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HOMESERVICE MANUALSCHEVROLET2007SUBURBAN C1500, 5.3 0REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 457 (AUTOMATIC TRANSMISSION - ALLISON (TROUBLESHOOTING))TROUBLESHOOTINGTRANSMISSION FLUID CHECKING PROCEDURECOLD FLUID CHECK
2007 Chevrolet Suburban C1500, 5.3 0

Cold Fluid Check

2007 Chevrolet Suburban C1500, 5.3 0SECTION Cold Fluid Check
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The purpose of the cold check is to determine if the transmission has enough fluid to be operated safely until a hot check can be made.

    IMPORTANT: The fluid level rises as fluid temperature increases. DO NOT fill above the COLD CHECK band if the transmission fluid is below normal operating temperatures.
  1. Bring the vehicle to a complete stop on a level surface using the service brakes.
  2. Ensure that the engine is at low idle RPM (500-800 RPM).
  3. With the service brakes applied, put the transmission in the P, PARK, position.
  4. Engage the park pawl by slowly releasing the service brakes. The vehicle may move slightly as the pawl engages.
  5. Apply the parking brake and ensure it is properly engaged.
  6. Run the engine for at least one minute. Apply the service brakes and shift to D, DRIVE, then to N, NEUTRAL, and then shift to R, REVERSE, in order to fill the hydraulic system.
  7. Ensure that the engine is at low idle RPM (500-800 RPM).
  8. With the service brakes applied, put the transmission in the P, PARK, position.
  9. Engage the park pawl by slowly releasing the service brakes. The vehicle may move slightly as the pawl engages.
  10. With the engine running, remove the fluid level indicator from the fill tube and wipe the indicator clean.
    11. IMPORTANT:
    • If the fluid level is within the COLD CHECK band, the transmission may be operated until the fluid is hot enough to perform a HOT RUN check. If the fluid level is not within the COLD CHECK band, add or drain as necessary to bring it to the middle of the COLD CHECK band.
    • Always check the fluid level at least twice using the procedure described above. Consistent readings are important in order to maintaining proper fluid level. If inconsistent readings persist, inspect the transmission vent assembly to be sure that it is clean and unclogged. If readings are still inconsistent, contact your nearest Allison distribution or dealer.
  11. Insert the fluid level indicator into the fill tube and remove. Check the fluid level reading. Repeat the check procedure to verify the reading.
  12. Perform a hot check at the first opportunity after the normal operating sump temperature of 71-93°C (160-200°F) is reached.
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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.