Best Automotive Replacement Engine Cooler Accessories in 2026

Daisy
Last Updated: Jul 18, 2026

At a Glance: Our Top Picks for Automotive Replacement Engine Cooler Accessories

Hayden 679 Universal 11” Rapid-Cool Add-On Transmission Cooler to Enhance Cooling (not for direct replacement of the factory unit)
#TOP1
Hayden 679 Universal 11” Rapid-Cool Add-On Transmission Cooler
9.9
PM SCORE
Hayden Automotive 678 Universal Rapid-Cool 9.5” x 11” Add-On Transmission Cooler – Not for Direct Replacement of the OE Cooler
#TOP2
Hayden Automotive 678 Universal Rapid-Cool 9.5” X 11”
9.8
PM SCORE
PartsSquare 175-185 Degree Electric Cooling Fan Thermostat Kit Temp Sensor Temperature Switch 40 50 60 amp RELAY KIT
#TOP3
Partssquare 175-185 Degree Electric Cooling Fan Thermostat Kit
9.7
PM SCORE

* PickSmartly editors independently research, review, and endorse the top products through comprehensive data analysis. We may earn a commission for qualifying purchases made through our product links.

Summary of the Best Automotive Replacement Engine Cooler Accessories of 2026

Market Overview
Automotive Replacement Engine Cooler Accessories Reviewed
  • Reviews Analyzed: 8910 Items
  • PM Avg. Rating: 6.6 / 10
19 Products Evaluated
  • Highest Price: $336.34
  • Lowest Price: $11.94
  • Avg. Price: $55.44

Hayden 679 Universal 11” Rapid-Cool Add-On Transmission Cooler To Enhance Cooling (Not For Direct Replacement Of The Factory Unit)

HAYDEN AUTOMOTIVE
679
0.70 X 11.00 X 11.60 Inches
2.75 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Size is 3/4 inch x 11 inch x 11-5/8 inch. Compatible with OEM cooler systems

Class "A" motor homes, large travel trailers, 5th wheel trailers

GVWR up to 30,000 pounds, towing up to 10,000 pounds

Patented internal turbulation increases heat transfer with minimal pressure drop

Pre-drilled mounting brackets for easy installation

Hayden Automotive 678 Universal Rapid-Cool 9.5” X 11” Add-On Transmission Cooler – Not For Direct Replacement Of The Oe Cooler

HAYDEN AUTOMOTIVE
678
2.10 X 13.70 X 11.30 Inches
1.07 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Size Is 3/4 Inch X 11 Inch X 9-1/2 Inch

Pick-Up Trucks And Vans, Class "C" Motor Homes , Travel Trailers To 24 Feet

Gvwr Up To 24,000 Pounds, Towing Up To 5,000 Pounds

Patented Internal Turbulation Increases Heat Transfer With Minimal Pressure Drop

Partssquare 175-185 Degree Electric Cooling Fan Thermostat Kit Temp Sensor Temperature Switch 40 50 60 Amp Relay Kit

PARTSSQUARE
GRQV-0774524668
4.72 X 3.15 X 1.97 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
PartsSquare 9.88

Features

Replacement for : 265 283 305 307 327 350 383 400 396 402 427 454 472 502 260 289 302 351W 347 352 360 390 406 427 428 429 460 351C 351M 400M 273 318 340 360 361 383 400 413 426W 440 455 330 326 ENGINES

New 175 - 185 degree electric fan thermostat relay switch kit for your cooling system, It is a NPT3/8" thread.

This kit includes everything you'll need to hook up to your fan, includes a brass adapter to install the sending unit, wires, relay switch, circut breaker, terminals and mounting screws.

This kit is set up to turn your electric fan on at 185 degrees and shut off at 175 degrees and will work with any 12 volt system.

High Quality Replacement Part, have no-worry 12 months warranty.

