Buick Regal 2018-2026 Service Manual / Transmission / Transmission Cooling System / Diagnostic Information and Procedures
Buick Regal: Diagnostic Information and Procedures
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Transmission Overheats
TRANSMISSION FLUID COOLER FLOW TEST AND FLUSHING (6T50)
GM studies indicate that plugged or restricted transmission oil coolers and
pipes cause insufficient
transmission lubrication and elevated ope
Transmission Fluid Cooler Flow Test and Flushing (AF50-8)
Special Tools
DT - 45096 TransFlow Cooler Flush Machine
DT - 45096 - 30 TransFlow Adapter
For equivalent regional tools, refer to Special Tools.
GM studies indicate that plugged or restricted tra
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Water Pump Pulley Replacement (3.6L LGX)
Preliminary Procedure
Drive Belt Replacement.
Water Pump Pulley Bolt [4x]
CAUTION: Refer to Fastener Caution.
Tighten
10 N.m (89 lb in)
Water Pump Pulley
Procedure
1. Install the EN-46104 Water Pump Pulley Holding Tool onto the water
pump
pulley mounting holes.
2. Remove the wate
DTC B388B or B388C
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptors
D
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