V.Viscous Converter Clutch Slippage

If previous checks indicate the VCC is slipping, either the clutch apply pressure is low or the viscous clutch is faulty. To determine what is causing the VCC slippage, proceed as follows:

1. Check minimum and maximum line pressures and vacuum supply to the modulator as outlined in the appropriate Cadillac Service Information Manual, and correct any problems found.

FIGURE 10 - CONVERTER CLUTCH REGULATOR AND APPLY VALVES:

FIGURE 11 - DRIVE SPROCKET SUPPORT:

FIGURE 12 - CONVERTER CLUTCH ACCUMULATOR:

FIGURE 13 - CHECK BALL LOCATIONS IN VALVE BODY:

2. If line pressures and vacuum check good, the transaxle must be inspected for leakage in the converter clutch apply passages. Check for VCC apply pressure leakage at:

^ converter clutch accumulator (#423, Figure 12)
^ converter clutch blow-off check ball (414B Figure 12)
^ check ball #10 seat (Figure 13)
^ converter clutch regulator valve (#321 Figure 10)
^ apply passages in the drive sprocket support (passage B in Figure 11)
^ missing/damaged turbine shaft seals or bushings (#507, #514, #518 Figure 11)
3. If no problems are found with the hydraulic portion of the VCC apply circuit, replace the torque converter.

NOTE: If the transaxle fluid has an unusual odor, and/or a thick liquid material that is clear/milky in color is found in the pan, the viscous fluid has leaked out of converter clutch assembly. If this condition is noted, the transaxle must be disassembled, thoroughly cleaned, and the cooler flushed to remove all viscous fluid from the transaxle. When reassembling the transaxle, replace the torque converter, all fiber clutch plates, and bands.