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What are the main causes of transmission overheating?

2 Answers

VonClayton

07/25/25 3:43am

The causes of transmission overheating mainly include the following five aspects: 1. High engine and coolant temperature, affecting transmission heat dissipation. 2. Clogged radiator grille. 3. Transmission clutch slippage, generating additional heat. 4. Insufficient flow in transmission cooling oil circuit. 5. Thermostat sticking. Below are the inspection points when transmission temperature is too high: (1) Check whether the transmission is low on oil, whether the radiator fan is rotating, and whether there is oil leakage under the vehicle. (2) It is recommended to change the transmission oil. If the transmission oil relies on the radiator for cooling, check whether the radiator is too dirty.

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DelKhloe

08/10/25 5:05pm

Last time when driving uphill on a mountain road, I encountered high transmission temperature with the red warning light flashing on the dashboard. This issue is mostly related to driving habits, such as prolonged low-speed uphill driving or frequent sudden acceleration, which can cause the clutch to generate excessive heat from intense friction. If towing heavy loads or continuously overtaking, the engine RPM may spike while the vehicle speed fails to increase, causing the transmission fluid temperature to rise above 120°C. My uncle's car had its radiator clogged with insect remains, leading to poor fluid circulation and overheating. It's recommended to pull over immediately upon high-temperature warnings, wait for half an hour to cool down before continuing. For modified cars, installing an additional transmission oil cooler can indeed lower the temperature by about 7-8 degrees.

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