This procedure covers the replacement of the radiator cap on a 2018-2024 Toyota Camry with the 2.5L I4 engine, a simple maintenance task requiring minimal disassembly.

Warnings

Tools required

Parts

• Radiator cap × 1 — Toyota OEM 16401-0T012 or equivalent

Preparation

1. Ensure the engine has been off for at least 2 hours and is completely cool to the touch
2. Park the vehicle on level ground and engage the parking brake
3. Have a shop towel ready to catch any residual coolant

Procedure

1. 1

   Locate the radiator cap
   Open the hood and secure it with the prop rod. The radiator cap is located on the top of the radiator on the passenger side of the engine bay. It is a black or silver cap with pressure relief markings.
2. 2

   Release residual pressure
   Place a shop towel over the radiator cap. Slowly turn the cap counterclockwise to the first stop (approximately 1/4 turn) and pause. This allows any residual pressure in the cooling system to escape safely. Listen for a hissing sound which indicates pressure release.
3. 3

   Remove the old radiator cap
   After pressure has been fully released and no hissing sound remains, press down on the cap while continuing to turn counterclockwise until it can be lifted off. Remove the cap and set it aside.
4. 4

   Inspect the radiator filler neck
   Examine the radiator filler neck for cracks, corrosion, or damage. Check that the sealing surface is clean and smooth. Wipe away any debris or dried coolant with a clean shop towel. Also verify the coolant level is visible in the radiator neck (should be near the top).
5. 5

   Install the new radiator cap
   Position the new radiator cap on the radiator filler neck, aligning any tabs or guides. Press down firmly and turn clockwise until it stops at the locked position. You should feel a positive click or resistance when fully seated.

Reassembly

1. No additional reassembly required for this procedure

Verification

• Verify the radiator cap is fully seated and locked in place by attempting to turn it further clockwise
• Start the engine and allow it to reach operating temperature while monitoring for coolant leaks around the radiator cap
• After the engine cools, recheck that the cap remains properly seated and the cooling system has maintained proper coolant level

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