Genuine OEM MR301978 MR400709 12V 4-Pin Cooling Fan Relay, Compatible with Mitsubishi Lancer Evolution 2003–2006 & Outlander 2007, Engine-Bay Fuse Box Replacement, Ref RY-1554 R7059 20823 ACB82201

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 SpecificationsOE Part: MR301978Configuration: 12V, 4-pin high-current automotive relayTypical Location: Engine-bay fuse/relay box (near battery)Cross-References: RY-1554, R7059, 20823, 1R2170, 25-0716, ACB82201 familyPackage: 1 × relay (socket and fuses not included)Verified North America FitmentCompatible 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 NotesDisconnect the negative battery terminal before serviceOpen the engine-bay fuse box, pull the old 4-pin relay straight up, press the new relay fully into the socket, refit coverInspect related fuses and the relay socket for heat damage or corrosionCross-Part & ComplementsSome catalogs list later applications under MR400709; always confirm by VIN/part number before substitutionFor a lasting repair, pair with healthy fan motors, correct fan fuses, and a clean, undamaged relay socket

• 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.