2008-2017 Dodge Viper Radiator Fan Motor: A Guide to Overheating Fixes

Symptoms of a Failing Fan Motor

A bad radiator fan motor will make itself known quickly, especially in traffic or on warm days. The V10 engine relies heavily on these fans to stay cool when there's no air rushing through the grille. Here are the most common signs of failure:

• Engine Overheats at Idle: This is the number one symptom. If you notice the temperature gauge climbing in stop-and-go traffic but returning to normal at highway speeds, a fan motor is the likely culprit. The fans are supposed to compensate for the lack of natural airflow at low speeds.
• A/C Blows Warm Air at Stops: The fan also pulls air across the A/C condenser. If the fan isn't working, the A/C system can't shed heat effectively, and you'll get warm air from the vents until you start moving again.
• Fan Doesn't Spin: With the engine fully warmed up (or with the A/C on), you should be able to hear and see the fans running. If you pop the hood and see a stationary fan when the engine is hot, the motor has likely failed.
• Grinding or Wobbling Noises: A worn-out bearing inside the fan motor can produce a grinding or rattling sound before it fails completely. You might also see the fan blades wobble as they spin.
• Check Engine Light: Severe overheating will trigger a check engine light or a specific coolant temperature warning on your dashboard.

Diagnosing the Rad/Cond Fan Motor

Before you replace the motor, it's important to confirm it's the true cause of the problem. The issue could also be a simple fuse, relay, or wiring problem.

1. Visual Inspection: Look for any obvious damage, like cracked or broken fan blades, or melted plastic on the motor's housing. Forum users have reported fan blades breaking, which causes a severe imbalance.
2. Check Fuses and Relays: Consult your owner's manual to locate the fuse and relay for the radiator fans. A blown fuse is a simple fix, but if it blows again, it indicates a deeper electrical problem, possibly a seized motor drawing too much current. You can test a relay by swapping it with an identical one from a non-critical system (like the horn) to see if the fan starts working.
3. Test the Motor Directly: This is the most definitive test. Disconnect the fan motor's electrical connector. Use a pair of jumper wires to connect the motor's terminals directly to a 12V battery. If the fan spins up smoothly, the motor is good, and the problem lies elsewhere in the circuit (like the temperature sensor or wiring). If it doesn't spin, spins slowly, or makes grinding noises, the motor is bad and needs to be replaced.

Known Issues, TSBs, and Recalls

As of mid-2024, there are no specific recalls or Technical Service Bulletins (TSBs) from Dodge or the NHTSA for the radiator fan motors on the 2008-2017 Dodge Viper. Most issues reported by owners are related to standard wear and tear. The high-heat environment of the Viper's engine bay puts significant stress on these electric motors over time, leading to eventual failure. Some owners on forums have noted that the stock fans can struggle in very hot climates with extended idling, but for most stock applications, a healthy OEM system is sufficient.

Buying a Used Rad/Cond Fan Motor: A Buyer's Guide

A recycled OEM fan motor is an excellent, cost-effective alternative to an expensive new dealer part or a questionable aftermarket unit. For a critical part like this on a Viper, OEM quality provides peace of mind. Here’s what to look for:

Physical Inspection

• Check the Blades: Carefully inspect every fan blade for cracks, chips, or stress marks, especially where the blade meets the hub. A broken blade can cause destructive vibrations.
• Spin it by Hand: The fan should spin freely with a smooth, consistent resistance. Any grinding, clicking, or excessive looseness (wobble) indicates a bad bearing, and you should pass on the part.
• Inspect the Connector: Look at the electrical plug on the motor. The pins should be clean and straight, with no signs of corrosion, melting, or burning.
• Examine the Housing: Check the motor's plastic or metal casing for cracks, heat damage, or signs of previous repair.

Compatibility and Part Numbers

The 2008-2017 Viper uses a dual-fan setup. While the initial data suggests one motor part number fits both sides, some parts suppliers list separate part numbers for the left (driver) and right (passenger) side motors. It is critical to verify the exact part number you are replacing.

• Verified Motor Part Numbers: 05137714AA (often listed for the Left/Driver side), 68034687AA.
• Verified Assembly Part Number: 68050129AA (includes shroud and fans).

Replacement Overview & Difficulty

• Difficulty Rating: 3 out of 5 (Moderate)
• Estimated Time: 1.5 - 2.5 hours
• DIY Feasible: Yes, for those comfortable with basic mechanical work.

Replacing the fan motor involves removing the entire fan shroud assembly from the vehicle. While you don't need to remove the radiator, you will need to make some room. The general steps are as follows:

1. Disconnect the negative battery terminal.
2. Drain a small amount of coolant from the radiator petcock so the upper radiator hose can be removed without a major spill.
3. Disconnect the upper radiator hose from the radiator.
4. Unplug the electrical connectors for both fan motors.
5. Remove the bolts securing the fan shroud assembly to the radiator.
6. Carefully lift the entire fan assembly out of the engine bay.
7. Once removed, you can unbolt the individual failed motor from the shroud and install the replacement.

Installation is the reverse of removal. Be sure to refill the lost coolant and properly bleed any air from the system afterward.

Cost Comparison

Prices can vary, but here is a general cost expectation for the Dodge Viper radiator fan motor:

Frequently Asked Questions (FAQ)