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Volkswagen Passat B4 TDI Engine Cooling Parts

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Coolant Flange

ES#3970404 - 028121132A - Coolant Flange - Located on the left side of the cylinder head, includes O-Ring - Meyle - Volkswagen

Located on the left side of the cylinder head, includes O-Ring 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!
AHU & 1Z Engine codes only

Brand:
Meyle - Corporate Logo
ES#:
3970404
Mfg#:
028121132A
In Stock at Vendor
$8.85 USD
Free Shipping
on orders $49 and up

Expansion Tank Cap

ES#2814240 - 1H0121321A - Expansion Tank Cap - Replacement cap for your broken or lost piece - Hamburg Tech - Volkswagen

Replacement cap for your broken or lost piece We Price Match - Give Us A Call or Chat!

Brand:
Hamburg Tech - Corporate Logo
ES#:
2814240
Mfg#:
1H0121321A
Ships in 2 Business Days
$8.15 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Cap

ES#2801726 - 1H0121321C - Expansion Tank Cap - Replacement cap for your broken or lost piece - Rein - Volkswagen

Replacement cap for your broken or lost piece 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Rein - Corporate Logo
ES#:
2801726
Mfg#:
1H0121321C
Back Ordered
$7.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Cap

ES#2535169 - 1H0121321A - Expansion Tank Cap - Replacement cap for your broken or lost piece - URO - Volkswagen

Replacement cap for your broken or lost piece 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
2535169
Mfg#:
1H0121321A
Ships in 2 Business Days
$3.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Thermostat Housing

ES#2535114 - 037121121A - Thermostat Housing - Common point of failure or leaking for the cooling system, does not include O-Rings - URO - Audi Volkswagen

Common point of failure or leaking for the cooling system, does not include O-Rings 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
2535114
Mfg#:
037121121A
Ships on Aug 6, 2026
$3.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Cap

ES#3672033 - 3C0121321 - Expansion Tank Cap - Keep proper pressure in your coolant system - Stant - Audi Volkswagen Porsche

Keep proper pressure in your coolant system

Brand:
Stant - Corporate Logo
ES#:
3672033
Mfg#:
3C0121321
Back Ordered
$5.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Flange

ES#2535192 - 026121144E - Coolant Flange - Located on the driver side of the cylinder head - URO - Audi Volkswagen

Located on the driver side of the cylinder head 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
URO - Corporate Logo
ES#:
2535192
Mfg#:
026121144E
Ships in 2 Business Days
$2.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

seal ring

ES#2865798 - 038117070A - seal ring - Seals the connection between the oil cooler and the filter adapter. 59x5 - Febi - Audi Volkswagen

Seals the connection between the oil cooler and the filter adapter. 59x5 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Febi - Corporate Logo
ES#:
2865798
Mfg#:
038117070A
Ships on Oct 15, 2026
$4.99 USD
Free Shipping
on orders $49 and up

Freeze Plug - 36mm

ES#2090865 - 059103113 - Freeze Plug - 36mm - Keep your engine block sealed - MTC - Audi Volkswagen

Keep your engine block sealed

Brand:
MTC - Corporate Logo
ES#:
2090865
Mfg#:
059103113
Ships in 10 Business Days
$1.01 USD
Free Shipping
on orders $49 and up

Expansion Tank Cap

ES#2090974 - 1H0121321C - Expansion Tank Cap - Keep proper pressure in your coolant system - MTC - Volkswagen

Keep proper pressure in your coolant system

Brand:
MTC - Corporate Logo
ES#:
2090974
Mfg#:
1H0121321C
Ships in 10 Business Days
$3.05 USD
Free Shipping
on orders $49 and up

Oil Filter Adapter Gasket

ES#2702530 - 028115441C - Oil Filter Adapter Gasket - Seals the oil filter adapter to the engine block - Elwis - Audi Volkswagen

Seals the oil filter adapter to the engine block

Brand:
Elwis - Corporate Logo
ES#:
2702530
Mfg#:
028115441C
In Stock at Vendor
$3.99

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

$2.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Flange

ES#2597921 - 026121144F - Coolant Flange - Located on the left side of your vehicles cylinder head - URO - Audi Volkswagen

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

Brand:
URO - Corporate Logo
ES#:
2597921
Mfg#:
026121144F
Ships in 2 Business Days
$2.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Oil Filter Adapter Gasket

Seals the oil filter adapter to the engine block 2X Entries For Our 25th Anniversary Sweepstakes!
We Price Match - Give Us A Call or Chat!

Brand:
Elring - Corporate Logo
ES#:
4034836
Mfg#:
028115441C
In Stock at Vendor
$3.99

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

$2.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Expansion Tank Cap

ES#2748888 - 1H0121321A - Expansion Tank Cap - Replacement cap for your broken or lost piece - MTC - Volkswagen

Replacement cap for your broken or lost piece

Brand:
MTC - Corporate Logo
ES#:
2748888
Mfg#:
1H0121321A
Ships in 10 Business Days
$2.99 USD
Free Shipping
on orders $49 and up

Coolant Flange

ES#2090801 - 026121144E - Coolant Flange - Located on the driver side of the cylinder head - MTC - Audi Volkswagen

Located on the driver side of the cylinder head

Brand:
MTC - Corporate Logo
ES#:
2090801
Mfg#:
026121144E
Ships in 10 Business Days
$2.99 USD
Free Shipping
on orders $49 and up
This product is lifetime replacement eligible Lifetime Replacement

Coolant Flange

ES#2090802 - 026121144F - Coolant Flange - Located on the left side of your vehicles cylinder head - MTC - Audi Volkswagen

Located on the left side of your vehicles cylinder head AAZ Engine code and automatic transmission only

Brand:
MTC - Corporate Logo
ES#:
2090802
Mfg#:
026121144F
In Stock
ON SALE! SAVE 68%
$1.99

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

$0.64 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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