Express 3500 V8-6.0L (2010)
Fluid - A/T: Testing and Inspection
Transmission Fluid Cooler Flushing and Flow Test
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 failure. 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 J 45096 - flush and flow test tool or equivalent to flush and flow test the transmission oil cooler and the oil cooler pipes after the transaxle
is removed for repairs.
Only GM Goodwrench DEXRON(R)VI 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 and flow testing are as follows:
Cooler Flow Check and Flushing Steps
1. Machine Set-up
2. Determine Minimum Flow Rate
3. Back Flush
4. Forward Flush
5. Flow Test
6. Code Recording Procedure
7. Clean-up
Special Tools
*
J 45096 - Transmission Oil Cooling System Flush and Flow Test Tool
*
J 45096-30 - Transmission Cooler Flush Adapter
*
Shop air supply with water/oil filters, regulator and pressure gauge - minimum 90 psi
*
Eye protection
*
Rubber gloves
For equivalent regional tools, refer to Special Tools (See: Tools and Equipment/6L45/6L50/6L80/6L90 - Automatic Transmission).
Machine Set-up
1. Verify that the main power switch (1) is in the OFF position.
2. Place the main function switch (2) in the IDLE position.
