cooling

Radiator Cap

for 2017 Jeep Wrangler 3.6L V6 · 4WD

Editorial review:Chris Hackleman — Master Technician · 20+ years · Jeff Moore — Master Mechanic · 20+ years

Difficulty

Easy

Time

6 min

Tools

Steps

✓Expert-verified. Personally reviewed and approved by OLP's master technicians (Chris Hackleman & Jeff Moore — 20+ years each). Always follow the vehicle's factory service information and torque specs.

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

Warnings

⚠️Never remove the radiator cap when the engine is hot. The cooling system is pressurized and can spray boiling coolant, causing severe burns.

⚠Ensure the engine has been off for at least 30 minutes before removing the cap to allow coolant temperature and pressure to decrease.

Tools required

Shop towel or ragEssential

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Parts

Radiator cap × 1 — Use OEM specification

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Preparation

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

Procedure

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
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
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
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
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

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