Automatic Transmission Oil Cooler Flushing and Flow Test: Notes

WARNING: This page is about a different variant/trim than selected.

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 cases could have been prevented by following published procedures for transmission oil cooler flushing and flow checking. This procedure includes flushing and flow checking the auxiliary transmission oil cooler, if equipped. GM requires that transmission oil cooler flushing and flow checking be performed whenever a transmission is removed from the vehicle for service within warranty, including:

Goodwrench SRTA
Major overhaul
Torque converter replacement
Oil pump replacement

Only GM Goodwrench DEXRON® VI automatic transmission fluid should be used when doing warranty repair on GM transmissions.

Tools Required

J 35944-A Transmission Oil Cooler and Line Flusher
J 35944-22 Transmission Oil Cooler Flushing Fluid
J-44835-1 Transmission Oil Cooler Flusher Adapters. See Special Tools .
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
Minimum 19 L (5 gallon) pail or similar container with lid
Eye protection
Rubber gloves