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Behr Thermot-Tronik TX 25 80D - Engine Coolant Thermostat
Product Overview
The Behr Thermot-Tronik Engine Coolant Thermostat TX 25 80D is engineered to meet OEM standards, ensuring optimal performance and reliability in your Audi or Volkswagen vehicle. With a critical role in regulating engine temperature, this thermostat is designed for precise fit and functionality, providing the necessary control for your vehicle's cooling system. Constructed from premium-grade materials, this thermostat offers durability and longevity, making it a trusted choice for both DIY enthusiasts and professional technicians. Choose Behr Thermot-Tronik TX 25 80D for dependable performance and peace of mind every time you service your vehicle.
Cross Reference Numbers
This Behr Thermot-Tronik TX 25 80D is equivalent to or replaces the following part numbers: 069 121 113, 035 121 113.
Vehicle Compatibility
- Audi S6 2.2 L5 (1995)
- Audi 80 2.3 L5 (1992–1995)
- Audi 100 2.3 L5 (1990–1991)
- Audi 200 2.2 L5 (1991)
- Audi 90 2.3 L5 (1990–1991)
- Audi Coupe Quattro 2.3 L5 (1991)
- Volkswagen EuroVan 2.5 L5 (1993–1995)
- Volkswagen Quantum 2.2 L5 (1988–1986)
- Audi 5000 2.2 L5 (1985–1988)
- Audi 4000 2.2 L5 (1982–1983)
This may also fit other applications. Please use the vehicle selector tool to verify fitment.
Why Shop at eEuroparts.com?
- Proven Expertise: Over 25 years of experience with European vehicles means we know your car inside and out.
- Exclusive Kits That Fitâ„¢ - complete repair solutions with no guesswork
- Fitment Confidence: Our accurate cataloging ensures you get the right part the first time.
- Fast, Reliable Shipping: Orders ship quickly from our U.S.-based warehouses.
- Transparent Pricing: Competitive prices with no hidden fees or surprise charges.
- Established Trust: Serving the European auto community since 2000.
Frequently Asked Questions
What does the Behr Thermot-Tronik TX 25 80D Engine Coolant Thermostat do?
The engine coolant thermostat regulates the flow of coolant through the engine and radiator, ensuring that the engine operates at its optimal temperature. It opens and closes based on the engine's temperature, preventing overheating and maintaining efficient performance.
How do I know if my Engine Coolant Thermostat needs replacement?
Common signs of a failing thermostat include engine overheating, fluctuating temperature gauge readings, coolant leaks, and poor engine performance. If you experience any of these symptoms, it may be time to replace your thermostat.
Can I install the Behr Thermot-Tronik TX 25 80D myself?
Yes, the installation of the Behr Thermot-Tronik TX 25 80D can be a DIY project for those with basic mechanical skills. However, it is important to follow the service manual for your specific vehicle and take necessary precautions when working with the cooling system.
What are the symptoms of a faulty Engine Coolant Thermostat?
Symptoms of a faulty thermostat include engine overheating, erratic temperature gauge readings, coolant leaks, and reduced engine performance. If you see DTCs such as P0128, P0116, it may indicate a failing thermostat.
Why should I choose Behr Thermot-Tronik for my Engine Coolant Thermostat needs?
Behr Thermot-Tronik is known for its quality and reliability in the automotive industry. Order Behr Thermot-Tronik TX 25 80D today for a factory-correct replacement that restores safety and performance.
Note: All information on this page and in the FAQ is for general reference only. Verify fitment and consult a professional as needed. eEuroparts.com is not responsible for incorrect part selection or installation.
