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Starting at $59.95, AutoBuffy stocks 5 engine cooling fan relay kits from Four Seasons, Dorman, and Mopar. The cooling fan relay is an electrical switch that tells your radiator or condenser fan to run when the engine reaches operating temperature. When it fails, the fan stops receiving the signal to turn on, leading to overheating and potential engine damage.
Cooling fan relay kits vary by whether they include just the relay, or a complete kit with the relay, pigtail wiring connector, and mounting hardware. Matching the relay's amperage rating and connector style to the original is the most important factor — an undersized relay will overheat and fail quickly, while a mismatched connector means the kit won't plug in without modification.
| Option | Best for | What you get |
|---|---|---|
| OEM-Equivalent Relay Only | Straightforward swap when the existing wiring harness and connector are in good condition | Single relay matched to factory amperage rating and connector footprint; most affordable entry point |
| Complete Kit with Pigtail Connector | Vehicles where heat or corrosion has damaged the connector housing or wiring near the relay | Relay plus pre-wired pigtail so you splice into known-good wire rather than risk a bad connection at the old terminal |
| Heavy-Duty / Upgraded Relay | Vehicles used for towing, in hot climates, or with a history of repeated relay failures | Higher-rated relay contacts that handle thermal cycling better; reduces likelihood of the same failure recurring |
| Multi-Relay Kit (Fan + A/C Relays) | Situations where both the cooling fan relay and the A/C condenser fan relay are suspect or have the same part number | Two or more matched relays servicing the entire cooling and A/C fan circuit in one purchase, preventing a repeat repair visit |
Start by locating the correct relay in the fuse and relay box — the owner's manual or lid diagram will identify it by position. Pull the old relay straight out, confirm the replacement matches the terminal layout and amperage rating, and press the new relay firmly into the socket until it seats. If installing a pigtail kit, disconnect the battery before cutting into the wiring harness, match wire colors or use a wiring diagram, and use soldered or crimp connections rated for automotive use rather than simple twist-and-tape joints.