Take back precise, multi-speed control of your cabin airflow with the Standard Ignition HVAC Blower Motor Resistor RU-740. It installs as a direct-fit replacement for the front HVAC system on the 2018-2019 INFINITI Q70 (All), 2015-2019 INFINITI Q70L (All), and 2007-2015 MAZDA CX-9 (All).
The blower motor resistor sits in the front heating and air-conditioning circuit and manages the electrical current sent to the blower motor, stepping the fan through its lower and mid-range speed settings while the control switch calls for them.
- Fan-speed control: Provides the resistance the blower motor needs to run at speeds below high.
- Front HVAC application: Serves the front blower circuit on the listed vehicles.
- Direct-fit: Designed to install for the listed applications without modification.
Common signs the resistor may need replacing include a blower that works only on the highest setting, one or more mid-range speeds dropping out, or no airflow on certain settings. Because those symptoms can have other causes, diagnose the circuit first; if a failed resistor is the cause, this RU-740 replaces it.
Manufacturer part number: RU-740 (also RU740).
Frequently Asked Questions
What does the RU-740 blower motor resistor do?
It manages the current sent to the front HVAC blower motor, allowing the fan to run at its lower and mid-range speeds when the control switch calls for them.
Which vehicles does the RU-740 fit?
It is a direct-fit replacement for the 2018-2019 INFINITI Q70 (All), 2015-2019 INFINITI Q70L (All), and 2007-2015 MAZDA CX-9 (All). Confirm your vehicle in the Buyer's Guide tab.
Why does my blower only work on high?
A blower that runs only on high while lower speeds are dead is a common sign of a failed resistor. Diagnose the circuit first; if the resistor is the cause, this part replaces it.
Is this for the front HVAC system?
Yes. This resistor serves the front heating and air-conditioning blower circuit on the listed applications.
What is the manufacturer part number?
The Standard Ignition manufacturer part number is RU-740.
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