2008-2015 Scion xB Cooling Fan Failure: Diagnosis, Replacement, and Part Guide
This guide covers how to diagnose a failing radiator fan on your Scion xB, understand critical compatibility warnings, and choose the right new or used replacement part.
- For 2008 models, you MUST verify the production date on the driver's door jamb; parts changed in April 2008.
- Engine overheating in stop-and-go traffic is the number one symptom of a failed cooling fan motor.
- It is often cheaper to buy a complete used OEM or new aftermarket fan assembly than a single new OEM motor.
- Before buying parts, always check the fan fuses and relays first, as these are common, inexpensive points of failure.
Symptoms of a Failing Cooling Fan Motor
A bad cooling fan motor will make itself known quickly, especially in warm weather or stop-and-go traffic. Here are the most common signs of failure:
- Engine Overheating at Idle: This is the most classic symptom. When the car is stopped, there is no natural airflow through the radiator. If the fans don't turn on to pull air through, the engine temperature will quickly rise. The temperature may return to normal once the car is moving at higher speeds.
- A/C Blows Warm Air When Stopped: The A/C system's condenser, which looks like a thin radiator, also needs airflow to dissipate heat. One of the fans is responsible for this. If it fails, the A/C system can't cool the refrigerant effectively, resulting in warm air from the vents when you're not moving.
- Fans Don't Spin: With the engine fully warmed up or the A/C turned on, you should be able to hear and see at least one of the fans running. If you pop the hood and see that both fans are stationary, there is a problem in the system.
- Loud or Grinding Fan Noise: The bearings inside the electric fan motor can wear out. When this happens, the fan may become noisy, making a grinding or whirring sound as it spins, or it may wobble visibly.
- Warning Lights: A failing fan can cause the engine to overheat, which will trigger the temperature warning light or Check Engine Light on your dashboard.
Known Issues, Recalls, and Compatibility Warnings
No Recalls for Cooling Fans
As of mid-2026, there are no active recalls from Toyota or the NHTSA specifically for the engine cooling fan motors or assembly on the 2008-2015 Scion xB. Any recalls for this vehicle pertain to other components like airbags or optional accessory brake kits.
Critical: The 2008 Production Date Split
Toyota used two different cooling fan designs for the 2008 model year. The changeover happened in March 2008. It is essential to verify your vehicle's production date before ordering a part.
- Vehicles built up to 03/2008 use a specific early-design assembly.
- Vehicles built from 04/2008 onwards use the more common assembly shared with all 2009-2015 models.
You can find your car's production date on the sticker located on the driver's side door jamb (the B-pillar). The date is usually in the top right corner of the label, formatted as MM/YY.
Diagnosing the Problem: A Step-by-Step Guide
If your fans aren't working, the motor isn't always the culprit. Follow these steps to find the source of the problem before buying parts.
- Check the Fuses: The first and easiest check. Look in your owner's manual for the location of the fuse box and the specific fuses related to the radiator fan (often labeled "RDI" or similar). A blown fuse is a simple fix, but if it blows again, it indicates a deeper electrical problem, like a seized fan motor drawing too much current.
- Check the Relays: The fan motors are high-power devices, so they use relays (small electromagnetic switches) to turn on and off. The Scion xB has relays for the cooling fans in the under-hood fuse box. You can test a relay by swapping it with an identical one from a non-critical system, like the horn. If the fan starts working (and the horn stops), you've found the bad relay.
- Test the Fan Motor Directly: If the fuses and relays are good, the next step is to see if the motor itself has failed. Disconnect the electrical connector at the fan motor. Using jumper wires, carefully apply 12V power directly from the car battery to the two pins in the motor's connector. If the fan spins, the motor is good, and the problem lies in the wiring or the coolant temperature sensor. If the fan does not spin, the motor is dead and needs to be replaced.
Buying a Used 2008-2015 Scion xB Cooling Fan
A used OEM cooling fan assembly is an excellent, cost-effective alternative to expensive new parts or lower-quality aftermarket units. Here’s what to look for.
Why Used OEM?
Original Equipment (OEM) fan motors are built to a high standard for durability and quiet operation. Many aftermarket fan assemblies use cheaper motors that can be noisier and may not last as long. Since the entire assembly is a simple bolt-in part with no programming required, a tested, low-mileage used OEM unit offers the best balance of quality and value.
Physical Inspection Checklist
- Spin the Blades by Hand: With the unit unplugged, spin each fan blade. They should spin freely and smoothly with minimal resistance. If you feel any grinding, notchiness, or excessive wobble, the motor bearings are worn out.