- BrandBehr Thermot-Tronik
- ManufacturerBehr Thermot-Tronik
- MPNTX 25 80D
- Part TypeEngine Coolant Thermostat
- OE Part Numbers035 121 113, 035121113, 069 121 113, 069121113
- Cross Reference NumbersTX2580D
- Fitment
- Fitment TypeVehicle Specific
| Year | Make | Model | Submodel | Notes |
|---|---|---|---|---|
| 1978 | Audi | 5000 | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1979 | Audi | 5000 | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1979 | Audi | 5000 | Base (2.0 L5 DIESEL) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1979 | Audi | 5000 | S (2.0 L5 DIESEL) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1979 | Audi | 5000 | S (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1980 | Audi | 4000 | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1980 | Audi | 5000 | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1980 | Audi | 5000 | Base (2.0 L5 DIESEL) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1980 | Audi | 5000 | S (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1980 | Audi | 5000 | S (2.0 L5 DIESEL) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1980 | Audi | 5000 | S Turbo (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1981 | Audi | 4000 | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1981 | Audi | 5000 | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1981 | Audi | 5000 | Base (2.0 L5 DIESEL) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1981 | Audi | 5000 | S (2.0 L5 DIESEL) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1981 | Audi | 5000 | S (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1981 | Audi | 5000 | S Turbo (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1981 | Audi | Coupe | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1982 | Audi | 4000 | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1982 | Audi | 4000 | GT (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1982 | Audi | 4000 | S (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1982 | Audi | 5000 | Base (2.0 L5 DIESEL) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1982 | Audi | 5000 | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1982 | Audi | 5000 | S (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1982 | Audi | 5000 | S Turbo (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1982 | Audi | Coupe | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1983 | Audi | 4000 | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1983 | Audi | 4000 | GT (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1983 | Audi | 4000 | S (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1983 | Audi | 5000 | Base (2.0 L5 DIESEL) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1983 | Audi | 5000 | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1983 | Audi | 5000 | S (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1983 | Audi | 5000 | S Turbo (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1983 | Audi | Coupe | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1983 | Volkswagen | Quantum | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1983 | Volkswagen | Quantum | GL (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1984 | Audi | 5000 | S (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1984 | Audi | 5000 | S Turbo (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1984 | Audi | 4000 Quattro | S (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1984 | Volkswagen | Quantum | GL (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1984 | Volkswagen | Quantum | Wolfsburg Edition (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1985 | Audi | 5000 | CS Turbo (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1985 | Audi | 5000 | S (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1985 | Audi | 5000 | S Turbo (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1985 | Audi | 4000 Quattro | S (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1986 | Audi | Coupe | GT (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1986 | Audi | 4000 Quattro | CS (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1986 | Audi | 5000 | CS (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1986 | Audi | 5000 | S (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1986 | Audi | 5000 Quattro | CS (2.2 L5 GAS) | |
| 1986 | Volkswagen | Quantum | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1986 | Volkswagen | Quantum | GL (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1986 | Volkswagen | Quantum | Syncro (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1987 | Audi | Coupe | GT (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1987 | Audi | Coupe | GT (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1987 | Audi | 4000 Quattro | CS (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1987 | Audi | 5000 | CS (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1987 | Audi | 5000 | S (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1987 | Audi | 5000 | S (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1987 | Volkswagen | Quantum | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1987 | Volkswagen | Quantum | GL (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1987 | Volkswagen | Quantum | Syncro (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1988 | Audi | 80 Quattro | Base (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1988 | Audi | 90 | Base (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1988 | Audi | 90 Quattro | Base (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1988 | Audi | 5000 | CS (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1988 | Audi | 5000 | S (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1988 | Volkswagen | Quantum | GL (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1988 | Volkswagen | Quantum | Syncro (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1989 | Audi | 100 | Base (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1989 | Audi | 100 | E (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1989 | Audi | 100 Quattro | Base (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1989 | Audi | 200 | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1989 | Audi | 200 Quattro | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1989 | Audi | 80 Quattro | Base (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1989 | Audi | 90 | Base (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1989 | Audi | 90 Quattro | Base (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1990 | Audi | 100 | Base (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1990 | Audi | 100 Quattro | Base (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1990 | Audi | 200 | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1990 | Audi | 200 Quattro | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1990 | Audi | 80 Quattro | Base (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1990 | Audi | 90 | Base (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1991 | Audi | 100 | Base (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1991 | Audi | 100 Quattro | Base (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1991 | Audi | 200 | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1991 | Audi | 80 | Base (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1991 | Audi | 80 Quattro | Base (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1991 | Audi | 90 | Base (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1991 | Audi | 200 Quattro | 20v (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1991 | Audi | 200 Quattro | 20v Avant (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1991 | Audi | 200 Quattro | Avant (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1991 | Audi | 200 Quattro | Base (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1992 | Audi | 80 | Base (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1992 | Audi | 80 Quattro | Base (2.3 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1993 | Volkswagen | EuroVan | CL (2.5 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1993 | Volkswagen | EuroVan | GL (2.5 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1993 | Volkswagen | EuroVan | MV (2.5 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1995 | Volkswagen | EuroVan | Camper (2.5 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
| 1995 | Audi | S6 | Avant (2.2 L5 GAS) | Notes: Discontinued - OE Quality, 80c with Gasket |
Warranty Overview
At eEuroparts, we stand behind the quality of the products we sell. Every part we offer is backed by a warranty designed to give you peace of mind and protect your investment.
