Womala Thermostat AJ813902 for Jaguar XJ XE

Product Overview

The Thermostat Unit AJ813902 (also referenced as AJ814048) is an OE-grade engine cooling component engineered for the 3.0L V6 supercharged petrol engine in select for Jaguar and for Land Rover vehicles. This complete assembly integrates the thermostat, housing, and integrated temperature sensor into a single unit, regulating coolant flow to maintain optimal engine operating temperature.AJ814048 is the current replacement part, superseding AJ813902, AJ813986, C2Z29980, and C2Z31236.

⚠️ Important: This thermostat unit is specifically for 3.0L V6 supercharged petrol engines — it is not compatible with diesel or other engine variants. Confirm your engine type before ordering.

Key Features

• Complete assembly with sensor — includes thermostat, housing, and integrated temperature sensor

• 96°C opening temperature — factory-calibrated for the 3.0L V6 supercharged petrol engine

• OE-grade quality — available as Genuine Jaguar, Wahler, Motorad, Borg & Beck, and other quality alternatives

• Upgraded aluminium version available — replaces failure-prone factory plastic housing for enhanced durability

• Direct-fit replacement — matches factory mounting points and coolant hose connections

OE Cross-Reference

💡 Supersession Note: AJ814048 is the current replacement part. All listed numbers refer to the same thermostat unit for 3.0L V6 supercharged petrol applications.

Technical Specifications

Jaguar Applications

Land Rover Applications

VIN Notes: XF Sportbrake (X260) — VIN from JCY73210 to JCY73209; F-PACE 3.0L V6 — from VIN HA000001.

⚠️ Important: This thermostat unit is confirmed for the 3.0L V6 supercharged petrol engine in the models listed above. VIN cut-offs apply on certain applications — confirm your VIN before ordering.

Signs of Failure

• Engine overheating — thermostat stuck closed, restricting coolant flow

• Engine running too cool — thermostat stuck open, preventing proper warm-up

• Coolant leaks — visible drips from the thermostat housing area

• Erratic temperature gauge readings — unstable temperature indication

• Poor fuel economy — engine running below optimal temperature

💡 Known Failure Issue: The factory plastic thermostat housing on the 3.0L V6 supercharged petrol engine is prone to cracking and warping under heat and pressure. If not addressed promptly, coolant loss can cause catastrophic engine damage. Upgraded aluminium versions are available for enhanced durability.

Critical – Verify Your VIN Before Ordering

Thermostat units are VIN-, engine-, and model-year-specific. Provide your VIN – our team confirms exact compatibility before dispatch. We cannot accept returns for misordered parts without VIN verification.

💡 Installation Tip: Professional installation recommended. When replacing the thermostat, inspect all cooling system hoses and connections for wear. It is recommended to replace the water pump and oil cooler connector at the same time for a complete cooling system service. Refill with OEM-specified coolant at the correct mixture ratio and bleed the cooling system thoroughly to remove air pockets. Consider upgrading to the aluminium version for enhanced durability.

Why Choose Us

Contact us for bulk orders or VIN‑checked quotes.

Specifications subject to change; images for reference only.Aftermarket replacement – not affiliated with Jaguar Land Rover.

Frequently Asked Questions

• Extensive Industry Experience: 13 years specializing in Auto Parts auto parts with precise product matching and technical solutions.
• Quality Assurance: 10-stage quality inspection process including durability testing, surface roughness analysis, and dimensional verification.
• Manufacturing Excellence: 15,000㎡ production base with 10,000+ SKUs in inventory for fast order fulfillment.
• Strategic Partnerships: Collaborations with 50+ factories including suppliers to international brands like Womala and Hella.