Mishimoto racing thermostat for the Volkswagen Golf GTI, Jetta, Beetle, Passat and Audi A4 / TT (1.8T and 2.0L). It activates at 180°F — lower than the ~189°F stock unit — letting coolant flow through the engine earlier to maintain cooler temperatures. Direct-fit replacement, backed by the Mishimoto Lifetime Warranty.
Specifications
| Type | Racing thermostat |
| Activation Temp | 180°F (vs. ~189°F stock) |
| Engine | VW/Audi 1.8T / 2.0L |
| Part Number | MMTS-GTI-99 |
| Warranty | Lifetime |
| Application | VW Golf GTI / Jetta / Beetle / Passat, Audi A4 / TT (see fitment) |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1997-2002 | Audi | A4 / A4 Quattro | Base / Avant |
| 2000-2006 | Audi | TT / TT Quattro | Base |
| 1998-2005 | Volkswagen | Beetle | GL / GLS / GLX / Turbo S |
| 1999-2006 | Volkswagen | Golf / GTI | GL / GLS / GTI 1.8T / 337 / 20th Anniversary |
| 1999-2015 | Volkswagen | Jetta | GL / GLS / GLI / TDI / S |
| 1998-2005 | Volkswagen | Passat | GL / GLS |
Shipping
- In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
- Standard, expedited, and overnight options at checkout.
- Oversized items ship by freight and take longer.
- Backordered items ship as soon as stock lands — contact us for lead times.
- International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.
Returns
- 30-day returns on new, uninstalled items in original packaging with all hardware.
- Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
- Installed or used parts can’t be returned — confirm fitment before you install.
- Special orders and custom items are final sale.
- Email us for return authorization before shipping anything back.
Full details: Shipping Policy · Refund Policy
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