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What causes the transmission temperature of a BMW 730 to be too high?

3 Answers

LaGemma

07/29/25 6:46am

BMW 730 transmission temperature too high reasons are as follows: Engine and water temperature too high: Prolonged or overloaded engine operation can increase the coolant temperature, thereby affecting the transmission's heat dissipation; additionally, insufficient coolant in the radiator reduces the cooling system's effectiveness, leading to transmission overheating; Transmission clutch slipping: Clutch slipping generates additional heat, raising the transmission temperature and degrading the transmission oil quality, which in turn increases transmission wear; Thermostat stuck: If the transmission's thermostat is stuck, the oil inside the transmission cannot enter the cooling system, preventing the heat generated by the transmission from being cooled.

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ZacharyLee

08/12/25 10:46pm

I've been driving for many years and have encountered numerous instances of transmission overheating, especially in high-end cars like BMW. The most common cause is a problem with the cooling system, such as a stuck radiator fan or blocked cooling lines, which prevents heat from dissipating. Aging or insufficient transmission fluid is also a big issue—using old fluid is like cooking with stale oil; it heats up quickly. Driving habits play a role too; frequent sudden acceleration in traffic or towing heavy loads can significantly increase the transmission's workload, making it more prone to failure under high temperatures. The BMW 730 has a smart system, and the temperature sensor might give false alarms, but don’t take it lightly. High temperatures can cause internal transmission components to wear out or even fail completely, leading to costly and time-consuming repairs. I recommend stopping the car immediately to check the cooling components and fluid levels, and it’s best to contact a professional shop for a full diagnosis to prevent future occurrences.

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AlyssaLee

10/04/25 4:21am

My buddy's BMW 730 had the same transmission overheating issue last year, with frequent warnings during city traffic jams. We analyzed that it might be due to excessive dust accumulation on the radiator affecting ventilation, or insufficient viscosity of the transmission fluid. BMW's automatic transmissions are particularly sensitive, especially prone to overheating in hot weather. Don't overlook driving habits either – frequent hard braking or hauling heavy loads uphill can increase the strain. Prolonged driving under such conditions may lead to drivetrain damage, which is not only expensive to repair but also dangerous. Regular fluid maintenance is crucial – for instance, I personally change the fluid every 2-3 years to prevent most issues. Economical driving helps too; avoid sudden acceleration to give the transmission a breather.

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