Get your heater and A/C fan speeds responding again with the Standard Ignition HVAC Blower Motor Resistor RU-888. It drops in as a direct-fit replacement for the listed applications, including the 2013-2016 Audi A4, 2012-2017 Audi A5 Quattro, 2013-2017 Audi Q5, 2013-2016 Audi S4 and the 2015-2019 Porsche Macan — see the Buyer's Guide tab for the full list.
The blower motor resistor sits in the HVAC blower circuit and drops voltage to the blower motor to set the lower and intermediate fan speeds. When it fails, the blower commonly runs only at the highest setting or stops responding at one or more speeds. If a failed resistor is the cause, this part replaces it.
- Fan-speed control: Adds resistance in the blower motor circuit to establish the lower and mid-range fan speeds.
- Signs it may need replacing: Blower works only on high, or one or more speed settings no longer respond.
- Application coverage: Built to replace the original resistor on the listed Audi and Porsche models.
Interchange: Manufacturer part number RU-888 (also RU888).
Frequently Asked Questions
What does the RU-888 do?
It's an HVAC blower motor resistor that adds resistance in the blower circuit to set the lower and intermediate fan speeds for your heater and A/C system.
My blower only runs on high — will this fix it?
If the resistor has failed, the blower often works only on high or drops certain speeds; replacing it with the RU-888 addresses that. Diagnose the circuit first, since wiring or the switch can also be at fault.
Will this fit my vehicle?
It's listed for numerous Audi models (A4, A5, Allroad, Q5, RS5, S4, S5, SQ5 and Quattro variants) and the 2015-2019 Porsche Macan. Check the Buyer's Guide tab to confirm your exact year and model.
Does it fit the Audi RS5?
Yes — it's listed for the 2011 Audi RS5 and again for the 2013-2015 Audi RS5. Confirm your model year in the Buyer's Guide tab before ordering.
What is the part number?
The manufacturer part number is RU-888 from Standard Ignition.
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