Transmission Fluid Cooler Flushing and Flow Test: Notes

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

GM studies indicate that plugged or restricted transmission oil coolers and line 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.

NOTE: Use the SA 9165T: line flusher or equivalent to flush the transmission oil cooler and the oil cooler line whenever the transmission is removed for the following repairs:

Torque converter
Oil pump
transmission overhaul complete
transmission assembly replacement

Use the appropriate transmission fluid when performing a transmission repair. Only GM Goodwrench DEXRON®VI automatic transmission fluid should be used when doing a repair on a six (6) speed 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

Special Tools

DT-48312: Transmission Cooler Flushing Adapter
J 35944-22: Cooler Flushing Fluid
SA 9165T: Oil Cooler Line Flusher
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

For equivalent regional tools, refer to Special Tools .