Automatic Transmission Oil Cooler Flushing and Flow Test (J 35944-A): Notes
GM studies indicate that plugged or restricted transmission oil coolers and pipes cause insufficient transmission lubrication and elevated operating temperatures which can lead to premature transmission wear-out. Many repeat repair cases could have been prevented by following published procedures for transmission oil cooler flushing and flow checking. This procedure includes flow checking and flushing the auxiliary transmission oil cooler, if equipped.
- Torque converter
- Oil pump
- Oil pump drive shaft
- Drive sprocket support
- Transaxle overhaul complete
- Transaxle assembly replacement
- Torque converter
- Oil pump
- Turbine shaft
- Transmission overhaul complete
- Transmission assembly replacement
Only GM Goodwrench DEXRON®III automatic transmission fluid should be used when doing a repair on a GM transmission.
Time allowance for performing the cooler flow checking and flushing procedure has been included in the appropriate labor time guide operations since the 1987 model year. The service procedure steps for oil cooler flushing are as follows:
Cooler Flow Check and Flushing Steps
- Tools Required
- Preparation
- Back Flush
- Forward Flush
- Flow Check
- Clean-up
Tools Required
- J 35944-A Transmission Oil Cooler Flusher
- J 35944-22 Transmission Oil Cooler Flushing Fluid
- J 35944-600 Transmission Cooler Flush Adapter
- Measuring cup
- Funnel
- Water supply - hot water recommended
- Water hose, at least 16 mm (5/8 in) ID
- Shop air supply with water/oil filters, regulator and pressure gage
- Air chuck with clip, if available
- Oil drain container
- Pail with lid 19 L (5 gallon)
- Eye protection
- Rubber gloves