Should engine be running when checking transmission fluid?

Should engine be running when checking transmission fluid?

Introduction

When it comes to checking transmission fluid, there is often a debate about whether the engine should be running or not. Some argue that the engine needs to be running to get an accurate reading, while others believe it should be off. In this article, we will delve into this topic and explore the reasons behind both perspectives.

Checking Transmission Fluid with the Engine Running

Reasons for checking with the engine running: One school of thought suggests that checking the transmission fluid with the engine running provides a more accurate reading. The rationale behind this is that the fluid needs to be circulated throughout the transmission to get an accurate measurement. Running the engine helps to ensure that the fluid is properly distributed, allowing for a more precise reading.

Procedure for checking with the engine running: To check the transmission fluid with the engine running, follow these steps:

1. Park the vehicle on a level surface and engage the parking brake.
2. Start the engine and let it idle for a few minutes to allow the transmission fluid to warm up.
3. Locate the transmission dipstick, which is usually labeled and located near the engine.
4. Pull out the dipstick, wipe it clean, and reinsert it fully.
5. Pull out the dipstick again and observe the fluid level. It should be within the designated range, typically indicated by “full” and “add” marks on the dipstick.
6. Check the fluid’s color and consistency. It should be transparent and have a reddish hue. If it appears dark, dirty, or has a burnt smell, it may indicate a problem and require further inspection.

Checking Transmission Fluid with the Engine Off

Reasons for checking with the engine off: On the other hand, some argue that checking the transmission fluid with the engine off is a safer approach. The primary concern is the potential risk of injury from moving parts when the engine is running. By turning off the engine, there is no risk of accidental contact with belts, pulleys, or other rotating components.

Procedure for checking with the engine off: To check the transmission fluid with the engine off, follow these steps:

1. Park the vehicle on a level surface and engage the parking brake.
2. Allow the engine to cool down completely to avoid any potential burns.
3. Locate the transmission dipstick, which is usually labeled and located near the engine.
4. Pull out the dipstick, wipe it clean, and reinsert it fully.
5. Pull out the dipstick again and observe the fluid level. It should be within the designated range, typically indicated by “full” and “add” marks on the dipstick.
6. Check the fluid’s color and consistency. It should be transparent and have a reddish hue. If it appears dark, dirty, or has a burnt smell, it may indicate a problem and require further inspection.

Conclusion

In conclusion, both methods of checking transmission fluid have their merits. Checking with the engine running provides a more accurate reading as the fluid is properly circulated. However, checking with the engine off eliminates the risk of injury from moving parts. Ultimately, the decision of which method to use may depend on personal preference, the vehicle’s manufacturer recommendations, or specific circumstances. It is essential to consult the vehicle’s owner’s manual for the manufacturer’s instructions on checking transmission fluid.

References

– transmissionrepaircostguide.com
– caranddriver.com
– popularmechanics.com