Product Introduction

• Structure: An electronic control unit housed in a heat-dissipating aluminum alloy casing with an integrated heatsink. It features a plug-and-play electrical connector and mounting brackets for secure installation.

• Performance: Uses pulse-width modulation (PWM) to adjust blower motor speed smoothly, providing precise control over cabin airflow. The heatsink design efficiently dissipates heat, ensuring reliable performance even under prolonged high-load operation.

Core Function

1. Speed Regulation: Adjusts blower motor speed in response to signals from the AC control panel, providing variable airflow for heating and cooling.

2. PWM Control: Delivers smooth, stepless speed changes without mechanical relays, improving efficiency and reducing noise.

3. Heat Dissipation: The integrated aluminum heatsink prevents overheating, extending the module’s service life.

4. Overload Protection: Built-in safeguards protect the module and blower motor from electrical damage.

AC Speed Module WG1664821019 Sinotruk Sitrak – Factory Direct Supply

When your Sitrak truck’s HVAC system loses precise fan speed control, downtime and driver discomfort follow quickly. The AC Speed Module WG1664821019 is the genuine-spec blower motor resistor module engineered exclusively for Sinotruk Sitrak heavy-duty trucks. At Mettlead, we supply this critical cab comfort component at factory-direct pricing, so you can keep your fleet running efficiently without overpaying for parts.

Whether you manage a fleet of long-haul Sitrak C7H tractors or maintain Sitrak G7 construction trucks, this AC speed module ensures smooth, stepless fan speed regulation inside the cab. As a result, drivers enjoy consistent climate control across every season and every route.

Key Features and Benefits of the AC Speed Module WG1664821019

This isn’t just a simple resistor pack — the AC Speed Module WG1664821019 Sinotruk Sitrak is a precision-engineered electronic controller that manages blower motor voltage output. Here’s why fleet managers and workshop technicians trust it:

• OE-Matching Performance – Manufactured to meet Sinotruk’s original equipment specifications, guaranteeing seamless plug-and-play installation with no wiring modifications.
• Robust Thermal Protection – Built-in overheat safeguard prevents module burnout even during continuous high-speed blower operation in extreme ambient temperatures.
• Multi-Speed Output Control – Provides stable voltage regulation across all fan speed settings, eliminating erratic blower behavior or sudden shutoffs.
• Corrosion-Resistant Housing – The outer casing resists moisture and road salt ingress, which extends service life in humid or tropical operating environments.
• Direct Cost Savings – Factory-direct pricing from Mettlead eliminates distributor markups, reducing your per-unit procurement cost significantly.

In other words, this module restores full HVAC functionality while protecting your maintenance budget. Additionally, its durable design means fewer repeat replacements over the truck’s service life.

Technical Specifications

Accurate specifications matter when you’re sourcing replacement parts across borders. Below you’ll find the verified parameters for the AC Speed Module WG1664821019:

Application: Which Sitrak Truck Models Use WG1664821019?

The AC Speed Module WG1664821019 is designed for the Sinotruk Sitrak platform. More specifically, it fits the following common model series:

• Sitrak C7H – Long-haul tractor units used in intercity freight and logistics corridors across Africa, Southeast Asia, and the Middle East.
• Sitrak G7 – Construction-oriented dump trucks and mixer trucks operating in high-temperature quarry and urban job-site environments.
• Sitrak C5H – Medium-to-heavy-duty distribution trucks requiring reliable cab comfort for regional delivery routes.

If your fleet includes any of these models and drivers are reporting inconsistent blower speeds, a failed fan motor, or no airflow at certain speed settings, the WG1664821019 AC speed module is very likely the component that needs replacement. For a complete overview of compatible Sitrak components, visit our Sitrak Heavy-Duty Parts catalog.

OEM and ODM Capability

Mettlead doesn’t just sell parts — we partner with distributors, workshops, and fleet operators who need flexible sourcing solutions. Here’s what we offer beyond the standard product:

• White-Label Packaging – We ship the AC Speed Module WG1664821019 in neutral boxes or with your own brand label, so you maintain brand consistency in your local market.
• Custom Packaging – Need specific carton sizes, multilingual labels, or unique barcoding? Our packaging team accommodates custom requests.
• Strict Quality Control – Every unit undergoes electrical function testing and connector fitment verification before leaving our warehouse. Consequently, you receive only modules that are ready to install.
• Bulk Order Flexibility – Whether you need 10 units or 10,000, we scale production and shipping to match your demand cycle.
• Factory Visit Welcome – We invite buyers to visit our facilities in China and inspect quality processes firsthand.

