Shop Our Clearance Sale - Up To 80% Off FREE SHIPPING on Orders $49+ *exclusions apply

Menu

Call Us330-331-2003 ChatLive Chat Text Us!
0 Shopping Cart
Your Vehicle Clear

Audi B5 A4 Quattro 1.8T

    • Audi
    • BMW
    • Mercedes Benz
    • MINI
    • Porsche
    • Volkswagen

Saved Vehicles

My Vehicles
You currently have no stored vehicles.

Recent Vehicles

Recent Vehicles Manage Vehicles

You currently have no recent vehicles.

We'll automatically keep fully selected vehicles here for your convenience.

Call Us330-331-2003 ChatLive Chat Text Us!
Track My Order View Order History Submit a Return Contact Us Wholesale Information Lifetime Replacement Returns and Warranty Information
0
Call Us330-331-2003 ChatLive Chat Text Us!
Track My Order View Order History Submit a Return Contact Us Wholesale Information Lifetime Replacement Returns and Warranty Information
Cancel
0
Sales & Specials
Enter Your Vehicle
garage-red
Your Vehicle Audi B5 A4 Quattro 1.8T
Your Vehicle Audi B5 A4 Quattro 1.8T
Change Clear

Audi B5 A4 Quattro 1.8T Engine Coolant Flanges & Parts

Sort By
Filter By
Return to Top

Coolant Flange Replacement Kit

ES#4017762 - CHS0645 - Coolant Flange Replacement Kit - A comprehensive kit designed to service the commonly failing cooling system components in a single repair. - Rein - Audi Volkswagen

A comprehensive kit designed to service the commonly failing cooling system components in a single repair. 2X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!
For vehicles with AEB & ATW engine codes with D-shaped coolant temp sensor

Brand:
Rein - Corporate Logo
ES#:
4017762
Mfg#:
CHS0645
In Stock
$56.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Sealing O-Ring - Priced Each

ES#3683 - N90365302 - Sealing O-Ring - Priced Each - Install a new o-ring for a proper seal. 20X3 - Corteco - Audi Volkswagen

Install a new o-ring for a proper seal. 20X3 Seals the coolant return pipe for AWM engine code only

Brand:
Corteco - Corporate Logo
ES#:
3683
Mfg#:
N90365302
In Stock
$4.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Allen/Hex Bolt - Priced Each

ES#6661 - N90945002 - Allen/Hex Bolt - Priced Each - Install new hardware with your new parts. M7x21.5mm - Genuine Volkswagen Audi - Audi Volkswagen

Install new hardware with your new parts. M7x21.5mm Engine code AWM. Secures the thermostat housing to the engine

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
6661
Mfg#:
N90945002
In Stock
Limited Qty Sale
29% off MSRP

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

$8.49

This product was last offered at the strikethrough price on
03-18-2026

$5.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Flange Plug Kit - Priced Each

ES#2535191 - 357121140 - Coolant Flange Plug Kit - Priced Each - Includes the plug, o-ring and securing clip - URO - Audi Volkswagen

Includes the plug, o-ring and securing clip 2X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
2535191
Mfg#:
357121140
In Stock
$4.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat O-Ring

ES#261234 - 038121119B - Thermostat O-Ring - Ensure a proper seal when installing your new thermostat. 50x4 - Genuine Volkswagen Audi - Audi Volkswagen

Ensure a proper seal when installing your new thermostat. 50x4

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
261234
Mfg#:
038121119B
In Stock
$7.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Cylinder Head Coolant Flange

ES#2712765 - 058121132C - Cylinder Head Coolant Flange - Located on the back of the cylinder head - Vaico - Audi Volkswagen

Located on the back of the cylinder head We Price Match - Give Us A Call or Chat!

Brand:
Vaico - Corporate Logo
ES#:
2712765
Mfg#:
058121132C
In Stock
$18.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Hex Bolt - Priced Each

ES#261821 - N0902619 - Hex Bolt - Priced Each - Install new hardware with your new parts. M6x20 - Genuine Volkswagen Audi - Audi Volkswagen

Install new hardware with your new parts. M6x20 Engine code AWM. Secures the coolant flange to the cylinder head

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
261821
Mfg#:
N0902619
In Stock
17% off MSRP

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

$3.38

This product was last offered at the strikethrough price on
08-23-2026

$2.82 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Cooling Flange Replacement Kit

ES#2804114 - 058121132CKT - Cooling Flange Replacement Kit - Cure the common coolant leak coming from the back of your engine compartment - Assembled By ECS - Audi