Hayden Automotive 516 High Performance Transmission Cooler

HAYDEN AUTOMOTIVE
516
15.80 X 0.70 X 10.00 Inches
2.85 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Size is 3/4 inch x 10 inch x 15-7/8 inch

SAE 45 degree fittings for maximum reliability

Electrostatically powder coated to prevent corrosion

All aluminum lightweight construction

Fits up to class "A" motorhomes towing up to 10,000 pounds

Hayden Automotive 402 Ultra-Cool Tube And Fin Transmission Cooler

HAYDEN AUTOMOTIVE
402
2.20 X 3.00 X 2.10 Inches
1.60 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Size is 3/4 inch x 5 inch x 15-7/8 inch

Compact and mid-size cars

GVWR up to 16,000 pounds, towing up to 2,500 pounds

Ultrasonically soldered for durability

100 percentage pressure tested

Hayden Automotive 405 Ultra-Cool Tube And Fin Transmission Cooler

HAYDEN AUTOMOTIVE
405
2.10 X 16.70 X 11.10 Inches
2.40 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Size is 3/4 inch x 10 inch x 15-7/8 inch

Class "A" motor homes, large travel trailers, 5th wheel trailers

GVWR up to 26,000 pounds, towing up to 10,000 pounds

Ultrasonically soldered for durability

100 percentage pressure tested

Hayden Automotive 512 High Performance Transmission Cooler

HAYDEN AUTOMOTIVE
512
2.20 X 16.90 X 11.10 Inches
2.45 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Size is 3/4 inch x 7-1/2 inch x 12-1/2 inch

SAE 45 degree fittings for maximum reliability

Electrostatically powder coated to prevent corrosion

All aluminum lightweight construction

Fits full-size vehicles towing up to 2,500 pounds

Faersi 175-185 Degree Electric Cooling Fan Thermostat Kit Temperature Sensor Temperature Switch 40 50 60 Amp Relay Kit

FAERSI
F-10041
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
FAERSI Autoparts 9.90

Features

【COMPATIBLE VEHICLES】 265 283 305 307 327 350 383 400 396 402 427 454 472 502 260 289 302 351W 347 352 360 390 406 427 428 429 460 351C 351M 400M 273 318 340 360 361 383 400 413 426W 440 455 330 326 ENGINES

【DIRECT FIT & EASY INSTALLATION】This kit includes everything you'll need to hook up to your fan, includes a brass adapter to install the sending unit, wires, relay switch, circut breaker, terminals and mounting screws.Comes complete with instructions with easy to read wiring diagrams.

【Premium Quality】New 175-185 degree electric fan thermostat relay switch kit for your cooling system, sending Unit Thread Size: 3/8-18 NPT, Voltage: 12 V.

【WORKING】This kit is set up to turn your electric fan on at 185 degrees and shut off at 175 degrees and will work with any 12 volt system.

【NOTE】1 Year No-worry Warranty - Every product must take inspected and tested multiple times before the shipment, if you get any problems with our this Electric Cooling Fan Thermostat Kit, please contact us in the first time.High Quality OEM Replacement Part Please rest assured to buy.

Faersi 185-200 Degree Electric Cooling Fan Thermostat Kit Temperature Sensor Temperature Switch 50 60 Amp Relay Kit

FAERSI
F-10042
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
FAERSI Autoparts 9.90

Features

【COMPATIBLE VEHICLES】 265 283 305 307 327 350 383 400 396 402 427 454 472 502 260 289 302 351W 347 352 360 390 406 427 428 429 460 351C 351M 400M 273 318 340 360 361 383 400 413 426W 440 455 330 326 ENGINES

【DIRECT FIT & EASY INSTALLATION】This kit includes everything you'll need to hook up to your fan, includes a brass adapter to install the sending unit, wires, relay switch, circut breaker, terminals and mounting screws.

【Premium Quality】New 185-200 degree electric fan thermostat relay switch kit for your cooling system, sending Unit Thread Size: 3/8-18 NPT, Voltage: 12 V.

【WORKING】This kit is set up to turn your electric fan on at 200 degrees and shut off at 185 degrees and will work with any 12 volt system.

【NOTE】Every product must take inspected and tested multiple times before the shipment, if you get any problems with our this Electric Cooling Fan Thermostat Kit, please contact us in the first time.we can provide free replacement or refund.

