T: +8615609213525
E: 15829336298@139.com
E: 15829336298@139.com
Room 1212-G107, Unit 2, Building 1, Block A, Shenglong Plaza, No. 80 Weiyang Road, Weiyang District, Xi'an City, Shaanxi Province
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WG1664821019
Sinotruk HOWO
| Attribute | Description |
|---|---|
| Part Name | HVAC Blower Motor Speed Control Module / Heater Fan Speed Regulator |
| Common Names | Blower Motor Resistor, Fan Speed Controller, Cabin Climate Control Module (Fan Section), HVAC Power Module |
| OE Number (Original Equipment) | WG1664821019 |
| Manufacturer | Supplied by Sinotruk (CNHTC) and affiliated component manufacturers based in Jinan, China |
| Function | Controls the voltage supplied to the HVAC blower motor, enabling variable fan speeds (Low, Medium, High) for driver comfort inside the cab |
| Control Method | Electronically regulates current via built-in power transistors or resistor network (typically MOSFET-based PWM or stepped resistance design) |
| Mounting Location | Installed inside the HVAC duct assembly near the blower motor, typically behind the dashboard on the passenger side |
| Interface Type | Plug-and-play waterproof connector (multi-pin, sealed) |
| Compatibility | Designed for integration with 24V DC electrical systems in modern electronically controlled climate systems |
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⚠️ WARNING: Disconnect battery before servicing any electrical component near the HVAC system.
Park on level ground, turn off ignition.
Disconnect negative terminal of 24V battery.
Allow time for capacitors to discharge (~2 minutes).
Locate the module inside the HVAC housing behind the glove box or lower dash panel.
Remove interior trim panels carefully (use plastic pry tools).
Take note of wiring routing and mounting position.
Unplug the main sealed connector from the back of the module.
Inspect for signs of melting, discoloration, or corrosion — these indicate poor contact or overload.
Unscrew 2–3 mounting screws (M4/M5).
Gently pull out the unit — avoid damaging the terminals or heat sink.
Insert new unit into place.
Secure with original screws — do not overtighten.
Ensure good contact between the module base and any grounding/mounting surface.
Reattach the waterproof connector firmly until it clicks.
Reinstall all trim parts.
Reconnect battery.
Turn HVAC system ON and test all fan speeds:
OFF → Low → Medium → High
Confirm smooth transitions and no error lights on dash.
