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 | Options and Comparison Guide

Name: 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 | Options and Comparison Guide
SKU: E-B0FWKPKQQ9
Price: 15.99 USD
Availability: InStock

$15.99

SKU: E-B0FWKPKQQ9 Category: Blower

Comparison view: Compare 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 using this source-backed 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 point to evaluate the tradeoff: Compatible with 2003 Mitsubishi Lancer Evolution (engine-bay fuse/relay box cooling fan relay). Use a comparison lens: material, dimensions, compatibility, package scope, and upgrade tradeoffs.

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Confirm the part number, position, dimensions, and connector details shown on this page.
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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.

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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

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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RZ
ASIN
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:
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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

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.

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.

Selection, alternatives, tradeoffs, upgrades, and direct replacements

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