Description
Review this item in the context of the repair, installation access, nearby parts, and the result the completed job is intended to achieve.
Brand: Kwaich
- Package Dimensions
:
4 x 2.4 x 1.4 inches; 3.84 ounces
- Date First Available
:
October 16, 2025
- Manufacturer
:
RZ
- ASIN
:
B0FWKPKQQ9
- Best Sellers Rank: #491,787 in Automotive (See Top 100 in Automotive)
- #5 in Automotive Replacement Blower Relays
MR301978 Cooling Fan Control Relay (12V, 4-Pin)
This relay restores proper radiator/A/C condenser fan operation to help prevent overheating and weak A/C performance at idle when the original relay has failed.
Key Specifications
- OE Part: MR301978
- Configuration: 12V, 4-pin high-current automotive relay
- Typical Location: Engine-bay fuse/relay box (near battery)
- Cross-References: RY-1554, R7059, 20823, 1R2170, 25-0716, ACB82201 family
- Package: 1 × relay (socket and fuses not included)
Verified North America Fitment
- Compatible with 2003 Mitsubishi Lancer Evolution (engine-bay fuse/relay box cooling fan relay)
- Compatible with 2004 Mitsubishi Lancer Evolution (engine-bay fuse/relay box cooling fan relay)
- Compatible with 2005 Mitsubishi Lancer Evolution (engine-bay fuse/relay box cooling fan relay)
- Compatible with 2006 Mitsubishi Lancer Evolution (engine-bay fuse/relay box cooling fan relay)
- Compatible with 2007 Mitsubishi Outlander (engine-bay fuse/relay box cooling fan relay)
Installation Notes
- Disconnect the negative battery terminal before service
- Open the engine-bay fuse box, pull the old 4-pin relay straight up, press the new relay fully into the socket, refit cover
- Inspect related fuses and the relay socket for heat damage or corrosion
Cross-Part & Complements
- Some catalogs list later applications under MR400709; always confirm by VIN/part number before substitution
- For a lasting repair, pair with healthy fan motors, correct fan fuses, and a clean, undamaged relay socket
Vehicle information
Available fitment details
Listing compatibility notes
- Install Location & Service Tips — Installs in the engine-bay fuse/relay box (typically near the battery); plug-and-play replacement: disconnect battery, open cover, pull old 4-pin relay straight up, seat new relay fully, refit cover; symptoms of failure include cooling fans not engaging, overheating at idle, or weak A/C at idle; check related fuses and the relay socket for heat damage/corrosion.
- Fitment — Year by Year (Lancer Evolution) — Compatible with 2003 Mitsubishi Lancer Evolution engine-bay cooling fan relay; Compatible with 2004 Mitsubishi Lancer Evolution engine-bay cooling fan relay; Compatible with 2005 Mitsubishi Lancer Evolution engine-bay cooling fan relay; Compatible with 2006 Mitsubishi Lancer Evolution engine-bay cooling fan relay.
- Fitment — Outlander — Compatible with 2007 Mitsubishi Outlander engine-bay cooling fan relay; match by OE MR301978 for best results and verify with VIN when possible.
Fitment data is provided as a buying aid. Verify the listing against your vehicle and existing part before ordering.
Repair scenarios, installation, companion parts, and use outcomes
Buying guidance
Quick decision
Review this blower in the context of the repair and the surrounding components.
Repair scenario
- Identify the symptom and confirm that this is the component required by the repair.
- Inspect nearby connectors, fasteners, and mating surfaces before installation.
Installation notes
- Use the listing instructions when present and follow the vehicle service procedure.
- Professional installation may be appropriate when the repair requires special tools or calibration.
Companion parts
- Inspect nearby fasteners, connectors, seals, fluids, and wear items before starting the repair.
- Use the service procedure and the visible package contents to identify any additional parts or tools required.
Before you buy
- Compare the listing title, photos, package contents, and specifications with the part being replaced.
- Confirm vehicle compatibility and installation requirements before ordering.
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