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Four Seasons 85955 Engine Coolant Thermostat Housing for 2001-2006 BMW 330Ci
Verify fitment before purchase — please check the Fitment section below.
Key Specifications
- Brand: Four Seasons
- Manufacturer Part Number: 85955
- Part Type: Engine Coolant Thermostat Housing
- Condition: New
- Warranty: 1 Year
Vehicle Compatibility
Fits select vehicle applications. Please enter your vehicle or check the Fitment section below to confirm compatibility.
Support efficient coolant circulation with this Four Seasons Engine Coolant Thermostat Housing. Designed to regulate coolant routing and temperature control, it helps protect the engine from overheating and maintain stable operating conditions.
Why replace this part? A faulty thermostat or coolant routing component can cause poor engine temperature regulation or overheating. Replacing it helps restore proper coolant circulation and maintain stable engine operating conditions.
Key Features & Benefits
- Regulated coolant flow — Ensures proper engine temperature control.
- Durable materials — Resists corrosion and withstands thermal cycles.
- Supports engine efficiency — Helps maintain stable operating conditions and prevent overheating.
Product Overview
Build Quality & Materials
- Durable design ensures stable coolant flow and temperature regulation.
- Engineered to resist wear from repeated thermal cycles and system pressure.
- Constructed for reliable operation under normal engine conditions.
Installation Notes
- Ensure the engine is cool before draining or servicing the cooling system.
- Inspect sealing surfaces and related components prior to installation.
- Refill and bleed the cooling system according to manufacturer specifications after installation.
Why Choose Four Seasons?
Four Seasons is a trusted leader in climate control and engine cooling components, supplying automotive replacement parts designed to support reliable system operation and long-term performance. With decades of industry experience, Four Seasons focuses on practical engineering solutions that help maintain comfort, efficiency, and dependability across a wide range of vehicle applications.
- Specialized focus on HVAC and engine cooling systems.
- Engineering-driven designs developed for consistent system operation.
- Components built for durability under normal driving conditions.
- Trusted by professional technicians and installers for reliable aftermarket solutions.
Four Seasons Engineering Advantage
Four Seasons applies proven engineering practices and application-specific design standards to develop components that support proper system function, consistent performance, and long-term reliability. Each part is designed to meet the operational demands of automotive HVAC and cooling systems, helping maintain stable performance under normal operating conditions.
Shipping & Warranty
- Fast U.S. shipping from our warehouse on business days.
- Free returns if the part does not fit or you are not satisfied (see store policy for details).
- 1-year warranty on this part from date of purchase.
Product Information
Item Specifics (Technical)
- California Proposition 65: Warning: This product contains a chemical known to the State of California to cause cancer.
- Description: Engine Coolant Components
- Gasket or Seal Included: Yes
- Inlet Dia. IN: 1.146 in
- Material: Aluminum
- Mnt Flange Width IN: 0.555 in
- Mount Hole Qty: 4
- Overall Height IN: 2.224 in
- Style: w/ Thermostat
- Thermostat Included?: Included
- Type: Integrated Thermostat Housing
Interchange Part Numbers
- 11530139877
- 11531436823
- 11531437040
- 11537509227
- 14602
- 33934
- 467185
- 6052019
- 815773
- 85955
- 902813
- TM1397
- W98485
- Fitment TypeVehicle Specific
| Year | Make | Model | Submodel | Notes |
|---|---|---|---|---|
| 1999 | BMW | 323i | Base (2.5L L6) | w/ Thermostat; New Body Style; |
