URO 443121321 Engine Coolant Reservoir Cap

Name: URO 443121321 Engine Coolant Reservoir Cap
Brand: URO
SKU: DDWC-443121321
Price: 10.13 USD
Availability: InStock

176 vehicles fit this part

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OE Direct Replacement — Bolt-on fit, no modifications needed

Fitment: Audi and Volkswagen, 100, 100 Quattro, 200, 200 Quattro, 4000, 4000 Quattro, 5000 Quattro, 80, 80 Quattro, 90, 90 Quattro, A4, A4 Quattro, A6, A6 Quattro, A8, A8 Quattro, Cabriolet, Coupe, Coupe Quattro, Golf, Jetta, Quattro, Rabbit Convertible, Rabbit Pickup, S4, S6, S8, and V8 Quattro

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Not what you need? See all Engine Coolant Reservoir Cap options

Engine Coolant Reservoir Cap for Audi and Volkswagen

This URO engine coolant reservoir cap is a direct-fit replacement for a wide range of Audi and Volkswagen cooling system applications. Built to match OE cap dimensions, it helps restore proper sealing and pressure control in the coolant recovery tank.

Part number 443121321 is a practical choice for Audi A4, A6, 80, 90, 100, 200, Coupe, Quattro, and Volkswagen Cabriolet, Golf, Jetta, Rabbit, and Rabbit Pickup applications where the original cap no longer seals correctly.

Precision-molded to OE cap dimensions for proper tank compatibility
Quality cap and seal materials resist engine heat and cooling system exposure
Factory pressure-tested for consistent sealing performance
Guaranteed fitment for listed applications
24 Month Unlimited Mileage Warranty

Detailed Product Overview

URO 443121321 is an engine coolant reservoir cap designed for original and aftermarket coolant recovery tanks used across older Audi and Volkswagen platforms. It helps maintain the pressure needed for stable cooling system operation while providing a secure seal at the reservoir opening. This part cross-references VAICO V10-0018 for the same application.

What It Helps Solve

Coolant loss from a cap that no longer seals tightly
Pressure-related overflow from a worn or damaged reservoir cap
Cooling system service issues caused by heat-aged seal materials
Fitment problems when replacing an OE-style coolant tank cap
Intermittent coolant recovery tank sealing concerns on Audi and Volkswagen models

Installation Notes and Tips

Inspect the reservoir neck and sealing surface before installation. Confirm the cap seats fully and locks in place without resistance. If the cooling system has repeated pressure loss, check the tank, hoses, and related components for wear or damage. Fits 1997-2003 Audi A8 Quattro, N/A; Fits 2001-2003 Audi S8, N/A; Fits 1997-1999 Audi A8, N/A; Fits 1998 Audi A6, N/A; Fits 1995-1998 Audi A6 Quattro, N/A; Fits 1994-1998 Audi Cabriolet, N/A; Fits 1995-1997 Audi A6, N/A; Fits 1996 Audi A4, N/A; Fits 1996 Audi A4 Quattro, N/A; Fits 1993-1995 Audi 90, N/A; Fits 1988-1991 Audi 90, N/A; Fits 1993-1995 Audi 90 Quattro, N/A; Fits 1988-1991 Audi 90 Quattro, N/A; Fits 1995 Audi S6, N/A; Fits 1989-1994 Audi 100, N/A; Fits 1989-1994 Audi 100 Quattro, N/A; Fits 1992-1994 Audi S4, N/A; Fits 1990-1994 Audi V8 Quattro, N/A; Fits 1985-1993 Volkswagen Cabriolet, N/A; Fits 1988-1992 Audi 80, N/A; Fits 1988-1992 Audi 80 Quattro, N/A; Fits 1989-1991 Audi 200, N/A; Fits 1989-1991 Audi 200 Quattro, N/A; Fits 1990-1991 Audi Coupe Quattro, N/A; Fits 1990 Volkswagen Golf, N/A; Fits 1990 Volkswagen Jetta, N/A; Fits 1985-1989 Volkswagen Golf, N/A; Fits 1985-1989 Volkswagen Jetta, N/A; Fits 1980-1983 Volkswagen Jetta, N/A; Fits 1986-1988 Audi 5000 Quattro, N/A; Fits 1980-1987 Audi 4000, N/A; Fits 1984-1987 Audi 4000 Quattro, N/A; Fits 1981-1987 Audi Coupe, N/A; Fits 1986-1987 Volkswagen Jetta, N/A; Fits 1983-1985 Audi Quattro, N/A; Fits 1982-1984 Volkswagen Jetta, N/A; Fits 1980-1984 Volkswagen Rabbit Convertible, N/A; Fits 1980-1983 Volkswagen Rabbit Pickup, N/A; Fits 1981-1983 Volkswagen Rabbit Pickup, N/A.

Quality Assurance

This cap is factory pressure-tested and backed by a 24 Month Unlimited Mileage Warranty. URO 443121321 is built with materials selected to handle engine heat and the demanding environment inside the cooling system.

