Nissens 70526 HVAC Heater Core

Nissens 70526 HVAC Heater Core for BMW

The Nissens 70526 HVAC heater core is an aluminum replacement built for BMW heating systems that need reliable cabin heat transfer and stable thermal performance. It is a direct-fit style heater core for select BMW X1, X3, X4, 128i, 135i, 328i, 335i, M3, and related applications.

• Aluminum core material for efficient heat exchange
• Aluminum tank material for consistent thermal construction
• Brazed cooling fins for durable fin-to-tube bonding
• Core dimensions: 5.8300 in. height, 10.0400 in. length, 1.0200 in. width
• Pipe included: No
• Part number: 70526

Fitment and Cross References

Compatible with BMW applications including Fits 2015-2018 BMW X4, N/A; Fits 2011-2017 BMW X3, N/A; Fits 2013-2015 BMW X1, N/A; Fits 2008-2013 BMW 128i, N/A; Fits 2008-2013 BMW 135i, N/A; Fits 2007-2013 BMW 328i, N/A; Fits 2009-2013 BMW 328i xDrive, N/A; Fits 2012-2013 BMW 335i, N/A; Fits 2013 BMW 335i xDrive, N/A; Fits 2011-2013 BMW 335is, N/A; Fits 2011-2013 BMW M3, N/A; Fits 2011 BMW 1 Series M, N/A; Fits 2009-2011 BMW 335d, N/A; Fits 2007-2011 BMW 335i, N/A; Fits 2008-2010 BMW M3, N/A; Fits 2007-2008 BMW 328xi, N/A; and Fits 2007-2008 BMW 335xi, N/A. This part cross-references BMW 9128953 and Valeo 812401 for the same application.

What This Heater Core Helps Address

• Weak or uneven cabin heat output
• Coolant odor inside the vehicle from a leaking heater core
• Fogging or film on the windshield caused by HVAC leakage
• Restricted heat transfer from a corroded or clogged core
• HVAC performance loss in BMW X3, X4, 328i, and 335i heating systems

Installation Notes and Tips

Verify the core dimensions and vehicle application before installation, especially on BMW models with vendor-specific notes such as Valeo references or sedan exclusions. Inspect the HVAC housing, coolant hoses, and seals during replacement, and confirm the system is properly bled after installation to restore heater performance.

Quality Assurance

Nissens develops thermal management components to high manufacturing standards and applies the same engineering focus across its aftermarket range. The 70526 heater core reflects that approach with aluminum construction and brazed fin design for dependable service in BMW HVAC systems.