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Build-Your-Own MK4 1.8T Performance Cooling System Refresh Kit

Upgrade your 1.8T's cooling system with select performance upgrades from ECS Tuning!

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ES#:: 4005762
Mfg#:: 018163ECS03

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Build-Your-Own MK4 1.8T Performance Cooling System Refresh Kit

Starting at: $267.74

SALE: 836.62

Starting at: $267.74

WAS: $926.99 on 06-13-2026

This product was last offered at the strikethrough price on
06-13-2026

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MK4 Performance Aluminum Radiator

Direct-fit upgrade! Featuring a 26% increase in cooling system capacity along with a durable, all aluminum construction

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4001222 018163ECS01KT

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Partial Replacement

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267.74

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Cast Aluminum Cooling System Upgrade Kit

Replace the failure prone components in your cooling system with cast aluminum

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3086229 006368ECS01A1KT

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176.98

Cast Aluminum Coolant Flange

Located on the driver side of the cylinder head, this pipe contains the coolant tempature sensor

3470644 462-121-132AP

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49.99

Cast Aluminum 4-way Outlet Coolant Distribution Pipe

Replacement 4-way outlet at upper radiator hose in aluminum

3470646 462-121-087C

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24.99

Heavy Duty Cast Aluminum Thermostat Housing

The last thermostat housing you'll ever need!

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3086042 006660ECS01

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64.49

Aluminum Split Pipe Coolant Fitting

Replaces the failure prone, plastic coolant split pipe from the turbo & expansion tank to the water pipe hose

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2748757 006368ECS01A

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$67.99

This product was last offered at the strikethrough price on
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2.54

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Racing Thermostat (82C)

Prevent overheating and premature engine wear with a lower opening temperature

3184176 MMTS-GTI-99

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68.99

Thermostat (87°C)

Prevent overheating and premature engine wear

261231 050121113C

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52.99

Thermostat (87°C)

Prevent overheating and premature engine wear. Includes O-ring

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3149390 050121113C

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20.99

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Coolant Temperature Sensor With O-Ring & Clip - 4 Pin - *ECS Recommends*

Updated Green sensor with square/round connector. Please check existing sensor color

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2535452 059919501AKTU

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20.66

Coolant Temperature Sensor With O-Ring & Clip - 4 Pin

Updated Green sensor with square/round connector. Please check existing sensor color

264174 059919501AKT2

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47.91

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Auxiliary Fan Switch � 95-102�C

Square connector with rounded ends, includes O-Ring

2146770 1H0698481B

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9.99

Radiator Fan Switch 95-102°C

Triangular Connector

310850 1J0959481A

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Lifetime Replacement

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124.99

Radiator Fan Switch 95-102C

Triangular Connector

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2537915 1J0959481A

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Ships on Dec 15, 2026

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19.99

Auxiliary Fan Switch � 87-93�C

Square connector with rounded ends

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251122 701959481

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Ships on Dec 15, 2026

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16.99

Auxiliary Fan Switch � 75-82�C

Square connector with rounded ends

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1928244 1H0959481D

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15.99

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Expansion Tank Replacement Kit - Complete Assembly With Porsche Cap

Add some style with this reservoir kit which includes an aluminum Porsche coolant cap!

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2597343 42012132118T

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80.01

Expansion Tank Replacement Kit - Complete Assembly

Clean up your engine bay or replace your cracked unit with a new coolant expansion tank replacement kit.

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2575924 1J01000-1

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Partial Replacement

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24.70

Coolant Expansion Tank

Clean up your engine bay or replaced your cracked unit with a new coolant expansion tank

1905029 1J0121407F

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56.17

Coolant Expansion Tank

Clean up your engine bay or replaced your cracked unit with a new coolant expansion tank

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2709358 1J0121407F

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15.99

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7 Piece Silicone Coolant Hose Kit - Black

Replace your stock rubber hoses with silicone

1843968 FMKC005

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Lifetime Replacement

377.99

7 Piece Silicone Coolant Hose Kit - Blue

Replace your stock rubber hoses with silicone

1843970 FMKC005B

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Lifetime Replacement

230.00

7 Piece Silicone Coolant Hose Kit - Red

Replace your stock rubber hoses with silicone

1843969 FMKC005R

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230.00

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G13 Coolant - 1.5 Liter

Lilac OE VW/Audi specification concentrate lifetime coolant

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2603076 G013A8JM1

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Est. Ship Date:

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No Lifetime Replacement

21.99

Liquid Chill Premixed Synthetic Engine Coolant - 64oz

Perfect for a top off any time you need it!

3676995 MMRALC505064F

Availability:

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Lifetime Replacement

28.99

Genuine Volkswagen Audi G12evo Coolant / Antifreeze - 1 Gallon (3.78 Liters)

Extended Life Coolant Pre-mixed 50/50

4672297 G12E0501GRTU

Availability:

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No Lifetime Replacement

30.95

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Product Details

10X Entries For Our 25th Anniversary Sweepstakes!

This comprehensive kit was designed to address the major issues with the cooling system while giving you some added performance benefits. The ECS Tuning in-house engineered Performance Aluminum Radiator utilizes a larger volume, dual row, dual-pass aluminum heat exchanger, hand TIG-welded to 5052 aluminum end tanks and polished to perfection. Featuring a 26% increase in overall volume compared to stock, this is a direct replacement radiator that will outperform and outlast the OE unit!

Instead of chasing one issue at a time, ECS designed this kit to make it simple. Replace all your potentially faulty components in one afternoon for peace of mind.

To ensure completely hassle-free operation, make sure the water pump has been or will be serviced during the timing belt service. ECS has a wide selection of timing belt kits to ensure your car is always running at peak performance.

This Part Fits the Following Vehicles

Make	Model	Submodel	Engine	Special Fitment Notes
Volkswagen	337/20AE	All	1.8T	Use vehicle selector to confirm fitment
Volkswagen	Golf IV	All	1.8T	Use vehicle selector to confirm fitment
Volkswagen	Jetta IV	All	1.8T	Use vehicle selector to confirm fitment
Volkswagen	Jetta IV GLI	All	1.8T	Use vehicle selector to confirm fitment

*The above product applications have been written by ECS Tuning. All warranties, product application, fitment, and performance are the responsibility of ECS Tuning. For additional information see the terms of use.