Identifying a Dodge Cooling Fan Relay by Model and Year
The radiator fan on most Dodge vehicles is switched electrically, but the part that does the switching varies from one model year to the next. Some vehicles have a plug-in relay you can pull and swap, some hide the relay inside a power module, and some use an electronic fan controller with no conventional relay at all. This guide explains how to tell which design your vehicle uses and how to check it without causing new problems.
Where the Dodge Cooling Fan Relay Usually Is
On most Dodge cars, minivans and SUVs, the cooling fan relay sits in the underhood power distribution center, the black box near the battery. Its position is usually printed on the underside of the lid. On many models from roughly the mid-2000s through the mid-2010s, that box is a Totally Integrated Power Module, often called the TIPM, and the fan relay may be a circuit built into the module's board rather than a removable cube. Many newer designs drive the fan through a separate fan control module that varies speed electronically. The only reliable way to know which design you have is to match your exact model, year and engine to the fuse and relay chart in the owner's manual, the lid label or the factory wiring diagram.
Trucks need extra care. Many older Dodge Ram pickups, especially with V8 gasoline or diesel engines, use an engine-driven fan with a viscous clutch as the main radiator fan. On those trucks, an electric fan relay, if fitted at all, may control only an auxiliary or condenser fan. Do not assume a relay exists until the diagram for your vehicle confirms it.
How the Fan Circuit Works
The powertrain control module decides when the fan should run. It uses inputs such as coolant temperature, air conditioning pressure or request, and vehicle speed. When cooling is needed, the module energizes the relay's control coil, usually by completing its ground side. The relay then closes its high-current contacts and sends battery power through a dedicated fuse to the fan motor. This arrangement lets a small computer output switch a large load. Fan motors draw substantial current, so the fan circuit usually carries one of the higher fuse ratings in the box, and weak connections in it heat up quickly.
Two-speed systems often use separate low-speed and high-speed relays. On some designs, low speed runs two fan motors in series or routes current through a resistor, and high speed switches them to full voltage. That is why a fan that works on only one speed usually points to one relay or one branch of the circuit, not necessarily to a failed motor. Systems with an electronic fan control module work differently. The engine computer sends a command signal, the module varies motor speed, and there is no relay to click or swap.
What Changes the Answer
Model year matters most, but it is not the only factor. Engine choice, air conditioning, towing or heavy-duty cooling packages, and redesigns within the same nameplate can all move the relay or replace it with a module. A change can also happen mid-year, so two vehicles of the same model and year may differ. When the owner's manual chart and the lid label disagree with what you see, trust the physical label and a VIN-based wiring diagram over general references.
Electrified Dodge models need a clear distinction between the two electrical systems. The Hornet R/T plug-in hybrid and the battery-electric Charger Daytona carry a high-voltage traction battery with orange cabling, along with a conventional 12-volt battery. That 12-volt battery plays the role of the starter battery and powers fuses, relays and control circuits, including low-voltage fan controls. Cooling and thermal management on these vehicles may also involve components tied to the high-voltage system. Never probe, unplug or cut orange cables or anything connected to them, and leave the high-voltage disable procedure to trained technicians.
Fan behavior after shutdown also varies. Some vehicles legitimately run the fan for a short time after the key is off. A fan that runs until the battery is dead is different. That usually means a relay stuck closed or a module fault creating a parasitic draw, and it can leave you with a no-start the next morning.
What You Can Check Yourself
Start by identifying the part. Open the power distribution center, read the lid label and find the position marked for the radiator fan or cooling fan. If you find a removable relay, note the part number printed on it and compare it with other relays in the box. Many share the same type. If the chart shows a fan circuit but no removable relay, the switching is probably internal to the module or handled by a fan control module.
For a removable relay, a simple swap test is often the quickest step. With the key off, exchange the fan relay with an identical-numbered relay from a non-critical circuit, such as the horn, and see whether the fault moves. On many vehicles, turning on the air conditioning with the engine running requests the fan, which gives a quick functional check. Then check the fan fuse on both sides with a test light. Measure system voltage at the battery terminals: about 12.6 volts with the engine off is typical of a charged battery, and roughly 13.5 to 14.7 volts with the engine running indicates normal charging output. When the fan is commanded on, compare the voltage at the fan connector with battery voltage. A voltage drop of more than a few tenths of a volt points to a corroded terminal, a weak relay contact or damaged wiring.
Isolation and safety come first. Keep hands, clothing and tools away from the fan blades, because the fan can start without warning while the key is on and, on some vehicles, after shutdown. Disconnect the negative battery cable before unplugging the fan connector or working on wiring, and expect radio presets and some learned settings to reset. Do not pry at relay positions on a TIPM, because some are not designed to be removed.
Limitations and When to Get Help
General guidance cannot replace the wiring diagram for your exact VIN, and relay positions shown for one trim or engine may not apply to yours. If the fault traces to an internal TIPM circuit, repair usually means replacing or rebuilding the module, and some replacements must be programmed to the vehicle. Systems with a fan control module are easier to diagnose with a scan tool that shows the commanded fan state and coolant temperature, because there is no relay to test directly.
If the temperature gauge climbs toward hot, stop driving and let the engine cool rather than continuing while you troubleshoot. Any work near high-voltage components on a hybrid or electric Dodge belongs with a qualified technician. For everything else, the practical next step is to get the diagram for your VIN, confirm which fan control design you have, and then test fuse, relay, voltage and ground in that order.