The cooling fan relay is typically located in the engine bay’s power distribution center (PDC).
In the 2004 Grand Cherokee, the radiator cooling fan relay is usually inside the PDC, and some configurations may include a second relay for the condenser fan. The PDC lid carries a diagram labeling the relays, so you’ll identify the exact position by consulting that map with the hood open.
Locating the relay inside the Power Distribution Center
Use the following steps to identify and access the radiator/condenser fan relays within the engine bay’s fuse/relay box.
- Park on a level surface, set the parking brake, and open the hood to locate the engine bay’s large black fuse/relay box—the Power Distribution Center (PDC).
- Remove the PDC lid by releasing the clips; the underside usually has a layout diagram showing each relay and fuse.
- Look for relays labeled Radiator Fan, Radiator Fan Relay, FAN, or A/C Condenser Fan Relay. Some engines have one radiator fan relay and a second for the condenser fan; they’re typically side‑by‑side in the box.
- If the diagram is unclear or the labels differ, compare the relay’s connector shape and pin count to the other relays in the box to identify the correct unit.
In practice, this is the standard location across most 1999–2004 Grand Cherokee models. If your Grand Cherokee has an unusual engine setup or aftermarket modifications, consult the factory service manual for your exact VIN and engine code.
Testing or replacing the relay
Before testing, ensure the engine is off and cool. If the cooling fan does not operate as expected, swapping the suspected relay with a known-good relay of the same type is a quick diagnostic method. If the problem persists, check the related fuses and wiring or seek professional assistance.
- Identify a relay in the PDC with the same part designation and pin configuration as the suspected cooling fan relay.
- Power off the vehicle, remove the PDC lid, and carefully pull the suspected relay straight out.
- Insert a known-good relay in the same slot and reseat the lid securely.
- Start the engine and allow it to reach operating temperature or turn on the A/C to trigger the cooling fan; observe whether the fan engages.
- If the fan still does not run, inspect the corresponding fuse, wiring, and the fan motor itself; otherwise consider replacing the fan relay or consulting a mechanic.
Concluding: The cooling fan relay is generally accessible in the engine bay’s Power Distribution Center. Identifying the correct relay in the PDC and testing it with a known-good unit is a reliable first step in diagnosing cooling system fan issues.
Summary
For a 2004 Jeep Grand Cherokee, the cooling fan relay is located in the engine bay within the Power Distribution Center. Look for relays labeled Radiator Fan (and possibly A/C Condenser Fan) on the PDC lid. If the fan won’t run, testing the relay by swapping with a known-good unit, along with checking fuses and wiring, is a practical first diagnostic approach. If uncertainty remains, refer to the service manual for your exact engine and VIN or contact a qualified technician.
How to tell if a cooling fan relay is bad?
Bad Cooling Fan Relay Symptoms
- The engine runs hot or overheats.
- The cooling fans don't work.
- The cooling fans keep running.
- Warning lights.
- Poor air conditioning performance.
- Swapping Relays.
- Measuring the Relay Coil's Resistance.
- Listening for Noises.
Where is the radiator cooling fan relay?
Okay and that lid will come out. Now if you put the cover this way. It's going to correspond to the layout. Here the relay for the radiator fan. Now okay it will be relay R12.
What is the most luxurious Grand Cherokee?
2025 Jeep® Grand Cherokee Summit
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What are the most common problems with a 2004 Jeep Grand Cherokee?
Top 2004 Jeep Grand Cherokee Problems
- Temperature Blend/Recirculation Doors May Fail and Cause AC Problems.
- Engine Will not Start Due to Wireless Control Module Fault.
- Jeep Grand Cherokee intermittent starting issue with clicking sound after turning the key.