Description
Comparison points and tradeoffs
When comparing MR301978 MR400709 12V 4-Pin Cooling Fan Relay, Compatible with Mitsubishi Lancer Evolution 2003–2006 & Outlander 2007, Engine-Bay Fuse Box Replacement, Cross-Ref RY-1554 R7059 20823 ACB82201 with other Blower options, use this source-backed detail as the primary discriminator: 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.
Use this second fact to evaluate the tradeoff: Compatible with 2003 Mitsubishi Lancer Evolution (engine-bay fuse/relay box cooling fan relay). A third point to compare across alternatives is: 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.
Alternative-selection boundary
Choose an alternative when its stated identifiers, application, package, or specifications better match the requirement; no unverified competitor claim is introduced here.
Complete source-backed product details
- 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
Source product highlights
About this item
- Specs & OE/Cross-Refs — 12V 4-pin high-current automotive relay for radiator/A/C condenser fan circuits; OE: MR301978; cross-ref numbers include RY-1554, R7059, 20823, 1R2170, 25-0716, ACB82201 family; includes 1× relay (no socket).
- 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.
- Cross-Part Notes & Complements — Some catalogs show later applications under MR400709; always confirm by VIN/part tag before substitution; for a complete repair and to prevent repeat failures, consider complementary items often serviced together such as radiator or A/C condenser fan motors, appropriate fan fuses, and a clean, undamaged relay socket.
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