Cure the common coolant leak coming from the back of your engine compartment 10X Entries Into Our F80 M3 Sweepstakes
For vehicles with AWM engine code only

Brand:
Assembled By ECS - Corporate Logo
ES#:
2804114
Mfg#:
058121132CKT
Ships in 7 Business Days
ON SALE! SAVE 10%
$54.99

This product was last offered at the strikethrough price on
05-02-2026

$49.55 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat O-Ring - Priced Each

ES#2865801 - 038121119B - Thermostat O-Ring - Priced Each - Recommended when changing the thermostat - Febi - Audi Volkswagen

Recommended when changing the thermostat We Price Match - Give Us A Call or Chat!

Brand:
Febi - Corporate Logo
ES#:
2865801
Mfg#:
038121119B
In Stock
$5.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Flange Sealing O-Ring - Priced Each

ES#274529 - 037121687 - Coolant Flange Sealing O-Ring - Priced Each - Install a new o-ring for a proper seal. 36x3.15 - Genuine Volkswagen Audi - Audi Volkswagen

Install a new o-ring for a proper seal. 36x3.15 Seals the coolant flange to the cylinder head

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
274529
Mfg#:
037121687
In Stock
30% off MSRP

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

$7.08

This product was last offered at the strikethrough price on
08-23-2026

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

Cast Aluminum Cylinder Head Cooling Flange

ES#4070439 - 462-121-132b5KT - Cast Aluminum Cylinder Head Cooling Flange - Located on the back of the cylinder head - iABED Industries - Audi Volkswagen

Located on the back of the cylinder head For vehicles with AWM engine code only

Brand:
iABED Industries - Corporate Logo
ES#:
4070439
Mfg#:
462-121-132B5KT
Back Ordered
Auto Notify
$39.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Cooling Flange Replacement Kit

ES#2804122 - 058121132KT1 - Cooling Flange Replacement Kit - Cure the common coolant leak coming from the back of your engine compartment - Assembled By ECS - Audi

Cure the common coolant leak coming from the back of your engine compartment 10X Entries Into Our F80 M3 Sweepstakes
For vehicles with AEB & ATW engine codes with D-shaped coolant temp sensor

Brand:
Assembled By ECS - Corporate Logo
ES#:
2804122
Mfg#:
058121132KT1
Ships in 7 Business Days
ON SALE! SAVE 15%
$54.99

This product was last offered at the strikethrough price on
05-02-2026

$46.92 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat Housing

ES#2865688 - 030121121B - Thermostat Housing - Located on the water pump assembly - Febi - Audi Volkswagen

Located on the water pump assembly We Price Match - Give Us A Call or Chat!

Brand:
Febi - Corporate Logo
ES#:
2865688
Mfg#:
030121121B
In Stock
$9.22 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Hex Bolt - Priced Each

ES#469440 - N90280904 - Hex Bolt - Priced Each - Install new hardware with your new parts. M6x22 - Genuine Volkswagen Audi - Audi Volkswagen

Install new hardware with your new parts. M6x22 Engine codes AEB & ATW. Secures the thermostat housing to the water pump

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
469440
Mfg#:
N90280904
Ships in 3 Business Days
$9.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat Housing

ES#2804447 - 06B121121L - Thermostat Housing - Located on the left side of the engine block - Bremmen Parts - Audi Volkswagen

Located on the left side of the engine block 10X Entries Into Our F80 M3 Sweepstakes

Brand:
Bremmen Parts - Corporate Logo
ES#:
2804447
Mfg#:
06B121121L
In Stock
ON SALE! SAVE 27%
$9.99

This product was last offered at the strikethrough price on
05-02-2026

$7.34 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Flange Plug - Priced Each

ES#333289 - 357121140 - Coolant Flange Plug - Priced Each - Prevent leaks with a new plug - Genuine Volkswagen Audi - Audi Volkswagen

Prevent leaks with a new plug

Brand:
Genuine Volkswagen Audi - Corporate Logo
ES#:
333289
Mfg#:
357121140
Ships in 1-2 days
14% off MSRP

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

$13.99

This product was last offered at the strikethrough price on
08-23-2026

$11.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

More About Engine Coolant Flanges & Parts

Replace a cracked or failed coolant flange with a brand new coolant flange to stop those leaks!

ECS Tuning is not affiliated with any automobile manufacturers.
Manufacturer names and/or part numbers are used only for identification purposes.

Terms of Use Privacy Policy ECS Tuning is part of Enthusiast Auto Holdings