This part fits 176 vehicles. Search below:

Year	Make	Model	Submodel	Liters	Cylinders	Fuel Type	Position	Notes
2003	Audi	A8 Quattro					N/A
2003	Audi	S8					N/A
2002	Audi	A8 Quattro					N/A
2002	Audi	S8					N/A
2001	Audi	A8 Quattro					N/A
2001	Audi	S8					N/A
2000	Audi	A8 Quattro					N/A
1999	Audi	A8					N/A
1999	Audi	A8 Quattro					N/A
1998	Audi	A6					N/A	Chassis Range: Thru 4A-W-005000
1998	Audi	A6 Quattro					N/A
1998	Audi	A8					N/A
1998	Audi	A8 Quattro					N/A
1998	Audi	Cabriolet					N/A
1997	Audi	A6					N/A
1997	Audi	A6 Quattro					N/A
1997	Audi	A8					N/A
1997	Audi	A8 Quattro					N/A
1997	Audi	Cabriolet					N/A
1996	Audi	A4					N/A
1996	Audi	A4 Quattro					N/A	Chassis Range: Thru 8D-T-308000
1996	Audi	A6					N/A
1996	Audi	A6 Quattro					N/A
1996	Audi	Cabriolet					N/A
1995	Audi	90					N/A
1995	Audi	90 Quattro					N/A
1995	Audi	A6					N/A
1995	Audi	A6 Quattro					N/A
1995	Audi	Cabriolet					N/A
1995	Audi	S6					N/A
1994	Audi	100					N/A
1994	Audi	100 Quattro					N/A
1994	Audi	90					N/A
1994	Audi	90 Quattro					N/A
1994	Audi	Cabriolet					N/A
1994	Audi	S4					N/A
1994	Audi	V8 Quattro					N/A
1993	Audi	100					N/A
1993	Audi	100 Quattro					N/A
1993	Audi	90					N/A
1993	Audi	90 Quattro					N/A
1993	Audi	S4					N/A
1993	Audi	V8 Quattro					N/A
1993	Volkswagen	Cabriolet					N/A
1992	Audi	100					N/A
1992	Audi	100 Quattro					N/A
1992	Audi	80					N/A
1992	Audi	80 Quattro					N/A
1992	Audi	S4					N/A
1992	Audi	V8 Quattro					N/A
1992	Volkswagen	Cabriolet					N/A
1991	Audi	100					N/A
1991	Audi	100 Quattro					N/A
1991	Audi	200					N/A
1991	Audi	200 Quattro					N/A
1991	Audi	80					N/A
1991	Audi	80 Quattro					N/A
1991	Audi	90					N/A
1991	Audi	90 Quattro					N/A
1991	Audi	Coupe Quattro					N/A
1991	Audi	V8 Quattro					N/A
1991	Volkswagen	Cabriolet					N/A
1990	Audi	100					N/A
1990	Audi	100 Quattro					N/A
1990	Audi	200					N/A
1990	Audi	200 Quattro					N/A
1990	Audi	80					N/A
1990	Audi	80 Quattro					N/A
1990	Audi	90					N/A
1990	Audi	90 Quattro					N/A
1990	Audi	Coupe Quattro					N/A
1990	Audi	V8 Quattro					N/A
1990	Volkswagen	Cabriolet					N/A
1990	Volkswagen	Golf		1.8L	L4		N/A	Chassis Range: To 006 600
1990	Volkswagen	Jetta					N/A	Mexican Production; Chassis Range: To 006 600
1990	Volkswagen	Jetta		1.6L	L4		N/A	Mexican Production; Chassis Range: To 006 600
1990	Volkswagen	Jetta		1.8L	L4		N/A	Mexican Production; Chassis Range: To 006 600
1989	Audi	100					N/A
1989	Audi	100 Quattro					N/A
1989	Audi	200					N/A
1989	Audi	200 Quattro					N/A
1989	Audi	80					N/A
1989	Audi	80 Quattro					N/A
1989	Audi	90					N/A
1989	Audi	90 Quattro					N/A
1989	Volkswagen	Cabriolet					N/A
1989	Volkswagen	Golf	GL	1.8L	L4		N/A
1989	Volkswagen	Golf	GTI 16-Valve				N/A
1989	Volkswagen	Jetta		1.6L	L4		N/A
1989	Volkswagen	Jetta		1.8L	L4		N/A
1989	Volkswagen	Jetta	Carat				N/A
1989	Volkswagen	Jetta	GLI 16-Valve				N/A
1988	Audi	5000 Quattro					N/A
1988	Audi	80					N/A
1988	Audi	80 Quattro					N/A
1988	Audi	90					N/A
1988	Audi	90 Quattro					N/A
1988	Volkswagen	Cabriolet					N/A
1988	Volkswagen	Golf		1.8L	L4		N/A
