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What Causes Transmission Overheating?

2 Answers

DelJourney

07/24/25 3:59pm

Transmission overheating reasons: Insufficient lubricating oil in the transmission or using lubricating oil with an incorrect specification, excessively tight bearing assembly, excessively tight gasket and washer assembly, or excessively small gear meshing clearance in newly replaced gears. To avoid affecting usage, it is recommended to promptly contact a 4S shop for repair. Below is additional information: 1. When stopping to inspect during driving: Touch various parts of the transmission housing with your hand to check the temperature. If the temperature is bearable to the touch, the oil temperature is normal; if it is unbearable, it indicates an overheating issue. To confirm transmission overheating, first check the lubricating oil level. If it is insufficient, replenish it as required; if the oil is too thin or deteriorated, replace it. If dry friction is caused by excessively small assembly clearance (e.g., overheating near the bearing seat due to excessively tight bearing assembly), disassemble and inspect accordingly, then reassemble following the specifications. 2. Precautions for transmission overheating repair: The normal operating oil temperature for an automotive transmission is 80°C~90°C. Excessive transmission operating temperature can cause premature oil oxidation, especially when the transmission operating temperature exceeds 120°C~200°C, as the antioxidant additives in the oil become ineffective, drastically accelerating oil oxidation. Transmission overheating can be judged based on the overheating location. The causes of overheating are generally: excessively small gear meshing clearance; bent gear shafts or misaligned or non-parallel housing shaft holes; insufficient gear oil or too low viscosity; excessively tight bearing or gasket assembly, etc. If transmission overheating is confirmed through inspection, repair accordingly.

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LunaRose

08/11/25 8:55am

I love driving around, and I've encountered transmission overheating a few times. The most common causes are insufficient transmission fluid or dirty fluid—just like engine oil, it needs regular changes, typically every 30,000 kilometers. If you keep delaying the change, the fluid turns into thick black sludge, which obviously hampers cooling. Another issue is stop-and-go traffic, where constantly alternating between accelerating and braking forces the transmission to shift gears repeatedly—like pedaling hard uphill on a bike—no wonder it heats up! Also, climbing long hills with the AC on in summer is a surefire way to overheat. Last time I drove on mountain roads, I smelled burning after just two hours. Remember to clean the cooling fins regularly too; if they're clogged with leaves or bugs, it's like covering them with a blanket.

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