Genuine OEM 64128374995 - HVAC Heater Control Valve

Product Overview

This Genuine OEM 64128374995 HVAC heater control valve regulates coolant flow through the heater core to maintain cabin temperature in BMW 5 Series, 7 Series, M5, M6, and X5 models from 1997 to 2009. The valve is a critical component of the climate control system, responding to thermostat commands to deliver precise heating performance. As an OEM part, it meets BMW factory specifications and is backed by dealership warranty coverage.

Symptoms of a Failing HVAC Heater Control Valve

• No heat or insufficient heat output from cabin vents even after engine reaches operating temperature
• Heater produces only cold or lukewarm air regardless of temperature dial position
• Inconsistent cabin temperature; heat works intermittently or cuts out unexpectedly
• Coolant leaking from the heater valve area or onto the cabin floor
• Engine running hot while cabin remains cold, indicating coolant is bypassing the heater core
• Fogged or steamed windshield due to inability to warm and defrost effectively

Cross Reference Numbers

This Genuine OEM 64128374995 is equivalent to or replaces the following part numbers: 64-12-8-374-995, 64128374995.

Vehicle Compatibility

This part fits the popular models below. For Fitment Confidence, please use the vehicle selector tool above to verify exact compatibility for your vehicle.

• BMW 528i (E39): 1997–2000
• BMW 540i (E39): 1997–2003
• BMW M5 (E39): 2000–2003
• BMW 525i (E39): 2001–2003
• BMW 530i (E39): 2001–2003
• BMW X5 (E53): 2003, 2005–2006
• BMW 750i and 750Li (E65): 2007–2009
• BMW M6 Coupe and Convertible (E63, E64): 2007–2009
• BMW Alpina B7 (E65): 2008

This may also fit other applications. Please use the vehicle selector tool to verify fitment.

Why Shop at eEuroparts.com?

• Proven Expertise: Over 25 years of experience with European vehicles means we know your car inside and out.
• Fitment Confidence: Our accurate cataloging ensures you get the right part the first time, backed by our fitment guarantee.
• Fast, Reliable Shipping: Most in-stock orders ship the same or next business day from our U.S.-based warehouse.
• Transparent Pricing: Competitive prices with no hidden fees or surprise charges.
• Exclusive Kits That Fit™: Complete repair solutions with no guesswork.
• Established Trust: Serving the European car community since 2000.

Frequently Asked Questions

How do I know if my BMW E39 5 Series or E65 7 Series heater control valve needs replacement?

The most common sign is a complete loss of heat output from the cabin vents, even after the engine has warmed up. You may also notice coolant leaking near the firewall or under the dash, or experience intermittent heating that comes and goes. If your temperature gauge shows the engine is hot but your cabin remains cold, the heater valve is a prime suspect. A professional diagnostic can confirm whether the valve is stuck closed or leaking internally.

Can I replace the heater control valve myself, or do I need a technician?

Heater valve replacement typically requires access to the heater core plumbing, which on many BMW models is located behind or near the dashboard. The job involves disconnecting coolant hoses, removing fasteners, and potentially draining some coolant. While experienced DIY technicians can handle this repair, it often requires removing trim panels and careful hose routing. If you are unfamiliar with coolant system work or your vehicle's specific layout, professional installation is recommended to avoid coolant leaks or air pockets in the system.

What tools and supplies will I need for heater valve replacement?

You will need a floor jack and jack stands (if accessing from below), a socket set and wrenches, screwdrivers, a drain pan for coolant, fresh coolant to refill the system, and potentially a trim removal tool. Consult your service manual for the specific socket and wrench sizes required for your model. You may also need a coolant funnel and a way to bleed air from the cooling system after installation.

Should I flush my cooling system when I replace the heater control valve?

While not always mandatory, flushing the cooling system during heater valve replacement is a good maintenance practice. Over time, coolant can accumulate sediment and debris that may contribute to valve sticking or premature wear. If you are already draining the system to replace the valve, a flush is a logical step. Refer to your BMW service manual for the recommended coolant type and flush procedure to ensure proper system conditioning.

Will replacing the heater valve improve my cabin heating performance?

If the valve is stuck or leaking, replacement will restore normal heat output. A properly functioning heater control valve allows the thermostat to modulate coolant flow and maintain the temperature you select. If your heating system was previously weak or non-functional, a new valve should bring cabin warmth back to factory specification. If you replace the valve and heating remains poor, the issue may lie elsewhere in the climate control system, such as a blocked heater core or a faulty thermostat.

Is this Genuine OEM part better than an aftermarket alternative?

Genuine OEM parts are engineered to BMW specifications and carry the factory warranty when installed by a dealership. This heater control valve is a precision component that regulates coolant flow at exact pressures and response rates. Aftermarket valves may work, but OEM parts ensure the best fit, durability, and performance. For a climate control system where precision matters, choosing Genuine OEM is a sound investment in long-term reliability.

Order Genuine OEM 64128374995 today. In-stock orders ship same or next business day from our U.S. warehouse, and our fitment team is one call away if you need help confirming the right part for your BMW.

Note: All information on this page and in the FAQ is for general reference only. Verify fitment and consult a professional as needed. eEuroparts.com is not responsible for incorrect part selection or installation.