Furthermore, if you deal in broader truck cab electrical and climate components, we can bundle this module alongside switches, blower motors, and wiring harnesses for consolidated shipments.

Customer Case Study: Fleet Overhaul in East Africa

In early 2024, a Kenyan logistics company managing 120 Sitrak C7H tractors contacted Mettlead with an urgent problem. Nearly 30% of their fleet was experiencing blower motor failures traced back to degraded AC speed modules. Drivers were refusing long-haul routes during the hot season because cab temperatures became unbearable.

After verifying the OEM part number, our team shipped 45 units of the AC Speed Module WG1664821019 Sinotruk Sitrak within 7 working days. The client’s workshop installed them over a single weekend, and within the following week, all affected trucks were back on route with full HVAC functionality restored.

The procurement manager later reported a 40% cost saving compared to sourcing the same module through a regional distributor. Moreover, the white-label packaging allowed them to maintain inventory records under their own internal part numbering system. Today, they reorder quarterly through Mettlead to maintain buffer stock — a simple strategy that has virtually eliminated HVAC-related downtime across their fleet.

Want similar results for your operation? Contact us to discuss volume pricing and lead times.

Frequently Asked Questions

What does the AC Speed Module WG1664821019 actually do?

This module regulates the voltage supplied to the cabin blower motor. In simple terms, it controls how fast or slow the fan spins when you adjust the HVAC speed dial. Without a functioning speed module, the blower may only work on one speed — or stop entirely.

How do I know if my WG1664821019 AC speed module has failed?

Common symptoms include the blower fan only running on maximum speed, no fan operation on lower settings, intermittent airflow that cuts in and out, or a complete loss of blower function. If you observe any of these in a Sitrak cab, the speed module is the most probable culprit.

Is this AC speed module an exact OE replacement?

Yes. The module is manufactured to match the original Sinotruk Sitrak specifications for part number WG1664821019. Connector pinout, mounting dimensions, and electrical output all align with the factory-installed unit, so no modifications are needed during installation.

Can I install the WG1664821019 module without specialized tools?

Generally, yes. The module is located behind the dashboard near the blower motor housing. Installation typically involves removing a panel cover, disconnecting the old module’s plug connector, and inserting the new one. A basic screwdriver and trim removal tool are usually sufficient. However, we recommend referring to the Sitrak service manual for your specific model year.

What is the expected lifespan of this AC speed module?

Under normal operating conditions, the module lasts between 3 to 5 years. Lifespan depends on usage intensity, ambient temperatures, and whether the blower motor draws normal current. A worn-out blower motor drawing excessive current can shorten module life, so we recommend inspecting the motor at the same time.

Do you offer a warranty on the AC Speed Module WG1664821019?

Yes. Mettlead provides a quality guarantee on this module. If a unit arrives defective or fails prematurely under normal use, we arrange a replacement. For specific warranty terms, please contact our team directly.

Can I order this module together with other Sitrak cab parts?

Absolutely. We supply a comprehensive range of Sitrak cab components — from blower motors and switches to complete wiring harness sets. Bundling parts in a single shipment reduces your freight cost per unit. Browse our full Sinotruk Sitrak truck parts category guide to find everything you need in one place.

Ready to Secure Your Supply? Request a Quote Today

Stop losing time to HVAC failures and overpriced replacement parts. The AC Speed Module WG1664821019 Sinotruk Sitrak is in stock and ready to ship from our China warehouse — with factory-direct pricing, flexible payment methods, and fast international delivery.

Whether you need a sample unit for testing or bulk quantities for ongoing fleet maintenance, Mettlead makes procurement simple and reliable.

Contact Us Now — Tell us your required quantity, delivery destination, and preferred packaging. Our sales team typically responds within 12 hours with a detailed quotation.