Product Introduction

• Structure: A precision-engineered thermal expansion valve made from high-grade aluminum alloy. It features a needle-type metering orifice, pressure-sensing ports, and a sealed diaphragm to regulate refrigerant flow accurately.

• Performance: Controls the flow of high-pressure liquid refrigerant into the evaporator core, reducing its pressure and temperature to enable efficient heat exchange and cabin cooling. It dynamically adjusts flow based on evaporator outlet temperature, ensuring optimal system performance and preventing freeze-up.

Core Function

1. Refrigerant Metering: Precisely controls the flow of liquid refrigerant into the evaporator.

2. Pressure Reduction: Converts high-pressure liquid refrigerant into low-pressure vapor for efficient cooling.

3. Temperature Regulation: Dynamically adjusts flow based on evaporator temperature to prevent freeze-up and ensure consistent cooling.

4. System Efficiency: Optimizes refrigerant flow to maintain peak AC performance and fuel efficiency.

AC Expansion Valve 812W61942-0048 for Sinotruk Sitrak – Factory Direct Supply

When your Sinotruk Sitrak truck’s air conditioning system loses cooling efficiency, the culprit is often a failing expansion valve. The AC Expansion Valve 812W61942-0048 is the precision-engineered component that regulates refrigerant flow into the evaporator, ensuring consistent cabin temperature even under the harshest operating conditions. At Mettlead, we supply this genuine-spec replacement part directly from our factory in China, which means you get OEM-matching quality at a significantly lower cost — without the long wait times.

Whether you’re managing a fleet of Sitrak C7H long-haul tractors or sourcing parts for aftermarket distribution, this expansion valve delivers reliable thermal regulation that keeps drivers comfortable and HVAC systems running at peak performance. As a result, you reduce downtime and extend the service life of the entire AC system.

Key Features and Benefits of the 812W61942-0048 AC Expansion Valve

This isn’t just another replacement part sitting on a shelf. Every AC Expansion Valve 812W61942-0048 we ship from Mettlead undergoes strict quality control to match Sinotruk’s original equipment specifications. Here’s what that means for your operations:

• Precision Refrigerant Metering: The valve accurately controls refrigerant flow into the evaporator, maintaining optimal superheat levels. Consequently, the AC system cools efficiently without freezing up or underperforming.
• OEM-Grade Construction: Manufactured with brass body and stainless steel internal components, this valve resists corrosion from refrigerant exposure over thousands of operating hours.
• Direct Fitment: Engineered as a drop-in replacement for the original 812W61942-0048 part number, so installation is straightforward with no modifications required.
• Extended Service Life: Thanks to high-quality sealing materials and tight machining tolerances, this expansion valve maintains consistent performance across temperature extremes from -30°C to +80°C ambient conditions.
• Cost-Effective Maintenance: Because we supply factory-direct, you avoid the inflated pricing of multi-tier distribution chains. In other words, you get the same reliability at a fraction of the dealer cost.

Furthermore, a properly functioning expansion valve protects downstream components like the compressor and evaporator from damage caused by liquid slugging or insufficient lubrication — saving you from far more expensive repairs down the road.

Technical Specifications

Below you’ll find the complete technical parameters for the AC Expansion Valve 812W61942-0048 Sinotruk Sitrak. These specs are verified against OEM documentation to ensure full compatibility:

Application: Which Vehicles Use the 812W61942-0048 Expansion Valve?

The AC Expansion Valve 812W61942-0048 is specifically designed for the Sinotruk Sitrak heavy-duty truck platform. More specifically, it fits the following vehicle models and scenarios:

• Sitrak C7H Series: Long-haul tractor units where drivers spend extended periods in the cab, making reliable air conditioning essential for comfort and safety.
• Sitrak C5H Series: Medium-to-long-distance logistics trucks operating across varying climate zones, from tropical heat to continental extremes.
• Sitrak G7 Series: Heavy-duty construction and mining transport vehicles that work in dusty, high-temperature environments where AC performance directly impacts driver productivity.

In each of these applications, the expansion valve sits at the heart of the HVAC system — positioned between the condenser and evaporator within the truck cab system. When it fails, drivers notice immediately: warm air from the vents, inconsistent temperatures, or complete AC failure. That’s why fleet managers and workshop operators keep this part in stock as a maintenance essential.