| 1999 | BMW | 323is | Base (2.5L L6) | w/ Thermostat; New Body Style; |
| 1999 | BMW | 328i | Base (2.8L L6) | w/ Thermostat; New Body Style; |
| 1999 | BMW | 328is | Base (2.8L L6) | w/ Thermostat; New Body Style; |
| 1999 | BMW | 528i | Base (2.8L L6) | w/ Thermostat; |
| 1999 | BMW | Z3 | Coupe (2.8L L6) | w/ Thermostat; |
| 1999 | BMW | Z3 | Roadster (2.5L L6) | w/ Thermostat; |
| 1999 | BMW | Z3 | Roadster (2.8L L6) | w/ Thermostat; |
| 2000 | BMW | 323Ci | Base (2.5L L6) | w/ Thermostat; |
| 2000 | BMW | 323i | Base (2.5L L6) | w/ Thermostat; |
| 2000 | BMW | 328Ci | Base (2.8L L6) | w/ Thermostat; |
| 2000 | BMW | 328i | Base (2.8L L6) | w/ Thermostat; |
| 2000 | BMW | 528i | Base (2.8L L6) | w/ Thermostat; |
| 2000 | BMW | Z3 | Coupe (2.8L L6) | w/ Thermostat; |
| 2000 | BMW | Z3 | Roadster (2.5L L6) | w/ Thermostat; |
| 2000 | BMW | Z3 | Roadster (2.8L L6) | w/ Thermostat; |
| 2001 | BMW | 325Ci | Base (2.5L L6) | w/ Thermostat; |
| 2001 | BMW | 325i | Base (2.5L L6) | w/ Thermostat; |
| 2001 | BMW | 325xi | Base (2.5L L6) | w/ Thermostat; |
| 2001 | BMW | 330Ci | Base (3.0L L6) | w/ Thermostat; |
| 2001 | BMW | 330i | Base (3.0L L6) | w/ Thermostat; |
| 2001 | BMW | 330xi | Base (3.0L L6) | w/ Thermostat; |
| 2001 | BMW | 525i | Base (2.5L L6) | w/ Thermostat; |
| 2001 | BMW | 530i | Base (3.0L L6) | w/ Thermostat; |
| 2001 | BMW | X5 | 3.0i (3.0L L6) | w/ Thermostat; |
| 2001 | BMW | Z3 | Coupe (3.0L L6) | w/ Thermostat; |
| 2001 | BMW | Z3 | Roadster (2.5L L6) | w/ Thermostat; |
| 2001 | BMW | Z3 | Roadster (3.0L L6) | w/ Thermostat; |
| 2002 | BMW | 325Ci | Base (2.5L L6) | w/ Thermostat; |
| 2002 | BMW | 325i | Base (2.5L L6) | w/ Thermostat; |
| 2002 | BMW | 325xi | Base (2.5L L6) | w/ Thermostat; |
| 2002 | BMW | 330Ci | Base (3.0L L6) | w/ Thermostat; |
| 2002 | BMW | 330i | Base (3.0L L6) | w/ Thermostat; |
| 2002 | BMW | 330xi | Base (3.0L L6) | w/ Thermostat; |
| 2002 | BMW | 525i | Base (2.5L L6) | w/ Thermostat; |
| 2002 | BMW | 530i | Base (3.0L L6) | w/ Thermostat; |
| 2002 | BMW | X5 | 3.0i (3.0L L6) | w/ Thermostat; |
| 2002 | BMW | Z3 | Coupe (3.0L L6) | w/ Thermostat; |
| 2002 | BMW | Z3 | Roadster (2.5L L6) | w/ Thermostat; |
| 2002 | BMW | Z3 | Roadster (3.0L L6) | w/ Thermostat; |
| 2003 | BMW | 325Ci | Base (2.5L L6) | w/ Thermostat; |
| 2003 | BMW | 325i | Base (2.5L L6) | w/ Thermostat; |
| 2003 | BMW | 325xi | Base (2.5L L6) | w/ Thermostat; |
| 2003 | BMW | 330Ci | Base (3.0L L6) | w/ Thermostat; |
| 2003 | BMW | 330i | Base (3.0L L6) | w/ Thermostat; |
| 2003 | BMW | 330xi | Base (3.0L L6) | w/ Thermostat; |
| 2003 | BMW | 525i | Base (2.5L L6) | w/ Thermostat; |
| 2003 | BMW | 530i | Base (3.0L L6) | w/ Thermostat; |
| 2003 | BMW | X5 | 3.0i (3.0L L6) | w/ Thermostat; |
| 2003 | BMW | Z4 | 2.5i (2.5L L6) | w/ Thermostat; |
| 2003 | BMW | Z4 | 3.0i (3.0L L6) | w/ Thermostat; |
| 2004 | BMW | 325Ci | Base (2.5L L6) | w/ Thermostat; |
| 2004 | BMW | 325i | Base (2.5L L6) | w/ Thermostat; |
| 2004 | BMW | 325xi | Base (2.5L L6) | w/ Thermostat; |
| 2004 | BMW | 330Ci | Base (3.0L L6) | w/ Thermostat; |
| 2004 | BMW | 330i | Base (3.0L L6) | w/ Thermostat; |
| 2004 | BMW | 330xi | Base (3.0L L6) | w/ Thermostat; |
| 2004 | BMW | 525i | Base (2.5L L6) | w/ Thermostat; |
| 2004 | BMW | 530i | Base (3.0L L6) | w/ Thermostat; |
| 2004 | BMW | X3 | 3.0i (3.0L L6) | w/ Thermostat; |
| 2004 | BMW | X5 | 3.0i (3.0L L6) | w/ Thermostat; |
| 2004 | BMW | Z4 | 2.5i (2.5L L6) | w/ Thermostat; |
| 2004 | BMW | Z4 | 3.0i (3.0L L6) | w/ Thermostat; |
| 2005 | BMW | 325Ci | Base (2.5L L6) | w/ Thermostat; |
| 2005 | BMW | 325i | Base (2.5L L6) | w/ Thermostat; |
| 2005 | BMW | 325xi | Base (2.5L L6) | w/ Thermostat; |
| 2005 | BMW | 330Ci | Base (3.0L L6) | w/ Thermostat; |
| 2005 | BMW | 330i | Base (3.0L L6) | w/ Thermostat; |
| 2005 | BMW | 330xi | Base (3.0L L6) | w/ Thermostat; |
