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.
Transmission Fluid Cooler Leaks at Radiator
Transmission fluid may leak between the radiator in-tank transmission fluid cooler and the transmission fluid cooler fitting (not the transmission fluid cooler tube into the fitting), which may result in a residue of transmission fluid on the radiator tank around the transmission fluid cooler fitting. Insufficient thread sealer on the transmission fluid cooler fitting may cause this.
- Clean the area around the transmission fluid cooler fittings.
- Verify that transmission fluid is leaking between the transmission fluid cooler tube fitting into the transmission fluid cooler (not the transmission fluid cooler and the transmission fluid cooler fitting).
- Inspect the rubber transmission fluid cooler hose and the transmission fluid cooler fitting clamp. If the leak is at the transmission fluid cooler fitting, install a new transmission fluid cooler fitting clamp or the transmission fluid cooler hose.
- If the leak is at the transmission cooler fittings, install a new radiator. Refer to ENGINE COOLING article.
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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.