HomeBelts and Cooling > Hoses and PipesGates CO34945 Engine Coolant Filler Neck
Part #: CO34945

Gates CO34945 Engine Coolant Filler Neck

Coolant Outlet
5 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
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OE Direct Replacement — Bolt-on fit, no modifications needed
Coolant Outlet
Fitment: Mini, Cooper
Easy Returns — Return within 60 days for a full refund
Fast Shipping — Most orders ship same business day before 1pm CST

Overview of Gates Coolant Outlet for Mini Cooper

The Gates Coolant Outlet CO34945 is designed specifically for Mini Cooper vehicles, providing a reliable engine coolant filler neck solution. Engineered from durable plastic, this part ensures proper coolant flow and system integrity for your Mini Cooper's cooling system.

  • Constructed from high-quality plastic material for durability
  • Includes a coolant filler neck with 3 bolt holes for secure mounting
  • Features multiple outlet diameters: 1.25 inch and 0.41 inch outside diameters
  • Equipped with by-pass holes to maintain optimal coolant circulation
  • Contains one seal and no gaskets for a streamlined installation
  • Compatible with Mini Cooper models requiring this specific coolant outlet

Detailed Product Description and Attributes

The Gates Coolant Outlet CO34945 is a plastic engine coolant filler neck designed to fit Mini Cooper vehicles. It features two outlet outside diameters of 1.25 inches and 0.41 inches, and corresponding inside diameters of 1.01 inches and 0.29 inches, allowing for precise coolant flow management. The part includes three bolt holes for secure attachment and one seal to ensure a tight fit, while it does not require any gaskets. Additionally, the coolant outlet has by-pass holes with inside and outside diameters of 0.58 inches and 0.75 inches respectively, which help maintain proper coolant circulation and prevent overheating. This part is not an exact OE replacement but is engineered to meet the cooling system requirements of Mini Cooper models.

About the Gates Coolant Outlet Product Line

The Gates Coolant Outlet line focuses on providing reliable and durable components for vehicle cooling systems. This product line includes coolant filler necks designed to maintain proper coolant flow and system pressure. The CO34945 part exemplifies the Coolant Outlet line’s commitment to quality materials and precise fitment, ensuring compatibility with specific vehicle makes and models such as the Mini Cooper.

Common Applications and Issues Addressed

  • Replacement of cracked or damaged coolant filler necks in Mini Cooper vehicles
  • Resolving coolant leaks caused by worn or faulty filler necks
  • Preventing overheating due to improper coolant flow or pressure loss
  • Maintaining system pressure with the included 16 psi radiator cap and 196°F thermostat compatibility
  • Ensuring secure coolant system connections with three-bolt mounting design

Installation Notes and Tips

  • Verify compatibility with your Mini Cooper model before installation
  • Ensure all old seals and debris are removed from the mounting surface
  • Use the included seal to prevent leaks; no additional gaskets are required
  • Tighten the three bolts evenly to avoid warping or leaks
  • Check coolant levels and system pressure after installation

Quality Assurance and Warranty

The Gates Coolant Outlet CO34945 is manufactured to meet industry standards for durability and performance. While this part is not an exact OE replacement, it is engineered to provide reliable service in Mini Cooper cooling systems. Gates products typically come with a limited warranty against defects in material and workmanship; please refer to the manufacturer’s warranty details for specific coverage information.

BrandGates
Part NumberCO34945
PositionCoolant Outlet
.58
.75
1
Yes
Bolt Hole Quantity3
By-Pass HolesYes
By-Pass Inside Diameter (in).58
By-Pass Outside Diameter (in).75
ContentsCoolant Filler Neck, 16 psi Radiator Cap, 196 Deg. F Thermostat w/ Integrated Seal
ContentsCoolant Filler Neck, 16 psi Radiator Cap, 196 Deg. F Thermostat, Integrated Seal
Gasket Quantity0
MaterialPlastic
Number of Bolt Holes3
Number of Gaskets0
Number of Seals1
OE ExactNo
Outlet Inside Diameter.29
Outlet Inside Diameter1.01
Outlet Inside Diameter 1 (in)1.01
Outlet Inside Diameter 2 (in).29
Outlet Outside Diameter.41
Outlet Outside Diameter1.25
Outlet Outside Diameter 1 (in)1.25
Outlet Outside Diameter 2 (in).41
TypeCoolant Filler Neck
TypeCoolant Filler Neck

This part fits 5 vehicles. Search below:

YearMakeModelLitersCylindersFuel TypePositionNotes
2006MiniCooper1.6LL4GASN/ACoolant Fill Flange; 195 Degree/16 psi Pressure Rating; OE Temperature; Seal included; Coolant Outlet
2005MiniCooper1.6LL4GASN/ACoolant Fill Flange; 195 Degree/16 psi Pressure Rating; OE Temperature; Seal included; Coolant Outlet
2004MiniCooper1.6LL4GASN/ACoolant Fill Flange; 195 Degree/16 psi Pressure Rating; OE Temperature; Seal included; Coolant Outlet
2003MiniCooper1.6LL4GASN/ACoolant Fill Flange; 195 Degree/16 psi Pressure Rating; OE Temperature; Seal included; Coolant Outlet
2002MiniCooper1.6LL4GASN/ACoolant Fill Flange; 195 Degree/16 psi Pressure Rating; OE Temperature; Seal included; Coolant Outlet

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

11537829959115378299602113KT81577685958902-5113

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.