| 2005 | BMW | 525i | Base (2.5L L6) | w/ Thermostat; |
| 2005 | BMW | 530i | Base (3.0L L6) | w/ Thermostat; |
| 2005 | BMW | X3 | 3.0i (3.0L L6) | w/ Thermostat; |
| 2005 | BMW | X5 | 3.0i (3.0L L6) | w/ Thermostat; |
| 2005 | BMW | Z4 | 2.5i (2.5L L6) | w/ Thermostat; |
| 2005 | BMW | Z4 | 3.0i (3.0L L6) | w/ Thermostat; |
| 2006 | BMW | 325Ci | Base (2.5L L6) | w/ Thermostat; |
| 2006 | BMW | 330Ci | Base (3.0L L6) | FITS: [ Submodel: Coupe; w/ Thermostat; ] OR FITS: [ Submodel: Convertible; w/ Thermostat; ] |
| 2006 | BMW | X3 | 3.0i (3.0L L6) | w/ Thermostat; |
| 2006 | BMW | X5 | 3.0i (3.0L L6) | w/ Thermostat; |
- BrandFour Seasons
- ManufacturerFour Seasons
- MPN85955
- EAN00096361859555
- Fitment Typespecific
- Part DescriptionIntegrated Thermostat Housing
- Part TypeEngine Coolant Thermostat Housing
- Interchange Part Number11530139877; 11531436823; 11531437040; 11537509227; 14602; 33934; 467185; 6052019; 815773; 85955; 902813; TM1397; W98485
- Mfr LabelThermostat Housing
- Short DescriptionThermostat Housing
Shipping Policy – DTautoparts
We ship all orders from our U.S. warehouses with USPS, UPS, or FedEx.
Processing Time
Orders placed before 3 PM EST ship the same day
Others ship next business day
Transit Time
Standard shipping: 2–5 business days
Expedited shipping: 1–3 business days (optional at checkout)
Shipping Rates
Free standard shipping on all orders
Expedited options available at checkout
Tracking
All orders include tracking information, emailed automatically once shipped.
Lost Packages
If a package is lost in transit, we will:
Start an investigation with the carrier
Resend the order or issue a full refund if confirmed lost
Incorrect Addresses
If the address is incorrect when the order ships:
Carrier may return the package
We can resend (buyer pays reship fee) or refund the order
Return Policy – DTautoparts
At DTautoparts, we want every customer to be fully satisfied with their purchase.
If an item does not fit your vehicle or you are not fully satisfied, we offer hassle-free returns.
Return Window
Returns accepted within 30 days of delivery.
Items must be returned in their original condition unless the item was defective or damaged on arrival.
Free Returns
If the part doesn’t fit, or arrives damaged, we provide a free return shipping label.
Customer-Responsibility Returns
(used, installed, incorrect item ordered, changed mind)
Buyer pays return shipping.
Item must be unused, uninstalled, and in original packaging.
Incorrect / Defective Parts
If the part is faulty, damaged, or the wrong item was sent:
We will provide a free return label
And issue a full refund OR send a replacement
Refund Time
Refunds are processed within 2–3 business days after the returned item is received and inspected.
Warranty
All parts sold by DTautoparts LLC are backed by a 1-year warranty.
What’s Covered
Manufacturing defects
Premature failure
Broken components not caused by external damage
What’s Not Covered
Normal wear and tear
Improper installation
Damage from accidents or abuse
Modified or altered parts
How to Request a Warranty Claim
Please contact us with:
Order number
Description of the issue
Photos or videos of the problem
We will:
Review the claim in 24–48 hours
Provide a replacement or refund if approved
Frequently Asked Questions
Does this part fit my vehicle?
Use the Year/Make/Model selector at the top of the page.
If unsure, contact us — we respond within minutes.
Is this part new or used?
All parts are brand-new, factory-fresh, and never used.
Does this include hardware?
If included, it will appear in the product images or description.
If not listed, assume hardware is not included.
What if the part doesn’t fit?
No problem — we offer free returns on items that do not fit your vehicle.
What warranty does this part come with?
Every part includes a 1-year warranty.
How fast do you ship?
Orders before 3 PM EST ship the same day.






