The Radiator Coolant Expansion Tank – Jaguar XF / XJ (OEM 4R838A080AC) is a direct-fit coolant reservoir designed to replace the original overflow tank on Jaguar XF (X250) and Jaguar XJ (X351) models. This expansion tank collects excess engine coolant from the radiator as it warms and expands, then feeds it back into the system as the engine cools — helping maintain stable coolant levels and pressure control in the cooling system. Maintaining proper coolant circulation is essential for preventing overheating, engine damage and cooling system failure on petrol or diesel Jaguar engines.

OEM Number: 6W838D065AB, 6W838D066AA, XR850837, C2P17700, JDE34572, 4R838A080AC, 4R838A080AB, 4R838A080AE, 4R838A080AD, 4R838101AB
 
COOLANT EXPANSION TANK FOR JAGUAR XF X250 XJ X351 2.7 3.0 C2Z11668 BRAND NEW

Quantity : 1

Make	Model	Variant	Type	Engine	Chassis	Year
Jaguar	XF	Diesel Estate	3.0 D	2993cc 177KW 241HP 306DT(AJTDV6)	RWD -- X250	2012-2014
Jaguar	XF	Diesel Estate	3.0 D	2993cc 202KW 275HP 306DT(AJTDV6)	RWD -- X250	2012-2014
Jaguar	XF	Diesel Saloon	2.7 D	2720cc 152KW 207HP 7G(AJTDV6)	RWD I X250	2008-2015
Jaguar	XF	Diesel Saloon	3.0 D	2993cc 155KW 211HP 306DT(AJTDV6)	RWD I X250	2009-2015
Jaguar	XF	Diesel Saloon	3.0 D	2993cc 177KW 241HP 306DT(AJTDV6)	RWD I X250	2009-2015
Jaguar	XF	Diesel Saloon	3.0 D	2993cc 202KW 275HP 306DT(AJTDV6)	RWD I X250	2009-2015
Jaguar	XF	Petrol Saloon	3.0	2967cc 175KW 238HP FG(AJV6)	RWD I X250	2008-2015
Jaguar	XJ	Diesel Saloon	3.0 SDV6	2993cc 202KW 275HP 306DT(AJTDV6)	RWD -- X351	2009-2016
Jaguar	XJ	Diesel Saloon	3.0 SDV6	2993cc 221KW 300HP 306DT(AJTDV6)	RWD -- X351	2015-2024
Jaguar	XJ	Petrol Saloon	3.0 V6	2967cc 175KW 238HP AJV6(3.0 Liter)	RWD -- X351	2011-2024
Make	Model	Variant	Type	Engine	Chassis	Year

Our SKU: TJAG4R838A080AC_94 

All our Coolant Expansion Tank For Jaguar Xf I X250 Xj X351 2008-2016 3.0 D 4R838A080Ac are OEM quality and reliable after market car parts. This Coolant Expansion Tank For Jaguar Xf I X250 Xj X351 2008-2016 3.0 D 4R838A080Ac is specifically compatible with Jaguar: XF, XJ, .

Please use our make-model-year tool to check this part's compatibility with your vehicle. However, please note that our tool is for reference only and we recommend that you check the part number on your old unit prior to purchasing.

If you are still not sure about the compatibility of this part to your vehicle, please supply us with the VIN number or Reg number in our live chat or contact form! You can also find details on our purchasing & shipping guide here.

Key Benefits

• Direct OEM-Referenced Replacement: Built to match the original Jaguar part 4R838A080AC and associated references (e.g., 4R838A080AB/AD/AE, C2C39440, C2Z11668), ensuring correct fit and reliable performance without modification.

• Restores Cooling System Function: Keeps coolant levels balanced under varying temperatures, helping your engine run at optimal operating temperature and preventing overheating during heavy use or hot weather.

• Helps Prevent Coolant Loss: A worn, cracked or leaking expansion tank can cause coolant loss, low-coolant warnings and engine temperature issues — this replacement restores leak-free operation.

• Enhanced Durability: Made from robust plastic material designed to withstand engine-bay heat, pressure cycling and vibration for long-term use.

• Sensor-Ready Construction: Many aftermarket replacements support coolant level sensors and caps — making them compatible with vehicles that monitor coolant levels electronically.

Frequently Asked Questions (FAQs)

Q1: What does the coolant expansion tank do?
A: The expansion tank captures excess coolant as the engine heats up, helps regulate pressure, and sends the fluid back into the system as it cools — supporting stable engine temperatures.

Q2: Which Jaguar models is part 4R838A080AC compatible with?
A: It is commonly fitted to Jaguar XF (X250) 2.7D / 3.0D / 3.0 petrol vehicles from around 2008–2015, and Jaguar XJ (X351) 3.0 SDV6 petrol/diesel variants from approximately 2009–2019 — always verify fitment with your exact year and engine.

Q3: How do I know if my expansion tank needs to be replaced?
A: Typical signs include visible cracks or leaks in the tank, low-coolant warnings, overheating, coolant puddles under the car, or fluctuating temperature gauges — all of which suggest the reservoir isn’t containing coolant properly.

Q4: Does the tank include a cap and sensors?
A: Many aftermarket expansion tanks are supplied with cap and support for factory coolant level sensors, but always check the product details to confirm what’s included.

Q5: Is replacing the expansion tank difficult?
A: Replacement is a moderate DIY task involving draining some coolant, removing hoses and fittings, and securing the new tank — many mechanically inclined owners can do it, but professional installation ensures correct sealing and no air pockets in the cooling system.