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Volkswagen MK4 Engine Cooling Parts

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Coolant Flange

ES#5341346 - 06A121132AP - Coolant Flange - Located on the driver side of the cylinder head, this pipe contains the coolant tempature sensor - Rein - Audi Volkswagen

Located on the driver side of the cylinder head, this pipe contains the coolant tempature sensor 2X Entries For Our 25th Anniversary Sweepstakes!
For vehicles with manual transmission only

Brand:
Rein - Corporate Logo
ES#:
5341346
Mfg#:
06A121132AP
Ships in 3 Business Days
$9.99 USD
Free Shipping
on orders $49 and up

Gasket

ES#331429 - 321819017 - Gasket - Keeps heater core from rubbing on housing - Genuine Volkswagen Audi - Volkswagen

Keeps heater core from rubbing on housing

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
331429
Mfg#:
321819017
Ships in 1 day
28% off MSRP

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$13.78

This product was last offered at the strikethrough price on
07-30-2026

$9.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat (87°C)

ES#1891980 - 050121113C - Thermostat (87C) - Prevent overheating and premature engine wear - 050121113C - MTC - Audi Volkswagen

Prevent overheating and premature engine wear - 050121113C

Brand:
MTC - Corporate Logo
ES#:
1891980
Mfg#:
050121113C
Ships in 9 Business Days
$9.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Auxiliary Fan Switch � 95-102�C

ES#2146770 - 1H0698481B - Auxiliary Fan Switch 95-102C - Square connector with rounded ends, includes O-Ring - MTC - Volkswagen

Square connector with rounded ends, includes O-Ring For vehicles with square connector only

Brand:
MTC - Corporate Logo
ES#:
2146770
Mfg#:
1H0698481B
Back Ordered
$9.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank

ES#2814304 - 1J0121321B - Expansion Tank - Keep proper pressure in your coolant system - Hamburg Tech - Audi Volkswagen

Keep proper pressure in your coolant system We Price Match - Give Us A Call or Chat!

Brand:
Hamburg Tech - Corporate Logo
ES#:
2814304
Mfg#:
1J0121321B
Ships in 1 Business Day
$4.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

O-RING (36 X 3.15MM)

ES#2800836 - 37121687 - O-RING (36 X 3.15MM) - Meistersatz - Audi Volkswagen

Brand:
Meistersatz - Corporate Logo
ES#:
2800836
Mfg#:
37121687
In Stock at Vendor
$4.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Flange

ES#2535196 - 038121132C - Coolant Flange - Located on the left side of the cylinder head - URO - Volkswagen

Located on the left side of the cylinder head 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!
For vehicles with ALH engine code and automatic transmission only

Brand:
URO - Corporate Logo
ES#:
2535196
Mfg#:
038121132C
Ships in 1 Business Day
$7.99

This product was last offered at the strikethrough price on
04-10-2026

$4.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Anti-Freeze Tester

ES#4337913 - CTAA195 - Anti-Freeze Tester - Tests all ethylene glycol solutions with radiator hot or cold - CTA Tools - Audi BMW Volkswagen Mercedes Benz MINI Porsche

Tests all ethylene glycol solutions with radiator hot or cold

Brand:
CTA Tools - Corporate Logo
ES#:
4337913
Mfg#:
CTAA195
Ships on Aug 17, 2026
$9.98 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Hose Coupler

ES#2561850 - 1J0122291B - Coolant Hose Coupler - Replace brittle plastic parts. - Meyle - Volkswagen

Replace brittle plastic parts. 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Meyle - Corporate Logo
ES#:
2561850
Mfg#:
1J0122291B
In Stock at Vendor
$9.17 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Distribution Pipe

ES#1897525 - 1J0121087C - Coolant Distribution Pipe - Plastic 3-way oulet at upper radiator hose - Meyle - Audi Volkswagen

Plastic 3-way oulet at upper radiator hose 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Meyle - Corporate Logo
ES#:
1897525
Mfg#:
1J0121087C
Ships on Dec 9, 2026
$9.11 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Water Distribution Pipe

ES#251395 - 1J0121087 - Water Distribution Pipe - Palstic 3-way oulet at lower radiator hose - Original Equipment Supplier - Volkswagen

Palstic 3-way oulet at lower radiator hose Manual Transmission up to model year 2004 only

Brand:
Original Equipment Supplier - Corporate Logo
ES#:
251395
Mfg#:
1J0121087
Ships in 1 day
$8.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Multipurpose Relay - Priced Each

ES#1831766 - 141951253B - Multipurpose Relay - Priced Each - Replacement 4-pin/40 amp relay - Meyle - Audi Volkswagen

Replacement 4-pin/40 amp relay 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Meyle - Corporate Logo
ES#:
1831766
Mfg#:
141951253B
In Stock
$8.98 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat Housing

ES#259316 - 06A121121C - Thermostat Housing - Common point of failure for the cooling system. O-ring included. - Meyle - Audi Volkswagen

Common point of failure for the cooling system. O-ring included. 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Meyle - Corporate Logo
ES#:
259316
Mfg#:
06A121121C
Back Ordered
$8.15 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Drain Adapter

ES#2816130 - 6Q0122291F - Coolant Drain Adapter - Lower radiator drain coupling adapter - Hamburg Tech - Audi Volkswagen

Lower radiator drain coupling adapter We Price Match - Give Us A Call or Chat!

Brand:
Hamburg Tech - Corporate Logo
ES#:
2816130
Mfg#:
6Q0122291F
Ships in 1 Business Day
$7.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Cap

ES#2815697 - 3B0121321 - Expansion Tank Cap - Keep proper pressure in your coolant system - Hamburg Tech - Audi Volkswagen

Keep proper pressure in your coolant system We Price Match - Give Us A Call or Chat!

Brand:
Hamburg Tech - Corporate Logo
ES#:
2815697
Mfg#:
3B0121321
Ships in 1 Business Day
$7.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Flange

ES#2878291 - 044121144B - Coolant Flange - Attaches to flange on the cylinder head - Vaico - Volkswagen

Attaches to flange on the cylinder head We Price Match - Give Us A Call or Chat!
For vehicles with BEW engine code and automatic transmission only

Brand:
Vaico - Corporate Logo
ES#:
2878291
Mfg#:
044121144B
In Stock at Vendor
$9.99

This product was last offered at the strikethrough price on
04-19-2026

$7.99 USD
This product is lifetime replacement eligible Lifetime Replacement

More About Engine Cooling Parts

Optimize your engine cooling system performance and heater output with quality drive belts, coolant hoses, cooling system parts, and approved coolant fluids from ECS Tuning. Head off expensive repairs and untimely breakdowns with regularly scheduled cooling system inspection and maintenance.

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