Adding transmission fluid to your car is a crucial maintenance task. But a common question arises⁚ should you do it while the engine is running or off? The answer is a resounding no. Adding transmission fluid while the engine is running is a dangerous practice that can lead to serious issues.
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Why You Should Never Add Transmission Fluid While the Engine is Running
- Risk of Burns⁚ The transmission fluid is hot when the engine is running, and adding more while it’s hot can cause severe burns. You could get splashed or have the fluid spill out, leading to potential injuries.
- Incorrect Fluid Level⁚ When the engine is running, the transmission fluid is circulating, making it difficult to get an accurate reading of the fluid level. Adding fluid with the engine on can lead to overfilling, which can cause damage to the transmission.
- Air Entrapment⁚ Adding fluid while the engine is running can introduce air into the transmission system. This air can cause problems with the transmission’s operation, leading to slipping, jerking, or other issues.
- Fluid Overflow⁚ Overfilling the transmission with fluid can lead to a situation known as “fluid aeration.” This happens when the fluid is churned and whipped into a frothy state due to excess pressure. This frothy fluid can’t lubricate the transmission properly, leading to damage.
The Safe Way to Add Transmission Fluid
Always add transmission fluid with the engine off and the car parked on a level surface. Here’s the proper procedure⁚
- Warm Up the Transmission⁚ Start the engine and let it run for a few minutes to warm up the transmission fluid. This will help ensure that the fluid is at its proper operating temperature.
- Check the Fluid Level⁚ With the engine off, locate the transmission dipstick and pull it out. Wipe it clean with a rag and insert it back in fully. Then, pull it out again and check the fluid level. The fluid level should be within the “Full” mark on the dipstick.
- Add Fluid (if Needed)⁚ If the fluid level is low, carefully add fluid to the transmission until it reaches the “Full” mark.
Remember⁚
If you are unsure about how to check or add transmission fluid, it’s always best to consult a qualified mechanic. They can ensure that your transmission is properly maintained and prevent any potential issues.