Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2008CHEVY EXPRESS G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 18 (AUTOMATIC TRANSAXLE SERVICING)LUBRICATIONOIL COOLER FLOW TESTFLOW CHECK
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Flow Check
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Flow Check
WARNING: This page is about a different car, the 2003 Cadillac Seville and 2003 Cadillac DeVille. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect both hoses from the oil cooler pipes. Connect the oil cooler feed pipe, front connector, located on the case cover, to the transaxle and the return pipe, rear connector, located on the case, to the discharge hose (5). Clip the discharge hose (5) onto the empty oil drain container. See Figure .
- Confirm the transaxle is filled with automatic transmission fluid. See CHECKING FLUID LEVEL & CONDITION .
- Start the engine with the transaxle in PARK range and run for 30 seconds. A minimum of 2 qts. (1.9L) must be discharged during this 30 second run time. If fluid flow is greater than 2 qts. (1.9L) in 30 seconds, go to step 4
. If fluid flow is less than 2 qts. (1.9L) in 30 seconds, perform the following diagnosis. Disconnect the oil cooler feed line at the radiator. Connect the discharge hose (5) to the cooler feed line. Clip the discharge hose (5) to the empty oil drain container. See Figure
. Start the engine with the transaxle in PARK range and run for 30 seconds. A minimum of 2 qts. (1.9L) must be discharged during this 30 second run time. Do the following according to the flow rate:
- Insufficient feed flow: inspect the transaxle.
- Sufficient feed flow: inspect the oil cooler return pipe and the oil cooler, and auxiliary cooler, if equipped.
- Remove the discharge hose (5), reconnect the cooler feed and return pipes to the transaxle and refill the unit to the proper fluid level. Inspect the transaxle oil cooler pipe connections at the radiator, the auxiliary cooler, if equipped, and the transaxle for leaks.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.