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Audi A4 Engine Cooling Parts

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Coolant Temperature Sensor - 2 Pin

ES#3970965 - 025906041A - Coolant Temperature Sensor - 2 Pin - Blue sensor used by the ECU to control engine fueling - Meyle - Audi Volkswagen

Blue sensor used by the ECU to control engine fueling 5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!
From VIN 8D-W-007800 up to VIN 8D-X-199999, splits are in the 1998/1999 model years

Brand:
Meyle - Corporate Logo
ES#:
3970965
Mfg#:
025906041A
Ships on Sep 29, 2026
$9.99 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
In Stock
$9.98 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

Thermostat Housing

ES#2709988 - 06B121121l - Thermostat Housing - Located on the left side of the engine block - URO - Audi Volkswagen

Located on the left side of the engine block 2X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
2709988
Mfg#:
06B121121L
Ships in 1 Business Day
$4.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

cooling hose - supply

ES#4151135 - 06D121057L - cooling hose - supply - Connects the cooling supply pipes - Rein - Audi

Connects the cooling supply pipes 2X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

Brand:
Rein - Corporate Logo
ES#:
4151135
Mfg#:
06D121057L
Ships in 3 Business Days
$9.47 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Cap

ES#3970648 - 8E0121321 - Expansion Tank Cap - Plastic pressure cap for expansion tank - Meyle - Audi

Plastic pressure cap for expansion tank 5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

Brand:
Meyle - Corporate Logo
ES#:
3970648
Mfg#:
8E0121321
Ships on Sep 29, 2026
$9.16 USD
Free Shipping
on orders $49 and up

Radiator Drain Plug

ES#429383 - 8D0121100 - Radiator Drain Plug - Used for quick removal of coolant - Genuine Volkswagen Audi - Audi Volkswagen

Used for quick removal of coolant

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
429383
Mfg#:
8D0121100
Ships in 2 Business Days
10% off MSRP

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

$9.99

This product was last offered at the strikethrough price on
09-12-2026

$8.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Throttle Body Coolant Hose - Left

ES#4811056 - 078121188B - Throttle Body Coolant Hose - Left - Connects the coolant pipe to the throttle body - Vaico - Audi Volkswagen

Connects the coolant pipe to the throttle body We Price Match - Give Us A Call or Chat!
Engine code ATQ

Brand:
Vaico - Corporate Logo
ES#:
4811056
Mfg#:
078121188B
Ships in 1-2 days
$10.99

This product was last offered at the strikethrough price on
05-07-2026

$8.99 USD
Free Shipping
on orders $49 and up

Oil Cooler Hose - Supply

ES#2575462 - 06B121058S - Oil Cooler Hose - Supply - Connects the oil cooler to the hard water pipe - Meyle - Audi Volkswagen

Connects the oil cooler to the hard water pipe 5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

Brand:
Meyle - Corporate Logo
ES#:
2575462
Mfg#:
06B121058S
Ships on Dec 10, 2026
$8.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Radiator Attachment Bolt - Priced Each

ES#2670964 - 8D0121200 - Radiator Attachment Bolt - Priced Each - Secures the radiator to the core support - Genuine Volkswagen Audi - Audi

Secures the radiator to the core support

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
2670964
Mfg#:
8D0121200
Ships in 2 Business Days
$2.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Hose

ES#3183629 - 078121096H - Coolant Hose - Connects coolant pipe to oil cooler housing - MTC - Audi Volkswagen

Connects coolant pipe to oil cooler housing

Brand:
MTC - Corporate Logo
ES#:
3183629
Mfg#:
078121096H
Ships in 9 Business Days
$8.15 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat O-Ring

ES#3663825 - 06J121119B - Thermostat O-Ring - Create a leak-free seal between the thermostat and the water pump - Mahle - Audi

Create a leak-free seal between the thermostat and the water pump

Brand:
Mahle - Corporate Logo
ES#:
3663825
Mfg#:
06J121119B
Ships in 3 Business Days
$4.07 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

Expansion Tank Cap

ES#4066648 - 8E0121321 - Expansion Tank Cap - Hamburg Tech - Audi

We Price Match - Give Us A Call or Chat!

Brand:
Hamburg Tech - Corporate Logo
ES#:
4066648
Mfg#:
8E0121321
Ships in 1 Business Day
$7.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

O-Ring - Priced Each (24x3)

ES#11850 - n90380002 - O-Ring - Priced Each (24x3) - O-ring used in various areas on your European vehicle - Genuine Volkswagen Audi - Audi

O-ring used in various areas on your European vehicle 24x3 O-ring that is seated between the hard coolant pipe and thermostat housing

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
11850
Mfg#:
N90380002
In Stock
Limited Qty Sale
$5.99

This product was last offered at the strikethrough price on
06-23-2026

$3.99 USD
Free Shipping
on orders $49 and up
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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