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Febi 21188 Engine Coolant Reservoir
| Brand | Febi 21188 |
|---|---|
| Additional Information / Parts | with sensor |
| Material | Plastic |
| Fits | Audi · 13 vehicles |
Sensor included. Monitors coolant level for added system awareness.
Plastic construction. Lightweight reservoir material resists everyday wear.
Coolant reservoir. Stores excess coolant for stable system operation.
Cross-references 8A0 121 403 A, 431 121 407 C and 443 121 403 for the same application. See all 4.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Engine Coolant Reservoir for Audi Applications
Febi part 21188 is an engine coolant reservoir made from plastic and supplied with a sensor. It is built for select Audi cooling system applications where a direct-fit expansion tank is needed to manage coolant level and system pressure. This Febi coolant reservoir fits 1986-1991 Audi 4000, 5000 Quattro, 80, 100, 100 Quattro, and 4000 Quattro applications listed below.
Key Features
- Engine coolant reservoir for cooling system service
- Plastic construction for OE-style fitment
- Includes sensor provision as listed in the product attributes
- Febi part number 21188 for catalog matching
- Fits select Audi 4000, 5000 Quattro, 80, 100, and 100 Quattro models
Product Details
Febi 21188 is a replacement coolant expansion tank for vehicles that use a plastic reservoir with sensor integration. The febi product line is known for application-specific replacement parts, and this reservoir follows that approach for Audi cooling system service. Use this part when replacing a cracked, leaking, or sensor-equipped coolant tank on the listed Audi 100, Audi 80, and related models. This part cross-references OE-style numbers such as 8A0 121 403 A and 431 121 407 C for the same application.
Fitment
- Fits 1991 Audi 100 Quattro, N/A; Material: Plastic; febi
- Fits 1989-1990 Audi 100, N/A
- Fits 1989-1990 Audi 100 Quattro, N/A
- Fits 1988-1990 Audi 80, N/A
- Fits 1986-1988 Audi 5000 Quattro, N/A; Material: Plastic; febi
- Fits 1986-1987 Audi 4000, N/A; Material: Plastic; febi
Common Replacement Reasons
- Coolant reservoir cracking or splitting
- Coolant level sensor warning issues
- Visible coolant seepage around the expansion tank
- Loss of coolant from an aging plastic reservoir
- Replacement during cooling system repair on Audi 100, Audi 80, or Audi 5000 Quattro models
Installation Notes and Tips
Verify the reservoir shape, sensor provision, and hose connections against the original tank before installation. Inspect the cap, hoses, and mounting points for wear while servicing the cooling system. After installation, refill with the correct coolant mixture and bleed the system according to the vehicle service procedure.
Quality Assurance
Febi replacement parts are cataloged for specific vehicle applications and OE-style interchange matching. Confirm part number 21188 against the original reservoir and listed cross-reference numbers before ordering.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 1991 | Audi | 100 Quattro | — | — | N/A | Material: Plastic; febi |
| 1990 | Audi | 100 | — | — | N/A | — |
| 1990 | Audi | 100 Quattro | — | — | N/A | — |
| 1990 | Audi | 80 | — | — | N/A | — |
| 1989 | Audi | 100 | — | — | N/A | — |
| 1989 | Audi | 100 Quattro | — | — | N/A | — |
| 1989 | Audi | 80 | — | — | N/A | — |
| 1988 | Audi | 5000 Quattro | — | — | N/A | Material: Plastic; febi |
| 1988 | Audi | 80 | — | — | N/A | — |
| 1987 | Audi | 4000 | — | — | N/A | Material: Plastic; febi |
| 1987 | Audi | 5000 Quattro | — | — | N/A | Material: Plastic; febi |
| 1986 | Audi | 4000 | 1.8L | L4 | N/A | Material: Plastic; febi |
| 1986 | Audi | 5000 Quattro | — | — | N/A | Material: Plastic; febi |
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