1988	Volkswagen	Jetta	Carat				N/A
1988	Volkswagen	Jetta	GL	1.8L	L4		N/A
1988	Volkswagen	Jetta	GLI 16-Valve				N/A
1987	Audi	4000					N/A
1987	Audi	4000 Quattro					N/A
1987	Audi	5000 Quattro					N/A
1987	Audi	Coupe					N/A
1987	Volkswagen	Cabriolet					N/A
1987	Volkswagen	Golf	GL				N/A
1987	Volkswagen	Golf	GT				N/A
1987	Volkswagen	Golf	GTI				N/A
1987	Volkswagen	Golf	GTI 16-Valve				N/A
1987	Volkswagen	Jetta	GL	1.6L	L4		N/A
1987	Volkswagen	Jetta	GL	1.8L	L4		N/A	Exc. Turbo Diesel - w/ A/C; Chassis Range: To 006 600
1987	Volkswagen	Jetta	GLI				N/A
1987	Volkswagen	Jetta	GLI 16-Valve				N/A
1987	Volkswagen	Jetta	Wolfsburg Edition	1.6L	L4		N/A
1987	Volkswagen	Jetta	Wolfsburg Edition	1.8L	L4		N/A
1986	Audi	4000		1.8L	L4		N/A
1986	Audi	4000 Quattro					N/A
1986	Audi	5000 Quattro					N/A
1986	Audi	Coupe					N/A
1986	Volkswagen	Cabriolet					N/A
1986	Volkswagen	Golf					N/A
1986	Volkswagen	Jetta	Base	1.6L	L4		N/A
1986	Volkswagen	Jetta	GL	1.6L	L4		N/A
1986	Volkswagen	Jetta	GL				N/A
1986	Volkswagen	Jetta	GL	1.8L	L4		N/A	Exc. Turbo Diesel - w/ A/C; Chassis Range: To 006 600
1986	Volkswagen	Jetta	GLI				N/A
1985	Audi	4000		1.8L	L4		N/A
1985	Audi	4000 Quattro					N/A
1985	Audi	Coupe					N/A
1985	Audi	Quattro					N/A
1985	Volkswagen	Cabriolet					N/A
1985	Volkswagen	Golf					N/A
1985	Volkswagen	Jetta	Base	1.6L	L4		N/A
1985	Volkswagen	Jetta	GL	1.6L	L4		N/A
1985	Volkswagen	Jetta	GL	1.8L	L4		N/A
1985	Volkswagen	Jetta	GL				N/A
1985	Volkswagen	Jetta	GLI				N/A
1984	Audi	4000		1.8L	L4		N/A
1984	Audi	4000 Quattro					N/A
1984	Audi	Coupe					N/A
1984	Audi	Quattro					N/A
1984	Volkswagen	Jetta	Base				N/A	w/ A/C
1984	Volkswagen	Jetta	GL	1.6L	L4		N/A	w/ A/C
1984	Volkswagen	Jetta	GL				N/A	w/ A/C
1984	Volkswagen	Rabbit Convertible					N/A
1983	Audi	4000					N/A
1983	Audi	Coupe					N/A
1983	Audi	Quattro					N/A
1983	Volkswagen	Jetta		1.6L	L4		N/A
1983	Volkswagen	Jetta				DIESEL	N/A	w/ A/C
1983	Volkswagen	Jetta	Base	1.7L	L4	GAS	N/A	w/ A/C
1983	Volkswagen	Rabbit Convertible					N/A
1983	Volkswagen	Rabbit Pickup				GAS	N/A
1983	Volkswagen	Rabbit Pickup				DIESEL	N/A	Exc. Turbo Diesel
1982	Audi	4000		1.6L	L4		N/A
1982	Audi	4000		1.7L	L4		N/A
1982	Audi	Coupe					N/A
1982	Volkswagen	Jetta				GAS	N/A
1982	Volkswagen	Jetta		1.6L	L4		N/A
1982	Volkswagen	Jetta				DIESEL	N/A	w/ A/C
1982	Volkswagen	Rabbit Convertible					N/A
1982	Volkswagen	Rabbit Pickup				GAS	N/A
1982	Volkswagen	Rabbit Pickup				DIESEL	N/A	Exc. Turbo Diesel
1981	Audi	4000					N/A
1981	Audi	Coupe					N/A
1981	Volkswagen	Jetta		1.6L	L4		N/A
1981	Volkswagen	Jetta	Base	1.7L	L4		N/A
1981	Volkswagen	Rabbit Convertible					N/A
1981	Volkswagen	Rabbit Pickup				GAS	N/A
1981	Volkswagen	Rabbit Pickup				DIESEL	N/A	Exc. Turbo Diesel
1980	Audi	4000					N/A
1980	Volkswagen	Jetta					N/A
1980	Volkswagen	Rabbit Convertible					N/A
1980	Volkswagen	Rabbit Pickup					N/A

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

0226910225118 54029 280118 54029 589118 54029 738171 121 321D31335443 121 321443 121 321-E443121321URO-002826V10-0018

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.