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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

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

$15.99

Confirm quantity, package contents, selected variation, current offer details, and store terms before placing the order.

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.

Before you order
  • Confirm the part number, position, dimensions, and connector details shown on this page.
  • Compare the listing with the part currently installed on your vehicle.
SKU: D-B0FWKPKQQ9 Category:

Description

Brand: Kwaich
  • Package Dimensions
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    :
    ‎
     4 x 2.4 x 1.4 inches; 3.84 ounces
  • Date First Available
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    :
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     October 16, 2025
  • Manufacturer
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    :
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     RZ
  • ASIN
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    :
    ‎
     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

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Product facts

Specifications

Canonical product
MP-US-B0FWKPKQQ9
Source product ID
B0FWKPKQQ9
Category
Replacement Parts / Switches & Relays / Relays / Blower
Available images
6

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.

Exact identity, part numbers, model references, and available compatibility evidence

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An identity-first blower listing organized around stable product references and available compatibility evidence.

Fit and size notes

  • Match the complete identifier, side, position, connector, dimensions, and visible design with the existing part.
  • Treat uncertain vehicle notes as a buying aid, not as a confirmed fitment guarantee.

Specification notes

  • Canonical product: MP-US-B0FWKPKQQ9
  • Source product ID: B0FWKPKQQ9
  • Category: Replacement Parts / Switches & Relays / Relays / Blower
  • Available images: 6

Before you buy

  • Match the complete identifier, side, position, connector, dimensions, and visible design with the existing part.
  • Treat uncertain vehicle notes as a buying aid, not as a confirmed fitment guarantee.