OMIX 17103.06 Coolant Overflow Reservoir Bottle for 2007-2011 Jeep Wrangler JK

Vehicle Fitment

• 2007-2011 Jeep Wrangler JK 2-Door (3.8L V6 Engine Only)
• 2007-2011 Jeep Wrangler Unlimited JKU 4-Door (3.8L V6 Engine Only)

Fitment Notes

• Fits 3.8L V6 engine applications only - does not fit 3.6L Pentastar V6 Wrangler JK models (2012+)
• Replaces OE reference: 55056542AE
• Direct-fit replacement - installs to factory mounting points without modification
• Sold individually

Features

• OE-replacement coolant overflow reservoir stores expanding coolant as the engine heats up and returns it to the radiator as it cools, maintaining correct coolant system pressure and level
• Includes tethered cap to prevent cap loss and ensure secure, consistent sealing of the reservoir opening
• Includes inlet hose for complete, ready-to-install assembly - no separate hose sourcing required
• Durable plastic construction engineered to withstand engine bay heat cycles and coolant chemistry over the long term
• Direct-fit OE-style replacement engineered to original JK specifications
• Backed by OMIX's Limited 5-Year Manufacturer's Warranty

Specifications

• Part Number: 17103.06
• Component Type: Coolant Overflow / Expansion Reservoir Bottle
• Material: Plastic
• Cap Type: Tethered
• OE Reference: 55056542AE
• Package Dimensions: 20" L x 9" W x 5" H
• Warranty: Limited 5-Year
• UPC: 804314267353
• Sold: Individually

Included Components

• 1x Coolant Overflow Reservoir Bottle
• 1x Tethered Cap
• 1x Inlet Hose

Product Description

The OMIX 17103.06 is a direct-fit OE-replacement coolant overflow reservoir for the 2007-2011 Jeep Wrangler JK and JKU equipped with the 3.8L V6 engine. The coolant overflow bottle is a pressurized expansion tank that stores excess coolant as it expands with engine heat and returns it to the cooling circuit as the engine cools - maintaining consistent coolant system pressure and protecting against air ingestion into the system. A cracked, leaking, or missing reservoir results in coolant loss, low coolant warnings, and eventual overheating.

This replacement kit includes the reservoir bottle, tethered cap, and inlet hose - everything needed for a complete bolt-on replacement in one purchase. The tethered cap design keeps the cap attached to the bottle and ensures it is never misplaced. This part is specific to the 3.8L engine found in 2007-2011 JK models; it is not compatible with the 3.6L Pentastar V6 that replaced it in 2012. Backed by OMIX's Limited 5-Year Manufacturer's Warranty.