# MotoRad 304-198 Engine Coolant Thermostat for 1999-2005 Audi A4

### Specifications

Bypass Diameter: 1.37"

Bypass Length: 1.50"

Flange Thickness: 0.05"

Gasket or Seal included: No

Installation Tool Included: No

Jiggle Pin Weep Hole: Yes

Sealing Flange Outside Diameter: 2.64"

Temperature (Degree): 198F

### Features

-   Offer precise pressure control
-   Ensure the proper fit
-   Made of high quality materials
-   Easy installation

### Product Details

Engine Coolant Thermostat (304-198) by MotoRad®. Temperature: 198F. State-of-the-art equipment, strict quality control, and functional testing to each thermostat ensure customers that they can trust the high-quality product used in their vehicle. As cooling system experts, MotoRad knows what is necessary to manufacture a high-quality part that will stand up to the rigors of today’s demanding cooling system environments where others fail.

MotoRad offers a full line of thermostats to replace original equipment thermostats. These parts are manufactured with high-grade duel bridge stainless steel construction and they meet or exceed all original equipment manufacturer requirements. MotoRad also offers standard thermostats in many alternate temperatures.

Brand: MotoRad

Part Number: 304-198

UPC: 055644304984

Alternate MPN: 304198

### Vehicle Fitment Table

Year

Make

Model

Position

Fitment Precision

Note

2000

Audi

A4

1999

Audi

A6

2000

Audi

A6

2001

Audi

A6

1999

Volkswagen

Passat

2000

Volkswagen

Passat

2001

Volkswagen

Passat

2002

Volkswagen

Passat

2003

Volkswagen

Passat

2004

Volkswagen

Passat

2005

Volkswagen

Passat

### FAQ

**Will this fit my vehicle?**  
Please verify your year, make, model, position, and any fitment notes using the Vehicle Fitment Table above before purchase.

**What part number is this?**  
The listed part number is 304-198.

**Is this product designed for direct replacement?**  
Yes. This product is intended to match the compatible vehicle applications listed in the fitment table.

**Should I confirm fitment before ordering?**  
Yes. Always compare your original part, position, and vehicle details with the fitment table before ordering.

### Common Searches

-   Engine Coolant Thermostat for Audi A4
-   304-198 fitment
-   MotoRad Engine Coolant Thermostat
-   2000 Audi A4 Engine Coolant Thermostat

## Details

- **Price:** 32.65 CAD
- **Vendor:** MotoRad
- **Type:** Engine Coolant Thermostat
- **Tags:** 1999-2001 Audi A6, 1999-2005 Volkswagen Passat, 2000 Audi A4, 304-198, Automotive, Engine Coolant Thermostat, MotoRad

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 32.65 CAD | In stock |

## Images

- MotoRad 304-198 Engine Coolant Thermostat for 1999-2005 Audi A4

---

> Source: [Standard Auto Part](https://www.standardautopart.com/products/motorad-304-198-engine-coolant-thermostat)
> Updated: 2026-08-17