Service Procedure

^ The procedure for installing the bypass valve assembly on 1989 AS-Body models without trailer tow is the same as shown in the instructions already provided in the dealer recall notification letter (# 281T) for trailer tow vehicles.

^ For 1989 AC-Body models, the procedure is the same as previously described for recall # 281T except there is no drilling required (procedure step 3). A 1/4 inch hole already exists in the frame rail for the push-in tie strap to retain the valve assembly.

^ The procedure for 1990 AC and AY-Body models is also the same as previously described for recall # 281T except as follows:

FIGURE 11990 AC AND AY-BODY CARS:

- A plate is attached to the frame rail where the valve assembly is to be located. Therefore, a 1/4 inch hole must be drilled through the plate (at the location shown in Figure 1 of this letter to accommodate the pushin tie strap.

FIGURE 21990 AC AND AY-BODY CARS:

- Install the other retaining tie strap by routing the strap through the two existing frame holes as shown in Figure 2.

Figure 31990 AS-Body with External Cooler (Trailer Tow or Town & Country):

^ Installation of the bypass valve assembly on 1990 AS-Body models differs as follows (see Figure 3):

- To install the valve assembly, cut the cooler hoses in line with the center of the large hole in the bottom of the frame.

- Install bracket PN C3940385 to retain the upper cooler hose, using the existing lower battery tray attaching bolt.

- Since the valve assembly will be clear of the frame rail with this installation, the anti-rattle foam tube and tie straps are not required.
Important: Remember that the bypass valve must be installed in the proper flow direction. Be sure to identify the transmission fluid out (outlet and in (inlet) fittings at the transmission as shown in Figure 5 of the original Recall # 281T service procedure. Then follow the hoses from the transmission to the valve mounting location to ensure that the valve is attached properly to the "in" and "out" hoses as shown in Figure 8 of the original recall service procedure.