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
  

 

Make	Model	Variant	Type	Engine	Chassis	Year
BMW	1 Series	Petrol Hatch	125i	1997cc 160KW 218HP N20 B20 A	RWD -- F21	2011-2019
BMW	1 Series	Petrol Hatch	125i	1997cc 160KW 218HP N20 B20 A	RWD -- F20	2012-2017
BMW	1 Series	Petrol Hatch	125i	1997cc 175KW 238HP N20 B20 A	RWD -- F20	2012-2017
BMW	1 Series	Petrol Hatch	125i	1997cc 175KW 238HP N20 B20 A	RWD -- F21	2013-2019
BMW	2 Series	Petrol Convertible	220i	1997cc 135KW 184HP N20 B20 A;N20 B20 B	RWD -- F23	2014-2021
BMW	2 Series	Petrol Convertible	228i	1997cc 180KW 245HP N20 B20 A	RWD -- F23	2014-2016
BMW	2 Series	Petrol Coupe	220i	1997cc 135KW 184HP N20 B20 A;N20 B20 B	RWD -- F22,F87	2013-2021
BMW	2 Series	Petrol Coupe	228i	1997cc 180KW 245HP N20 B20 A;N26 B20 A	RWD -- F22,F87	2014-2016
BMW	3 Series	Diesel Saloon	320d	1995cc 140KW 190HP B47 D20 A	RWD -- F30,F80	2015-2018
BMW	3 Series	Petrol Estate	320i	1997cc 135KW 184HP N20 B20 B	RWD -- F31	2012-2015
BMW	3 Series	Petrol Estate	320i xDrive	1997cc 135KW 184HP N20 B20 B	AWD -- F31	2013-2015
BMW	3 Series	Petrol Estate	328i	1997cc 180KW 245HP N20 B20 A;N26 B20 A	RWD -- F31	2012-2015
BMW	3 Series	Petrol Estate	328i xDrive	1997cc 180KW 245HP N20 B20 A;N26 B20 A	AWD -- F31	2013-2016
BMW	3 Series	Petrol Hatch	320i	1997cc 135KW 184HP N20 B20 A;N20 B20 B	RWD -- F34	2013-2016
BMW	3 Series	Petrol Hatch	320i xDrive	1997cc 135KW 184HP N20 B20 A;N20 B20 B	AWD -- F34	2012-2016
BMW	3 Series	Petrol Hatch	328i	1997cc 180KW 245HP N20 B20 A;N26 B20 A	RWD -- F34	2013-2016
BMW	3 Series	Petrol Hatch	328i xDrive	1997cc 180KW 245HP N26 B20 A	AWD -- F34	2013-2016
BMW	3 Series	Petrol Saloon	320i	1598cc 125KW 170HP N13 B16 A	RWD -- F30,F80	2012-2016
BMW	3 Series	Petrol Saloon	320i	1997cc 135KW 184HP N20 B20 A;N20 B20 B;N20 B20 D	RWD -- F30,F80	2012-2018
BMW	3 Series	Petrol Saloon	320i	1998cc 135KW 184HP B48 B20 A	RWD -- F30,F80	2015-2018
BMW	3 Series	Petrol Saloon	320i xDrive	1997cc 135KW 184HP N20 B20 A;N20 B20 B	AWD -- F30,F80	2012-2018
BMW	3 Series	Petrol Saloon	328i	1997cc 180KW 245HP N20 B20 A;N26 B20 A	RWD -- F30,F80	2011-2018
BMW	3 Series	Petrol Saloon	328i xDrive	1997cc 180KW 245HP N20 B20 A;N26 B20 A	AWD -- F30,F80	2012-2016
BMW	3 Series	Petrol Saloon	330i	1998cc 185KW 252HP B46 B20 B;B48 B20 B	RWD -- F30,F80	2015-2018
BMW	3 Series	Petrol Saloon	M3	2979cc 317KW 431HP S55 B30 A	RWD -- F30,F80	2014-2018
BMW	4 Series	Petrol Convertible	420i	1997cc 135KW 184HP N20 B20 B	RWD -- F33,F83	2014-2016
BMW	4 Series	Petrol Convertible	428i	1997cc 180KW 245HP N20 B20 A;N26 B20 A	RWD -- F33,F83	2013-2017
BMW	4 Series	Petrol Convertible	428i xDrive	1997cc 180KW 245HP N20 B20 A	AWD -- F33,F83	2014-2016
BMW	4 Series	Petrol Coupe	420i	1997cc 135KW 184HP N20 B20 A;N20 B20 B	RWD -- F32,F82	2013-2017
BMW	4 Series	Petrol Coupe	420i	1997cc 135KW 184HP N20 B20 B	RWD -- F36	2014-2017
BMW	4 Series	Petrol Coupe	420i xDrive	1997cc 135KW 184HP N20 B20 A;N20 B20 B	AWD -- F32,F82	2013-2016
BMW	4 Series	Petrol Coupe	420i xDrive	1997cc 135KW 184HP N20 B20 B	AWD -- F36	2014-2016
BMW	4 Series	Petrol Coupe	428i	1997cc 180KW 245HP N20 B20 A;N26 B20 A	RWD -- F32,F82	2013-2017
