Description
7L0907521B Heater Blower Motor Resistor is a critical HVAC component used in Audi Q7 (2006-2015), Volkswagen Touareg (2004-2017), and Porsche Cayenne (2003-2018) models.
🔧 Key Features & Compatibility
✔ OEM Part Number: 7L0907521B (replaces earlier versions like 7L0907521A)
✔ Vehicle Fitment:
Audi Q7 (4L, 2006–2015)
VW Touareg (7L, 2004–2017)
Porsche Cayenne (955/957/958, 2003–2018)
✔ Function: Controls blower fan speeds (except max speed, which runs directly)
⚠ Symptoms of a Failing Resistor
Blower fan only works on high speed (or not at all)
Inconsistent fan speeds (stops at certain settings)
Burning smell (overheating resistor)
No airflow despite HVAC settings
🔧 Installation Notes
1️⃣ Location: Typically behind the glovebox or under the dashboard
2️⃣ Disconnect the battery before replacement (safety precaution)
3️⃣ Check wiring/connector for melting/damage (common issue)
4️⃣ No coding required – plug-and-play installation
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