- Inspect the Shroud: Check the entire plastic shroud for cracks, especially around the mounting points. A broken mounting tab can cause vibrations and noise.
- Check the Connectors: Look closely at the electrical connectors on the motors. The plastic should not be melted or discolored, and the metal pins inside should be clean and free of corrosion.
- Look for Damage: Inspect the fan blades for any cracks or missing pieces. A damaged blade will be out of balance and can cause severe vibration.
Cross-Compatibility with Other Models
The individual fan motors (not the complete assembly) are shared with other Toyota/Scion models. This can expand your search when looking for a used part.
- 2011-2016 Scion tC: The left (16363-28390) and right (16363-28400) fan motors are identical to those used in the Scion xB.
- 2010-2015 Toyota Prius: Some fan motors and blades are shared with the Prius, but not all. For example, motor 16363-37010 and blade 16361-28360 are listed as compatible with both. Always verify part numbers before purchasing.
The complete fan assembly with the shroud is specific to the Scion xB due to its unique shape and mounting points.
Replacement Overview
Replacing the cooling fan assembly is a straightforward job for a DIY mechanic with basic tools.
- Difficulty: 2 out of 5
- Estimated Time: 1 - 1.5 hours
- Tools Needed: Ratchet and socket set, pliers, flathead screwdriver, drain pan.
Simplified Steps:
- Disconnect the negative battery terminal.
- Place a drain pan under the radiator and partially drain the coolant using the petcock at the bottom. You only need to drain enough so the upper radiator hose is empty.
- Use pliers to release the clamp and remove the upper radiator hose from the radiator.
- Remove any plastic engine covers or air intake snorkels that block access to the top of the fan shroud.
- Disconnect the electrical connectors for both fan motors.
- Unbolt the fan shroud from the radiator (typically two bolts at the top).
- Carefully lift the entire fan assembly straight up and out of the engine bay, being mindful not to damage the radiator fins.
- Installation is the reverse of removal. Afterwards, top off the coolant and properly bleed the air from the cooling system.
Pro Tip: It is often cheaper to buy a complete new aftermarket or used OEM fan assembly than it is to buy a single new OEM fan motor. The OEM motor part number 16363-28390 can cost over $250, while a complete quality aftermarket assembly can be found for under $200.
Cost Comparison
| Part Type | Estimated Cost |
|---|---|
| New OEM Assembly | $115 - $170 |
| New Aftermarket Assembly | $95 - $200 |
| Used OEM Assembly | $75 - $125 |
| Shop Labor Cost | $150 - $300 |
Frequently Asked Questions (FAQ)
Do I need to replace both fans if only one failed?
You can replace just the single failed motor, but it's often more practical and cost-effective to replace the entire assembly. Both motors have the same amount of wear, so if one has failed, the other may not be far behind. Furthermore, a complete new aftermarket assembly is often cheaper than one new OEM motor.
Can I just replace the motor or do I need the whole assembly?
Yes, the individual motors can be unbolted from the shroud and replaced. This is a good option if you source a used motor. However, as noted, buying a complete assembly (new aftermarket or used OEM) is usually a better value than buying a new OEM motor by itself.
What happens if I ignore a bad cooling fan?
Ignoring a failed cooling fan will lead to engine overheating. Continuous overheating can cause catastrophic engine damage, including a warped cylinder head or a blown head gasket, which can result in repairs costing thousands of dollars.
How do I check my 2008 Scion xB's production date?
Open the driver's door and look for the black and white sticker on the body of the car (the B-pillar). The manufacturing date will be printed on this label, typically in the upper right corner, in a MM/YY format (e.g., 04/08). This is essential for getting the correct part for a 2008 model.
Technical Specifications
OEM Part Numbers: 16711-28400 (Complete Fan Assembly/Shroud) 16361-28350 (Fan Blade) 16361-28360 (Fan Blade) 16363-28390 (Left Fan Motor) 16363-28400 (Right Fan Motor)
Vehicle utilizes a dual-fan assembly mounted in a single shroud. Each motor is a 12V electric motor with a 2-pin connector.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Scion xB:
- 🛍️ Shop This Part
- Symptoms of a Failing Cooling Fan Motor
- Known Issues, Recalls, and Compatibility Warnings
- No Recalls for Cooling Fans
- Diagnosing the Problem: A Step-by-Step Guide
- Buying a Used 2008-2015 Scion xB Cooling Fan
- Why Used OEM?
- Physical Inspection Checklist
- Cross-Compatibility with Other Models
- Replacement Overview
- Cost Comparison
- Frequently Asked Questions (FAQ)
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