BMW	4 Series	Petrol Coupe	428i	1997cc 180KW 245HP N20 B20 A;N26 B20 A	RWD -- F36	2014-2016
BMW	4 Series	Petrol Coupe	428i xDrive	1997cc 180KW 245HP N20 B20 A;N26 B20 A	AWD -- F32,F82	2013-2016
BMW	4 Series	Petrol Coupe	428i xDrive	1997cc 180KW 245HP N20 B20 A;N26 B20 A	AWD -- F36	2014-2016
BMW	5 Series	Diesel Saloon	520d	1995cc 135KW 184HP N47 D20 C	RWD -- F10	2010-2014
BMW	5 Series	Diesel Saloon	520d	1995cc 140KW 190HP B47 D20 A	RWD -- F10	2014-2016
BMW	5 Series	Diesel Saloon	525d	1995cc 160KW 218HP N47 D20 D	RWD -- F10	2011-2016
BMW	5 Series	Diesel Saloon	525d	2993cc 150KW 204HP N57 D30 A	RWD -- F10	2010-2011
BMW	5 Series	Diesel Saloon	530d	2993cc 190KW 258HP N57 D30 A	RWD -- F10	2011-2016
BMW	5 Series	Petrol Estate	520i	1997cc 120KW 163HP N20 B20 A;N20 B20 B	RWD -- F11	2011-2017
BMW	5 Series	Petrol Estate	520i	1997cc 135KW 184HP N20 B20 A;N20 B20 B	RWD -- F11	2010-2017
BMW	5 Series	Petrol Estate	528i	1997cc 180KW 245HP N20 B20 A	RWD -- F11	2011-2017
BMW	5 Series	Petrol Estate	528i xDrive	1997cc 180KW 245HP N20 B20 A	AWD -- F11	2011-2017
BMW	5 Series	Petrol Hatch	528i	1997cc 180KW 245HP N20 B20 A	RWD -- F07	2013-2017
BMW	5 Series	Petrol Saloon	520i	1997cc 120KW 163HP N20 B20 A;N20 B20 B	RWD -- F10	2011-2016
BMW	5 Series	Petrol Saloon	520i	1997cc 135KW 184HP N20 B20 A;N20 B20 B	RWD -- F10	2011-2016
BMW	5 Series	Petrol Saloon	528i	1997cc 180KW 245HP N20 B20 A	RWD -- F10	2011-2016
BMW	5 Series	Petrol Saloon	528i	2996cc 190KW 258HP N53 B30 A	RWD -- F10	2010-2011
BMW	5 Series	Petrol Saloon	528i xDrive	1997cc 180KW 245HP N20 B20 A	AWD -- F10	2011-2016
BMW	5 Series	Petrol Saloon	M5	4395cc 412KW 560HP S63 B44 B	RWD -- F10	2011-2016
BMW	X1	Petrol SUV	16i sDrive	1592cc 105KW 143HP N20 B16 A	RWD -- E84	2013-2015
BMW	X1	Petrol SUV	20i sDrive	1997cc 135KW 184HP N20 B20 A	RWD -- E84	2011-2015
BMW	X1	Petrol SUV	20i xDrive	1997cc 135KW 184HP N20 B20 A	AWD -- E84	2011-2015
BMW	X1	Petrol SUV	28i xDrive	1997cc 180KW 245HP N20 B20 A	AWD -- E84	2011-2015
BMW	X3	Petrol SUV	20i sDrive	1592cc 125KW 170HP N20 B16 A	RWD -- F25	2014-2017
BMW	X3	Petrol SUV	20i sDrive	1997cc 135KW 184HP N20 B20 A	RWD -- F25	2014-2017
BMW	X3	Petrol SUV	20i xDrive	1997cc 135KW 184HP N20 B20 A	AWD -- F25	2011-2017
BMW	X3	Petrol SUV	28i xDrive	1997cc 180KW 245HP N20 B20 A	AWD -- F25	2012-2017
BMW	X4	Petrol SUV	20i xDrive	1997cc 135KW 184HP N20 B20 A	AWD -- F26	2014-2018
BMW	X4	Petrol SUV	28i xDrive	1997cc 180KW 245HP N20 B20 A	AWD -- F26	2014-2018
BMW	X5	Petrol SUV	28i xDrive	1997cc 180KW 245HP N20 B20 A	AWD -- F15,F85	2015-2018
BMW	X5	Plug-In Hybrid SUV	40e xDrive	1997cc 230KW 313HP N20 B20 A	AWD -- F15,F85	2015-2018
BMW	Z4	Petrol Convertible	18i sDrive	1997cc 115KW 156HP N20 B20 A	RWD -- E89	2013-2016
BMW	Z4	Petrol Convertible	20i sDrive	1997cc 120KW 163HP N20 B20 A	RWD -- E89	2011-2016
BMW	Z4	Petrol Convertible	20i sDrive	1997cc 135KW 184HP N20 B20 A	RWD -- E89	2011-2016
BMW	Z4	Petrol Convertible	28i sDrive	1997cc 180KW 245HP N20 B20 A	RWD -- E89	2011-2016
Make	Model	Variant	Type	Engine	Chassis	Year

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