Description
Check the specifications, dimensions, variation details, referenced part numbers, and available fitment evidence before matching this item to an application.
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.
Parameters, dimensions, material, fitment, and part numbers
Buying guidance
Quick decision
A blower listing with source specifications kept visible for comparison.
Fit and size 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.
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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