OEM/ODM Capability and Custom Packaging

At Mettlead, we understand that different markets have different requirements. That’s precisely why we offer flexible options beyond standard supply:

• White-Label Packaging: Need to sell under your own brand? We provide neutral or custom-branded packaging with your logo, part numbers, and labeling specifications.
• Bulk Order Pricing: As a factory-direct supplier, we offer tiered pricing structures for volume purchases. The more you order, the more competitive your landed cost becomes.
• Custom Kitting: If you frequently order the expansion valve alongside O-rings, seals, or other AC components, we can bundle them into maintenance kits for easier inventory management.
• Quality Documentation: Every batch ships with inspection reports and material certificates, giving you the documentation you need for your own quality assurance processes.

In addition to the 812W61942-0048, our catalog covers thousands of genuine-spec parts for Sinotruk Sitrak vehicles. You can explore our full range on the Sitrak heavy-duty parts brand page, or browse our Sinotruk Sitrak truck parts full category guide to find exactly what you need.

Customer Case: Fleet AC Overhaul in Southeast Asia

Earlier this year, a logistics company operating 45 Sitrak C7H tractors across Thailand and Vietnam reached out to us with a recurring problem. Nearly a third of their fleet was experiencing AC failures during peak summer months, and sourcing the AC Expansion Valve 812W61942-0048 locally was both expensive and unreliable — with inconsistent quality from different suppliers.

After connecting with our sales team, they placed an initial order of 50 units of the 812W61942-0048 expansion valve along with matching O-ring seal kits. We shipped the entire order within 5 working days, and thanks to our strict quality control process, every single valve passed their incoming inspection without issue.

The result? Within two weeks of receiving the parts, their maintenance team had restored AC performance across the affected vehicles. Moreover, the cost savings compared to their previous supplier came in at over 35%. They’ve since become a repeat customer, now sourcing expansion valves, compressors, and condenser assemblies directly from Mettlead on a quarterly schedule.

This is exactly the kind of partnership we build — reliable parts, honest pricing, and delivery you can plan around.

Frequently Asked Questions About the 812W61942-0048 AC Expansion Valve

What are the symptoms of a failing 812W61942-0048 expansion valve?

When this expansion valve begins to fail, you’ll typically notice warm or inconsistent airflow from the cab vents, frost buildup on the evaporator, or the AC compressor cycling on and off rapidly. In some cases, the valve may stick open, flooding the evaporator with liquid refrigerant — which can ultimately damage the compressor if left unaddressed.

Is this expansion valve compatible with R134a refrigerant systems only?

Yes, the AC Expansion Valve 812W61942-0048 is calibrated specifically for R134a systems, which is the standard refrigerant used in Sinotruk Sitrak truck HVAC platforms. Using it with other refrigerant types is not recommended, as the superheat calibration would be incorrect.

How do I verify that 812W61942-0048 is the correct part number for my vehicle?

The most reliable method is to check the part number stamped on your existing expansion valve or cross-reference it with your vehicle’s VIN through Sinotruk’s parts catalog. Alternatively, you can send us your vehicle model and VIN, and our technical team will confirm compatibility before you place your order.

Does the expansion valve come with new O-rings and seals?

The standard package includes the expansion valve unit itself. However, we strongly recommend replacing the O-ring seals during installation to prevent refrigerant leaks. We can supply matching seal kits separately or bundled with your valve order — just let us know when you inquire.

What is the expected lifespan of this AC expansion valve under normal conditions?

Under standard operating conditions, the 812W61942-0048 expansion valve typically lasts 3 to 5 years or approximately 200,000 to 300,000 km. However, lifespan depends heavily on system maintenance — dirty refrigerant, moisture contamination, or clogged receiver-driers can shorten valve life significantly.

Can I order a small sample quantity before committing to a bulk purchase?

Absolutely. We encourage new customers to order sample units first to verify fitment and quality in their own workshop environment. Once you’re satisfied, we’ll work with you on volume pricing for larger orders.

Ready to Source Your AC Expansion Valve 812W61942-0048?

Stop overpaying for parts that take weeks to arrive. At Mettlead, we deliver the AC Expansion Valve 812W61942-0048 for Sinotruk Sitrak trucks directly from our factory — with strict quality assurance, competitive pricing, and shipping timelines that actually work for your maintenance schedule.

Whether you need 1 piece for an urgent repair or 500 units for quarterly fleet maintenance, our team is ready to provide a quotation tailored to your specific requirements.

Contact us today to request pricing, confirm part compatibility, or discuss custom packaging for your market. Let’s keep your fleet running cool.