Inverter Cooler Water Pump compatible with Lexus RX400H
Features 100% leak and durability testing with a plastic RN body and iron bottom construction.
Key facts
- Part type
- Inverter Cooler Water Pump
- Type
- Aftermarket replacement
Compatibility matrix
Only models verified by our team are listed| Parts for | Model | This part |
|---|---|---|
| Lexus | Lexus RX400H | Fits |
Only the models listed above have a confirmed catalog fit. If yours is absent, compatibility is unknown, not ruled out. Compare the exact model identifier and any published dimensions or connectors before ordering.
Where to find your model number
- Lexus: Use your 17-character VIN. It's on the driver-side dashboard at the base of the windshield and on the driver's door jamb sticker. The year is in the 10th character. Also check your registration or the owner's manual.
General manufacturer guidance: exact label position can vary by model.
Inverter Cooler Water Pump specifications
- Material
- Metal, Plastic (RN)
- Drive Type
- Electric
- Part Number
- G9040-48080, G904048080, WQT222
Installation guide - Replacing a cooling system part
General guidance for this part type - always follow your device manual- Drain pan
- Pliers for hose clamps
- Correct coolant for your vehicle
- This is an advanced job: follow your vehicle's service manual, or have a qualified mechanic fit it.
- Recheck the coolant level after the first few drives as trapped air works out.
- 1Make it safe. Engine off and completely cold. Never open the radiator or reservoir cap on a hot engine.
- 2Drain the coolant. Open the drain plug or remove the lower hose into a drain pan, and keep coolant away from pets.
- 3Remove the old part. Undo the hose clamps and bolts, noting each hose's position, and clean the old gasket off the mating surfaces.
- 4Fit the new part. Use the new gasket or O-ring, tighten bolts evenly to your manual's values and refit hoses with their clamps.
- 5Refill and bleed. Refill with the coolant your manual specifies, run the engine with the heater on full to purge air, top up, and check for leaks once cool.
This is general guidance for the part type, not a model-specific procedure. If the part does not fit without force, stop and recheck compatibility.
Maintenance check
Signs it's time to replace
- 01Engine overheats or temperature gauge swings
- 02Coolant leaking near the front of the engine
- 03Heater blows cold air
- 04Whining or grinding noise from the pump area
More parts for Lexus RX400H
See all Lexus RX400H parts
12 month warranty on every part
Every part we sell is covered for 12 months from delivery. If it fails in normal use, we replace it or refund you , claim it straight from your order page.
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Questions & answers
+Which models does this inverter cooler water pump fit?
Our team verified it for Lexus RX400H. The full list is in the compatibility table above.
+How do I make sure it fits my exact model?
Find the model number on your vehicle registration or VIN and compare it with the table above. Our fit guarantee covers verified models.
+What part numbers does it replace?
Listed reference numbers: G9040-48080, G904048080, WQT222. Compare them with the number on your old inverter cooler water pump.
+What is the inverter cooler water pump made of?
Listed material: Metal, Plastic (RN).
+Is it hard to install?
Install difficulty: Advanced · mechanical experience needed. Step by step instructions are on this page.
+How fast will it arrive?
This part is in stock in the USA: delivery within 3 to 8 business days, free shipping in the US.
+Is there a warranty?
Yes, a 12-month warranty is included, and you can extend it at checkout. Returns are accepted within 30 days.