The radiator fan relay is located below the left front headlamp module Radiator Fan Relay The headlamp module must be removed to access the relay.

The cooling fan control module in your vehicle is located at the front left of the engine compartment next to the radiator.

Where is the fuse for radiator fan? The cooling fan relay is normally located in either the underhood fuse and relay center or mounted to the electric fan assembly behind the radiator.

Diagnostic Trouble Code P0480 is defined as Cooling Fan 1 Control Circuit Malfunction. It indicates that PCM has detected an incorrect amount of voltage (high or low) in the electric cooling fan control circuit.

You can tell if the fuse is blown because the fan will not even attempt to turn or make any noise. If you ‘fling’ the blades with your hand, still nothing (sometimes that starts them when they are sticking). But if the fan makes a noise like it is trying to start then it isnt the fuse.

This typically takes about 15-20 minutes for the engine to reach the right temperature for the radiator fan to turn on in older cars. If there’s a problem with the engine’s temperature, then this can damage the radiator.

An electric fan SHOULD NOT run all the time. The fan turning on is normal and a consequence of the hot coolant, not a cause. The coolant may not be moving due to a water pump problem, blockage in the radiator or hoses, or a stuck valve, i.e., the “thermostat” in the coolant line.

It is possible that this problem of your car’s fans constantly running is some sort of mechanical or electrical error from a poor sensor or other component. There are temperature sensors and some cars have separate sensors for the gauge itself. The fan can be shut off when the engine temperature warrants.

There are two fan relays (high speed and low speed) on the 2004 Jeep Grand Cherokee in the PDC (power distribution center) under the hood on the passenger side.

REMOVAL

1. Gently lay fan into shroud.
2. Disconnect the electrical connector for the electric fan, then disconnect connector from shroud.
3. Disconnect transmission cooler line from retaining clip on fan shroud.
4. Remove the mounting bolts form the shroud.
5. Remove the radiator mounting bolts.

Locate the clutch, which is bolted to the back of the fan. Remove the four clutch mounting bolts on the back of the clutch by turning them counterclockwise with the wrench. Remove the fan and clutch assembly from the engine compartment.

To confirm the diagnosis, start with this simple test: Spin the fan as hard as you can on an engine that has not been started that day. If the fan rotates more than five times, you can bet the clutch is bad. You should feel some resistance and the fan may spin up to three times, depending on the ambient temperature.

If the fan cannot be rotated by hand or if there is a rough grating feel as the fan is turned, the clutch should be replaced.

To test the fan clutch, get the engine to operating temp, shut it off, then try to spin the fan as hard as you can, if it can make a full revolution or more, it is time to replace it.

about 170°F

Usually a bad fan clutch will sound like the fan blades rubbing against the radiator type noise. Or a rattle. A faulty fan clutch that leaves the fan permanently engaged will not only cause a noisy engine, but can also cause a decrease in performance.

Usually a bad or failing fan clutch will produce a few symptoms that can alert the driver of a potential issue.

• Vehicle overheating.
• Excessively loud cooling fans.
• Decrease in power, acceleration, and fuel efficiency.