Standard Warranty – Most Parts
Coverage: 2 years or 24,000 miles (whichever comes first) from purchase date.
Protection: Defects in materials or workmanship under normal personal use.
Eligibility: Applies only to the original purchaser and the vehicle where the part was first installed.
Exclusions:
Wear-and-tear items (brake pads, filters, bulbs, wipers, etc.)
Commercial, fleet, rideshare, off-road, or racing use
Improper installation, misuse, accidents, or modifications
Not Covered: Labor, shipping, towing, or incidental costs.
Bison Performance Warranty – Our House Brand
Coverage: Limited Lifetime Warranty for as long as you own your vehicle.
Applies To: All products sold under the Bison Performance label.
Premium Protection: Goes beyond our standard warranty — if it’s a Bison product, the 2-year/24k mile limit is replaced with lifetime coverage.
Exclusions: Same as the standard warranty (normal wear, commercial use, improper installation, etc.).
What’s Included: Replacement of the defective product (labor and shipping excluded).
Warranty Claim Requirements
To keep claims fast and fair, we require:
Proof of purchase (invoice or order confirmation).
Photos or videos showing the defective part, order number, date, VIN, and odometer reading.
Diagnostic reports or part returns for non-visible issues may be requested.
Claims must be truthful, properly documented, and reflect normal consumer use.
Buy With Confidence: We back our products because we believe in their quality, with a transparent, customer-first warranty process you can trust. And with Bison Performance products, you’ll enjoy Limited Lifetime protection—an assurance few brands can match.
For full details and exclusions, please see our complete Warranty Terms & Conditions.
This summary is for convenience only. For full warranty coverage details, exclusions, and requirements, see our official Warranty Terms & Conditions. In case of conflict, the full policy governs.
Return Policy Overview
Most parts can be returned within 30 days of delivery if unused, uninstalled, and in original packaging.
To start a return, contact customer support via Chat or Contact Us.
Restocking fee: Up to 20% may apply for certain orders (buyer’s remorse, order errors, or special-order items)
Refunds: Issued to your original payment method within 3–5 business days after inspection
Exchanges: Not automatic — please return and reorder
Replacements: May be approved for incorrect or defective items reported within 7 days
Not returnable:
Used or installed parts
Electrical components
Opened filter kits, gaskets, or contaminated items
Final sale or custom orders
Important Notes:
Return shipping is your responsibility unless we made a verified error
Fitment is the customer’s responsibility (we can assist, but do not guarantee)
Country of origin may vary and is not grounds for return
For complete details, please see our full Return Policy.
This Returns summary is provided for convenience only. All returns, refunds, and exchanges are subject to the complete Returns Policy. In the event of any conflict, the full policy governs.
Fast, Reliable Shipping — Straight to Your Door
We ship most orders the same day when placed before 2 PM CST (Monday–Friday). Our main warehouse is just east of Nashville, TN, and we also ship from multiple locations nationwide to get your order to you as quickly as possible.
We use trusted carriers like UPS, FedEx, and USPS.
Tracking info is emailed to you as soon as your order ships.
Delivery estimates at checkout are based on carrier data, but not guaranteed.
Need help with a shipment?
If your order is missing, damaged, or incorrect, just let us know within 5 days of delivery. We’ll walk you through the quick claim process — including a few photos to help us make things right.
For complete details, please see our full Shipping Policy.
This Shipping summary is provided for convenience only. Delivery times, carrier terms, fees, restrictions, risk of loss, and other details are governed by our complete Shipping Policy. In the event of any conflict, the full policy governs.




