A/T - Intermittent/No Torque Converter Clutch Apply
89buick05Bulletin 89-7125-6
Date Mar., '89
Ref. No. 89-070-7125
Corp. Ref. No. 877157R
SUBJECT: INTERMITTENT AND/OR NO [1][2]TORQUE CONVERTER CLUTCH APPLY
MODELS AFFECTED: 1989 CENTURYS, SKYHAWKS AND SKYLARKS EQUIPPED WITH A THM 125C/HYDRA-MATIC 3T40 TRANSAXLE
BULLETIN COVERS
Intermittent [1][2]Torque Converter Clutch Apply and/or No Torque Converter Clutch Apply due to Solenoid Assemblies (333) that may be inoperative.
DATE OF PRODUCTION CHANGE (Figure 1)
Suspect solenoids will have the following production dates stamped on the solenoid body: 258, 268, 278, 288.
Solenoid assemblies produced before and after these dates are not affected.
SERVICE ACTION
Refer to Section 6E3-C8 Torque Converter Clutch (TCC) System and Section 7 Transaxle Diagnosis Section of your service manual to verify if the solenoid assembly is functioning properly.
Do not attempt to repair suspect solenoid assemblies.
If an inoperative solenoid assembly is found in any THM 125C/HYDRA-MATIC 3T40 replace it with a new one.
SERVICE INFORMATION
Refer to the following part number when replacement of the solenoid assembly is necessary.
Part No. Description
8652379 Assembly, Solenoid and Conduit
Parts are currently available from GMSPO.
SERVICE MANUAL REFERENCE
Whenever servicing a solenoid assembly on any THM 125C/HYDRA-MATIC 3T40 refer to the Unit Repair Section of your service manual.