Hayden Automotive 676 Custom-Add-On Rapid-Cool Transmission Cooler 11.0” X 5.875” X 0.70”, Not For Direct Replacement

HAYDEN AUTOMOTIVE
676
11.00 X 5.88 X 0.70 Inches
2.15 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Size: 11.0”L x 5.875” W x 0.70”H

Sub-compact to compact cars; GVWR up to 18,000 pounds

Made of steel

Patented internal turbulation increases heat transfer with minimal pressure drop

Pre-drilled mounting brackets for easy installation

Hayden Automotive 514 High Performance Transmission Cooler

HAYDEN AUTOMOTIVE
514
16.90 X 11.00 X 2.00 Inches
2.80 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Size is 3/4 inch x 7-1/2 inch x 15-7/8 inch

SAE 45 degree fittings for maximum reliability

Electrostatically powder coated to prevent corrosion

All aluminum lightweight construction

Fits up to class "C" motorhomes towing up to 5,000 pounds

Mota Performance A11008 24" Heat Sink Finned Dual Pass Aluminum Transmission Cooler

MOTA PERFORMANCE
A11008
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING

Features

Dual Pass design perfect for tight or limited space applications

Clear anodized aluminum finish

3 Inch diameter cooler features two 1/4 inch NPT inlets

Heavy Duty Dual Pass Design

Quality Corrosion Resistant Clear Anodized finish

3 Inch diameter cooler features two 1/4 inch NPT inlets

Perfect for tight areas or along the frame rail.

Sold individually

#TOP13

Garage-Pro Engine Coolant Pipe O-Ring Kit Compatible With 2004-2010 Bmw X5 & 2006-2008 Bmw 750I Front

GARAGE-PRO
JCWRB32430001GP
7.52 X 3.52 X 2.00 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
AutoPartsGiant 9.75

Features

Aftermarket Replacement Engine Coolant Pipe O-Ring Compatible with 2004-2010 BMW X5, 2006-2008 BMW 750i, 2006-2008 BMW 750Li & 2006-2010 BMW 650i

Features: Kit, Collapsible Water Transfer Pipe Coolant Tube O-rings and Seal Kit

Location: Front

Interchange Part Numbers: 111414399752

A high quality, Direct Fit OE Replacement Engine Coolant Pipe O-Ring, with FREE 1-year UNLIMITED mileage warranty coverage on Garage-Pro items.

#TOP14

Improved Racing Egm-106 Low-Profile Oil Cooler Adapter For Gm Ls Engines, 8An

IMPROVED RACING
EGM-106-08AN
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Improved Racing 5.54

Features

100% bolt-on unit replaces the factory oil bypass cover, just above the oil filter, and makes for easy installation of an oil cooler on any rear sump GM LS family engine. No oil filter relocation is required

Slim design provides maximum clearance for aftermarket headers

Features two 1/8” NPT ports for oil sensors or a turbo oil supply line

6061-T6 billet aluminum construction and black anodized finish. Female -8AN O-ring boss threads. Includes two black anodized aluminum fittings with Viton O-rings for -8AN lines

Made in USA. Lifetime manufacturer's warranty

Demotor Performance Cooling Fan Thermostat Kit Temp Sensor Temperature Switch,Relay Kit 200 Degree

DEMOTOR PERFORMANCE
PE032
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
OnePrime Direct 9.70

Features

Fit for all of our store fans.

It comes on at 200° and turns off at 180°.

Package: including all items in the picture.

This kit is set up to turn your electric fan on at 200 degrees and shut off at 180 degrees and will work with any 12-volt system.

This kit includes everything you'll need to hook up to your fan.

#TOP16

Hayden Automotive 677 Rapid-Cool Plate And Fin Transmission Cooler

HAYDEN AUTOMOTIVE
677
13.70 X 11.40 X 1.90 Inches
2.20 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Size is 3/4 inch x 11 inch x 7-1/2 inch

Mid-size and full-size cars, pick-ups. Material-Aluminum

GVWR up to 20,000 pounds, towing up to 2,500 pounds. Coolant temperatures operate from 210°F to 220°F

Patented internal turbulation increases heat transfer with minimal pressure drop

Pre-drilled mounting brackets for easy installation

#TOP17

Coolant Temperature Sensor, Brass Standard Voe20513340 Excavator Temp Sensor High Hardness For Replacement

JEANOKO
JEANOKOC2837FSI143275
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Xiecaiboe-US 3.63

Features

APPLICABLE MODEL: This engine coolant temperature sensor is suitable for EC210B EC240B EC290B EC140B excavator, professional and practical.

