This procedure covers the removal and replacement of the radiator cap on a 2012-2018 Jeep Wrangler with the 3.6L V6 engine.

Warnings

Tools required

Parts

• Radiator cap × 1 — Use OEM specification

Preparation

1. Park the vehicle on a level surface and ensure the engine is completely cool to the touch
2. Open the hood and locate the radiator cap on top of the radiator at the front of the engine bay

Procedure

1. 1

   Verify Engine Temperature
   Touch the radiator and upper radiator hose to confirm they are cool. If there is any heat present, wait longer before proceeding.
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 wait for any residual pressure to escape. Listen for a hissing sound, which indicates pressure release.
3. 3

   Remove the Old Radiator Cap
   Once pressure is fully released, press down on the cap while continuing to turn counterclockwise until it can be lifted off. Remove the cap and inspect the rubber seals for cracks, deterioration, or damage.
4. 4

   Inspect the Radiator Filler Neck
   Examine the radiator filler neck for damage, cracks, or corrosion. Wipe away any debris or dried coolant residue with a clean shop towel. Ensure the sealing surface is clean and smooth.
5. 5

   Install the New Radiator Cap
   Place the new radiator cap on the filler neck, ensuring it is properly aligned. Press down firmly and turn clockwise until you hear or feel it click into the locked position. The cap should seat fully against the filler neck.

Reassembly

1. No disassembly was required for this procedure

Verification

• Verify the radiator cap is fully seated and locked by attempting to turn it slightly; it should not rotate freely
• Start the engine and allow it to reach normal operating temperature while monitoring for coolant leaks around the cap
• After a short test drive, re-check the cap to ensure it remains properly secured

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