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 MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN PASSENGER EXTENDED, 5.0 MREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 755 (AUTOMATIC TRANSMISSION, 4L60-E/4L65-E (TROUBLESHOOTING))TROUBLESHOOTINGAUTOMATIC TRANSMISSION OIL COOLER FLUSHING AND FLOW TEST (J 45096)DETERMINE MINIMUM FLOW RATE
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 M
Determine Minimum Flow Rate
2001 Chevrolet Chevy Express G2500, Van Passenger Extended, 5.0 MSECTION Determine Minimum Flow Rate
WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
- From the machine display, identify the temperature of the automatic transmission fluid that is stored in the supply vessel of J 45096 .
- Determine whether the transmission oil cooler is steel or aluminum by using a magnet (1) at the cooler flange (2) at the radiator.
- Refer to the table below. Using the temperature from step 1, locate on either the Steel MINIMUM Flow Rate table or the Aluminum MINIMUM Flow Rate table the minimum flow rate in gallons per minutes (GPM). Record the minimum flow rate in GPMs and the supply fluid temperature for further reference.
Example:
- Fluid temperature: 24°C (75°F)
- Cooler type: Steel
The MINIMUM flow rate for this example would be 0.8 GPM.
- Inspect transmission oil cooler lines for damage or kinks that could cause restricted oil flow. Repair as needed and refer to the appropriate GM service manual procedures.
Minimum Flow Rate in Gallons Per Minute (GPM)
| Temperature Range | Steel | Aluminum |
|---|---|---|
| 65-66°F | 0.6 gpm | 0.5 gpm |
| 67-70°F | 0.7 gpm | 0.6 gpm |
| 71-75°F | 0.8 gpm | 0.7 gpm |
| 76-80°F | 0.9 gpm | 0.8 gpm |
| 81-84°F | 1.0 gpm | 0.9 gpm |
| 85-89°F | 1.1 gpm | 1.0 gpm |
| 90-94°F | 1.2 gpm | 1.1 gpm |
| 95-98°F | 1.3 gpm | 1.2 gpm |
| 99-103°F | 1.4 gpm | 1.3 gpm |
| 104-108°F | 1.5 gpm | 1.4 gpm |
| 109-112°F | 1.6 gpm | 1.5 gpm |
| 113-117°F | 1.7 gpm | 1.6 gpm |
| 118-120°F | 1.8 gpm | 1.7 gpm |
RENDER: 1.0x
NO RELATED
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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.