Thermostat Housing for BMW: 1 Series, 2 Series, 3 Series, 4 Series, 5 Series, X1, X3, X4, X5, Z4,

Professional-Grade Thermostat Housing for BMW N20/N26 Turbo Engines

Protect your BMW's turbocharged engine with our premium Thermostat Housing Assembly, specifically engineered for N20, N26, B46, and B48 engines. This critical cooling system component ensures optimal engine temperature regulation, preventing costly overheating damage while maintaining peak performance across BMW's most popular model range.

Key Product Benefits & Features

🏎️ BMW Model Compatibility (2011-2019)

• 1 Series: F20 (125i), F21 (125i) - 218HP & 238HP variants
• 2 Series: F22/F87 Coupe, F23 Convertible (220i, 228i)
• 3 Series: F30 Sedan, F31 Touring, F34 GT (320i, 328i, 330i, M3)
• 4 Series: F32 Coupe, F33 Convertible, F36 Gran Coupe (420i, 428i)
• 5 Series: F10 Sedan, F11 Touring, F07 GT (520i, 528i, M5)
• X1: F48 & E84 (16i, 20i, 28i xDrive)
• X3: F25 (20i, 28i xDrive)
• X4: F26 (20i, 28i xDrive)
• X5: F15/F85 (28i xDrive, 40e Hybrid)
• Z4: E89 (18i, 20i, 28i sDrive)

⚡ Technical Specifications

• Primary OEM Numbers: 11538635689, 11538648791, 11537633477, 11537633476
• Alternative Part Numbers: 34788, 822-226, TM25108, 11538636594, 11538636595
• Opening Temperature: 108°C (226°F) - Optimal for turbo engines
• Material: High-grade plastic housing with integrated sensors
• Mounting Configuration: 3-point secure mounting system

🛡️ Engine Protection Features

• Temperature Regulation: Maintains optimal 108°C operating temperature
• Turbo Engine Specific: Designed for high-performance N20/N26 applications
• Integrated Sensors: Built-in temperature monitoring for ECU feedback
• Leak Prevention: Advanced seal design prevents coolant loss
• Overheating Protection: Prevents catastrophic engine damage

BMW Engine Compatibility Matrix

N20 2.0L Turbo Engine Applications

Power Variants:

• 163HP (120kW): 520i variants
• 184HP (135kW): 320i, 420i, X1 20i, X3 20i standard power
• 245HP (180kW): 328i, 428i, 528i, X1 28i, X3/X4 28i high-performance variants

Engine Codes Supported:

• N20B20A: Primary 2.0L turbo variant
• N20B20B: Updated version with improved internals
• N20B20D: Specific regional variant
• N26B20A: SULEV compliant version for certain markets

Additional Engine Support

• N20B16A: 1.6L variant (X1 16i, X3 20i entry models)
• B46B20B: Next-generation 2.0L turbo (330i applications)
• B48B20A/B: Latest 2.0L turbo evolution (320i, newer variants)

Common Problems This Part Solves

BMW N20 Engine Cooling Issues

The BMW N20 engine is known for several reliability concerns including cooling system problems, making thermostat housing replacement crucial for long-term engine health.

Symptoms of Faulty Thermostat Housing

• ❌ Engine Overheating: Oil temperatures exceeding 250°F during city driving
• ❌ Coolant Loss: Visible leaks around thermostat area
• ❌ Temperature Fluctuations: Erratic gauge readings or slow warm-up
• ❌ Check Engine Light: Temperature sensor fault codes
• ❌ Poor Fuel Economy: Engine running too cold or too hot
• ❌ Reduced Performance: Turbo efficiency affected by improper temperatures

Benefits of Replacement

• ✅ Optimal Temperature Control: Maintains precise 108°C operating range
• ✅ Turbo Protection: Proper cooling for high-performance applications
• ✅ Fuel Efficiency: Engine reaches ideal temperature quickly
• ✅ Sensor Integration: Accurate temperature feedback to ECU
• ✅ Coolant System Integrity: Prevents leaks and coolant loss
• ✅ Long-Term Reliability: Prevents expensive engine damage

Installation Guide & Technical Information

Pre-Installation Requirements

1. Coolant Drain: Properly drain cooling system
2. Engine Cool: Allow engine to cool completely before work
3. Tools Required: Basic automotive tools plus BMW-specific fasteners
4. New Coolant: BMW-approved coolant for refill (typically 7-8 liters)

Installation Process

1. Access: Remove engine covers and air intake components
2. Drain System: Open radiator drain and remove expansion tank cap
3. Disconnect: Unplug electrical connectors from temperature sensors
4. Remove Housing: Unbolt thermostat housing (3 mounting bolts)
5. Clean Surfaces: Remove old gasket material from mating surfaces
6. Install New Unit: Apply gasket sealant if required, torque to specification
7. Refill & Bleed: Proper BMW coolant bleeding procedure essential

Professional Installation Recommended

• BMW Service Centers: Authorized dealer network
• Independent BMW Specialists: Certified technicians
• Installation Time: Typically 2-3 hours including bleeding

Quality Assurance & Testing

Manufacturing Standards

• 🏆 OEM-Grade Materials: Identical specifications to original BMW parts
• 🏆 Temperature Testing: Validated opening temperature accuracy
• 🏆 Pressure Testing: Leak-proof performance verification
• 🏆 Electrical Testing: Sensor accuracy and resistance values
• 🏆 Durability Testing: Extended life cycle validation
  

Our SKU : TB11538635689_94

All our Thermostat Housing are OEM quality and reliable after market car parts. This Thermostat Housing is specifically compatible with BMW: 1 Series, 2 Series, 3 Series, 4 Series, 5 Series, X1, X3, X4, X5, Z4, .

Please use our make-model-year tool to check this part's compatibility with your vehicle. However, please note that our tool is for reference only and we recommend that you check the part number on your old unit prior to purchasing.

If you are still not sure about the compatibility of this part to your vehicle, please supply us with the VIN number or Reg number in our live chat or contact form! You can also find details on our purchasing & shipping guide here.

Frequently Asked Questions

Q: Is this compatible with BMW xDrive (AWD) models?
A: Yes, this thermostat housing fits both RWD and AWD variants of compatible BMW models.

Q: Does this include the integrated temperature sensors?
A: Yes, this is a complete assembly including housing, thermostat, and integrated temperature sensors.

Q: How do I know if my thermostat housing needs replacement?
A: Common symptoms include overheating, coolant leaks near the thermostat, temperature gauge fluctuations, or fault codes P0128/P0597/P0598.

Q: Can this cause engine damage if it fails?
A: Yes, a failed thermostat housing can cause severe overheating, potentially damaging pistons, head gasket, and other expensive engine components.

Q: Will this affect my BMW warranty?
A: Using OEM-equivalent parts typically maintains warranty coverage, but confirm with your BMW service center.

Order Today for Immediate BMW Engine Protection

🚚 Free UK Shipping | 🛡️ 10-Year Warranty | 💬 Expert Support | 🔄 180-Day Returns

Part Numbers: 11538635689, 11538648791, 11537633477, 11537633476, 34788, 822-226, TM25108, 11538636594, 11538636595