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 MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 192 (AUTOMATIC TRANSAXLE SERVICING)LUBRICATIONOIL COOLER FLUSHING & FLOW TESTFORWARD FLUSH
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Forward Flush
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Forward Flush
WARNING: This page is about a different car, the 2003 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
- Disconnect both hoses (3 and 5) from the oil cooler pipes and connect them to the opposite oil cooler pipe. This will allow the oil cooler and pipes to be flushed in the normal flow direction. See Figure .
- Repeat steps 6 and 13 of Back Flush procedure.
- Release the trigger (8) of the transaxle oil cooler and line flusher and allow water only to rinse the oil cooler and pipes for one minute. See Fig 1 .
- Turn the transaxle oil cooler and line flusher water supply valve (1) to the OFF position and turn off the water supply at the faucet. See Fig 1 .
- Attach the shop air supply to the flushing system feed air valve (2) on the transaxle oil cooler and line flusher and blow out the water from the oil cooler and pipes. Continue, until no water comes out of the discharge hose. See Fig 1 .
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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.