Heater/Blower resistor Wiring Harness - BMW 3,5 Series X3 X5

SmartSense™Resistor wiring Loom

OEM quality heater resistor/control Wiring loom/harness

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Compatibility
BMW 3 Series E36 (1991-1998)
BMW 3 Series E46 (1998-2005)
BMW 3 Series E46 M3 3.2 (2000-2006)
BMW 3 Series E46 M3 CSL (2003-2006)
BMW 5 Series E39 (1996-2004)
BMW 5 Series E39 M 4.9 (1998-2003)
BMW X3 E83 (2004-2010)
BMW X5 E53 (1999-2007)

Interchangeable Part Numbers: 
6411 6 923 204
Supersedes the following part numbers:
64 11 6 920 365
64 11 6 929 486 
64 11 8 383 835
64 11 8 385 549
64 11 8 364 173
64 11 8 377 579
64 11 6 931 680

Please compare the part number with your original part to ensure correct operation and fitment. Some vehicles may use more than one part number depending on configuration. If in doubt please email us your chassis/VIN number and we will let you know the correct part you need for your car.

Symptoms of a Blown Resistor
A faulty resistor can cause a number of problems with the heating/HVAC system of a car, including but not limited to:
- No hot air
- Heating only working intermittently
- Heating only working on some settings (when the resistor is bypassed) 

Installation
There are numerous guidelines and instructions on owner forums, the internet and on YouTube. However as this is a service part we recommend installation by a qualified professional. 

When installed it is IMPERATIVE to monitor the temperature of the resistor on first use. Sometimes a blown resistor can be a symptom of the problem and not the problem itself, and replacing it in this scenario will only cause it to blow again. If the resistor starts heating very quickly and getting too hot IMMEDIATELY SWITCH OFF YOUR CAR and diagnose the problem elsewhere. Resistors usually blow when they get too hot and this happens when too much current is being drawn from then. This can happen if there is an issue with the blower motor or even the ignition system, or a fault with the wiring loom harness. Also please check your fan is not jamming because of dirt or grease build up, or a failure in the bearings. This will also cause the fan to try to draw more power in an attempt to spin, causing the resistor to overheat and fail.

If replacing the resistor (and it is not getting hot) your heater still does not work, please check the thermo fuse or carry out further diagnosis elsewhere for a fault.

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