why is my Toyota Highlander XU70 (2020-Present) transmission leaking fluid

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Allow the engine to cool if it has been running.
• Disconnect the battery to ensure safety.

2. Identify the Leak Source

• Sub-step 1: Clean the transmission pan and surrounding area with a degreaser to remove old fluid.
• Sub-step 2: Start the engine and let it run to help identify the leak's source by observing fluid seepage.
• Sub-step 3: If the leak is from the transmission pan, proceed to replace the gasket.

3. Replace Transmission Pan Gasket

• Sub-step 1: Drain the transmission fluid by removing the drain plug or transmission pan bolts. Collect the fluid in a clean container.
• Sub-step 2: Remove the transmission pan by loosening the bolts and gently prying it off if necessary.
• Sub-step 3: Clean the mating surfaces of the transmission and the pan thoroughly.
• Sub-step 4: Install a new gasket onto the transmission pan.
• Sub-step 5: Reattach the pan and tighten the bolts to the manufacturer's specified torque (typically 10-12 ft-lbs).
• Sub-step 6: Refill the transmission with the appropriate type and amount of fluid (refer to the owner's manual).

4. Replace Seals (If Applicable)

• Sub-step 1: If the leak is from the input or output shaft seals, remove the driveshaft or any components obstructing access.
• Sub-step 2: Use a seal puller to remove the worn seals.
• Sub-step 3: Lubricate the new seals with transmission fluid and install them carefully to avoid damage.
• Sub-step 4: Reassemble any components removed during the process.