Forged Brass Auto AC TXV Expansion Valve OEM 3M5H-19D649-AA Ford Focus Escape Mazda 3 5 R134a Block Replacement

The Silk TXV-3M5H-DB is a precision-manufactured forged brass block type thermal expansion valve engineered for direct-fit replacement in Ford, Mazda, and Mercury vehicle air conditioning systems. Designed as a drop-in substitute for OEM part number 3M5H-19D649-AA and its cross-references, this TXV delivers accurate R134a refrigerant metering and stable evaporator superheat control that meets or exceeds factory performance specifications. The forged brass body provides exceptional structural integrity under the high-pressure cycling conditions typical of modern automotive AC systems, while the 304 stainless steel diaphragm and pushrod assembly ensure consistent, chatter-free valve modulation across thousands of thermal cycles. Manufactured under ISO 9001:2015 and IATF 16949 certified quality management protocols, every TXV-3M5H-DB undergoes individual flow-rate calibration and multi-point testing before packaging, giving distributors and professional technicians confidence in consistent, repeatable performance for every unit they install.

• Forged Brass Body Excellence: Machined from high-density forged brass (CuZn39Pb3) rather than cast aluminum, the valve body delivers superior resistance to vibration-induced fatigue cracking, galvanic corrosion, and thermal expansion stress that commonly compromises lower-grade aftermarket TXVs in demanding engine compartment environments.
• Exact OEM Cross-Reference Fitment: Engineered to precisely match the mounting geometry, port sizing, and calibration of Ford OEM part 3M5H-19D649-AA, as well as service replacements 3M5Z-19849-AA and Mazda OE number BP4K-61-J15, ensuring true plug-and-play installation without shims, adapters, or field adjustments.
• Laser-Calibrated Orifice Plate: The internal metering orifice is laser-drilled and individually flow-bench calibrated for R134a refrigerant with a nominal 1.5 ton (5.3 kW) capacity rating, achieving superheat control accuracy within ±1°C under standardized SAE J2767 test protocols for consistent cabin cooling performance.
• Multi-Platform Vehicle Coverage: One SKU covers Ford Focus (2000-2011), Ford Escape (2001-2012), Ford Fusion (2006-2012), Mazda 3 (2004-2013), Mazda 5 (2006-2015), Mazda 6 (2003-2013), and Mercury Milan (2006-2011), dramatically reducing inventory complexity for multi-brand distributors and repair facilities.
• Stainless Steel Diaphragm Durability: The 304-grade stainless steel sensing diaphragm and pushrod mechanism maintain consistent actuation response from -40°C to +120°C without the elastic memory degradation or chemical attack susceptibility that plagues lower-cost beryllium-copper diaphragm alternatives over extended service life.
• HNBR O-Ring Sealing System: Factory-installed hydrogenated nitrile butadiene rubber O-rings on all four port interfaces provide superior chemical compatibility with PAG and POE synthetic compressor oils, resisting the swelling, hardening, and compression set that leads to refrigerant leaks in standard NBR O-ring assemblies.
• Individual Unit Traceability: Each TXV carries a unique serial number linked to its specific production batch, calibration data, and test results, enabling complete forward and backward traceability from raw material certification through to final shipment documentation.

The TXV-3M5H-DB block type expansion valve is engineered for direct-fit installation on a broad range of Ford Motor Company and Mazda vehicle platforms equipped with R134a air conditioning systems and Denso or Visteon HVAC architectures. Primary Ford applications include Focus (C170 platform, model years 2000 through 2011 with 2.0L Zetec and 2.0L/2.3L Duratec engine configurations), Escape (BA/B7 platform, 2001 through 2012 covering both 2.0L Zetec and 3.0L Duratec V6 variants), and Fusion (CD338 platform, 2006 through 2012 with 2.3L and 2.5L Duratec engines). Mazda applications cover Mazda 3 (BK/BL platform, 2004 through 2013), Mazda 5 (CR/CW platform, 2006 through 2015), and Mazda 6 (GG/GH platform, 2003 through 2013). The Mercury Milan (CD338 platform, 2006 through 2011) is also covered. Cross-reference OEM part numbers include 3M5H-19D649-AA, 3M5Z-19849-AA, BP4K-61-J15, and YF09-61-J15. The valve is suitable for both original equipment replacement in factory AC systems and for professional aftermarket repairs. Its calibrated R134a metering characteristics provide consistent evaporator superheat control across all engine load and ambient temperature conditions, ensuring reliable cabin cooling performance from idle to highway cruising speeds. Always verify fitment against the vehicle VIN and existing OEM part number prior to ordering.

Every TXV-3M5H-DB expansion valve is individually sealed in an anti-static polyethylene bag with a silica gel desiccant sachet to prevent moisture absorption and port corrosion during transit and warehouse storage. The sealed bag is placed in a custom-fitted die-cut foam inner box that isolates the valve body, port sealing faces, and diaphragm housing from external impact and vibration forces. Inner boxes are consolidated into export-grade five-layer corrugated master cartons with reinforced corner posts, each containing 50 units and rated for stacking during ocean freight and intermodal container transport. Each production batch is accompanied by a comprehensive certificate of conformance documenting opening superheat setpoint verification, internal and external leakage test results, rated capacity at nominal conditions, and material certification for the brass body and stainless steel diaphragm raw stock. We maintain complete batch traceability with serial-numbered test records archived for a minimum of three years under our ISO 9001:2015 and IATF 16949:2016 certified quality management system. All expansion valve products comply with SAE J2767 and IMACA 300 testing protocols. A standard 12-month warranty against manufacturing defects applies from the date of shipment, with extended warranty terms available for volume contract customers. Neutral packaging is provided as standard; private-label branding, custom part numbering, and retail-ready packaging configurations are available upon request for distributors and chain store accounts.