STANDARD SIZE: The sensor interface is standard, can be connected firmly, and is not easy to fall off after installation.

REPLACEMENT PART: This coolant temperature sensor is a common accessory for excavators, can replace old or broken part directly.

BRASS MATERIAL: Made of excellent brass, can withstand harsh weather and environment, strong and sturdy, ensures long term use.

EXCELLENT PERFORMANCE: Produced by professional craftsmanship and tested under strict quality standards, feature excellent performance and good stability.

#TOP18

Dorman 904-132 Exhaust Gas Recirculation Cooler Kit Compatible With Select Chevrolet / Gmc Models (Oe Fix)

DORMAN
904-132
14.00 X 6.30 X 5.90 Inches
8.50 Pounds
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING
Amazon.com 9.68

Features

Improved reliability - this replacement EGR cooler features a spiral tube design, reducing clogging experienced with the original manufacturer's design

Superior durability - precision-engineered using welded stainless steel for long service life

Rigorously tested - heat transfer testing, burst testing and vehicle try-on testing ensures fit and reliability

Hardware included - all necessary O-rings, gaskets, and application-specific hardware included

Ensure fit - to make sure this part fits your exact vehicle, input your make, model and trim level into the garage tool

Oemtools 27069 Cooling System Pressure Test Pump, Near Universal Cooling System Pressure Tester, Diagnose And Locate Leaks, Compatible With Most Adapters

OEMTOOLS
27069
14.00 X 9.00 X 3.50 Inches
SELLER SELLER SCORE AMAZON FULFILLED PRIME FREE SHIPPING

Features

COOLANT PRESSURE TESTER KIT: Our cooling system pressure tester kit is designed to diagnose and help locate leaks in automotive cooling systems; Pressure tester for coolant system manually pressurizes and monitors cooling systems

WORKS WITH MOST VEHICLES: This coolant pressure test pump quickly and easily tests cooling systems in most domestic and import vehicles; Ideal automotive coolant pressure tester range from 4 to 30 PSI

COMPATIBLE WITH MOST ADAPTERS: The radiator pressure tester kit pump is designed to work with cooling system adapters and almost any coolant pressure tester adapter kit (adapters not included and can be purchased separately from OEMTOOLS)

DURABLE AND EASY TO USE: Our heavy duty radiator pressure tester is made from steel for strength and durability, ensuring this coolant pressure tester gauge lasts for years to come; Radiator test kit includes an easy lever style pressure relief valve

CONVENIENT STORAGE: This pressure tester radiator kit comes in a sturdy blow mold case that has plenty of room for purchased adapters; Easily take this radiator pressure kit wherever you need it to get the job done

Top 10 automotive replacement engine cooler accessories Brands on Amazon

Here is the list of top-rated brands that were evaluated by PM.

Brand Count
Hayden Automotive 9
Faersi 2
Demotor Performance 1
Dorman 1
Garage-Pro 1
Improved Racing 1
Jeanoko 1
Mota Performance 1
Oemtools 1
Partssquare 1

Top 10 automotive replacement engine cooler accessories Brands Pie Chart


We've carried out a comprehensive analysis of 8,910 reviews on automotive replacement engine cooler accessories, using our selection criteria to identify the best options in the automotive replacement parts. Our findings reveal that most customers typically select automotive replacement engine cooler accessories priced around $55.44, with top brands including dorman, hayden automotive, mostplus and 3mirrors and bdfhyk

Our team of expert editors reviewed these high-quality items and handpicked the top 19 automotive replacement engine cooler accessories for your consideration. We've also done extensive research on numerous sellers, identifying the best ones in the automotive replacement parts category. These include amazon.com, mostplus and repairyourcar and amazon warehouse .

We are dedicated to assisting our users in finding the right accessories Products based on their needs, saving them considerable time when choosing which automotive replacement engine cooler accessories to buy. We take pride in the number of satisfied users we've helped through our thorough and insightful reviews.