in this refrigerant system is R-134a. R-134a refrigerant is the only type of refrigerant that can be used in the A/C system.

NOTE: R-134a requires the use of Motorcraft YN-12b refrigerant oil or equivalent meeting Ford specification WSH-M1C231-B.

R-134a systems can be identified by examining the following areas:
^ The vehicle's refrigerant charge tag indicates a R-134a service.
^ The A/C cycling switch has a yellow base.
^ An A/C pressure cut-off switch has been added to the discharge line. This switch is nonexistent in R-12 systems.
^ The high and low service charge ports require quick connect adapters to preclude the use of R-12 service equipment.