At what temperature does transmission fluid break down?

The ideal fluid temperature is under 175 degrees, but as fluid ages it starts to break down and lose its capacity to cool down the transmission. This is when transmission overheating occurs. At 220 degrees, varnish forms. At 240 degrees, seals start to harden.

What temperature is too hot for transmission fluid?

Fluid Life Expectancy vs Temperature

The ideal operating temperature of transmission fluid is 175 degrees. Overheating occurs after the temperature surpasses 200 degrees, and the failure rate doubles for every additional 20 degree increase after that.

At what temp does ATF breakdown?

ATF that enters the radiator cooler at 300 degrees F. leaves at 240 to 270 degrees F., which is only a 10 to 20% drop in temperature, and is nowhere good enough for extended fluid life.

Is 200 degrees hot for a transmission?

The ideal temperature for your transmission is 200 degrees. For every 20 degrees past 200, the lifespan of your transmission is reduced by a factor of 2. In other words, if you hit 220 degrees, you can expect to get about half the normal life out of your transmission. … Hot transmissions give off an odor.

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How do I lower my transmission fluid temperature?

Transmission fluid additives contain special coolants designed to reduce the temperature of your transmission, particularly when it is under strain from stop and go traffic, driving on hilly terrain or carrying extra weight. Transmission fluid additives can be purchased at most auto supply stores.

How high is too high for transmission temp?

The optimal temperature range for transmission fluid is 175 to 220 degrees. Above that, for every 20 degrees bad things happen, starting with formation of varnish at 240 degrees, followed by seals hardening, plates slipping, seals and clutches burn out, carbon is formed, and, ultimately, failure.

What to do when transmission is overheating?

What to do when your transmission is overheating:

  1. Stop driving immediately and let your transmission cool down.
  2. Make a note of what you were doing, where you are, what’s happening (noises, etc.)
  3. After cooling down, start back up & gingerly continue on your way.

How do I know if my transmission is overheating?

Signs and Symptoms of Overheating transmission

  1. Burning Smell. The first line of defense of an overheating transmission is a conspicuous burning smell. …
  2. Slow Transmission Response. When your transmission system fails, it could be due to a host of problems; overheating could be one of them. …
  3. Fluid Leak.

What causes transmission to run hot?

Most transmission problems are a result of overheating. … Old, worn out, or burned fluid will cause the transmission to run hot. Transmission slipping is another hint that the fluid is low and old. A defective solenoid can cause the transmission to run hot.

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How long does it take for transmission fluid to get hot?

After about 15 miles of driving it should be fully warmed up.

How long should I let my transmission cool down?

Pull over, put it in Neutral, and rev the engine (or use your fast idle). About 5 minutes should do it.

Is it OK to slightly overfill transmission fluid?

A slightly overfilled gearbox will not be damaged if quantities such as 0.3 litres/0.3 quarts are involved. If you overfill your transmission with one liter or more above the max mark, your transmission could be damaged. Transmission fluid performs several functions in your vehicle.

Can a transmission run too cool?

The ideal temperature for it is 175 degrees, plus or minus 25 degrees, and when the transmission gets below zero degrees, it gets too thick. The fluid can also fail to lubricate parts when it is too cold, wearing parts down unnecessarily. … If water is in it when cold, it will freeze at 32 degrees Fahrenheit.

What does it mean when your transmission fluid smells burnt?

Overheated or low transmission fluid could be a potential source of this burning smell. Fresh transmission fluid tends to smell sweet or tart. When that smell turns burnt, your transmission fluid has broken down and the system is burning too hot, leading to an increase in friction and corrosive activity in the engine.

Can too much transmission fluid cause overheating?

The proper amount of fluid also keeps a constant level of pressure inside the transmission. However, when you have too much transmission fluid, the pressure builds within the transmission. … Second, because the gearbox is not fully lubricated, your transmission will start to overheat.

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Can a bad thermostat cause transmission problems?

If the thermostat is stuck open

Temperature gauge reads lower than normal. Heater doesn’t work. Automatic transmission has trouble shifting into higher gears. Fuel economy drops noticeably.

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