Should You Check Your Transmission Fluid With the Engine Running or Off?

Checking your transmission fluid is a crucial part of maintaining your vehicle’s health. However‚ a common question arises⁚ Should you check it with the engine running or off? The answer is simple⁚ Always check your transmission fluid with the engine off.

Why Checking With the Engine Running Is a Bad Idea

  • Inaccurate Readings⁚ When the engine is running‚ the transmission fluid is under pressure‚ which can lead to an inaccurate reading of the fluid level. This is because the fluid is forced into the dipstick tube‚ making it appear higher than it actually is.
  • Safety Hazard⁚ Checking the transmission fluid with the engine running poses a safety risk. Hot fluid can splash and burn you‚ and there’s a chance of coming into contact with moving parts.
  • Fluid Contamination⁚ The dipstick tube can become contaminated with dirt and debris when the engine is running‚ leading to inaccurate readings and potentially damaging your transmission.

The Proper Way to Check Transmission Fluid

  1. Park Your Car on a Level Surface. This ensures an accurate reading.
  2. Shift Your Transmission to “Park” or “Neutral.” This allows the fluid to settle properly.
  3. Wait for the Transmission to Cool Down. This is especially important if you’ve been driving. Hot fluid can expand‚ leading to an inaccurate reading.
  4. Locate the Dipstick. It’s usually located near the back of the engine. It will have a handle or ring to pull it out.
  5. Wipe the Dipstick Clean. Use a clean cloth to remove any dirt or debris from the dipstick.
  6. Insert the Dipstick Fully. Then pull it out and check the fluid level.
  7. Check the Fluid Level. Most transmissions have markings on the dipstick indicating the “Full” and “Add” levels. The fluid should be within these markings.

Understanding the Color and Smell of Transmission Fluid

While checking the level is important‚ also pay attention to the color and smell of the fluid. Healthy transmission fluid should be a bright red or pink color. If it’s dark brown or black‚ it needs to be changed. A burnt smell indicates that the fluid is overheated and damaged.

Conclusion

Checking your transmission fluid with the engine off ensures accurate readings and a safe experience. Remember to check the fluid level‚ color‚ and smell regularly to maintain the health of your transmission. If you notice any issues‚ consult a mechanic for professional advice.

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