Explore our engineering-grade thermal solutions designed for high performance under extreme pressures and dynamic temperature ranges.
Established in 2007, Zhejiang Rock Auto Co., Ltd. has established itself as an authoritative global manufacturer, exporter, and original equipment manufacturer (OEM) specializing in high-performance vehicle thermal control components. With over 15 years of continuous industrial experience, our engineering unit designs and produces cutting-edge cooling architectures tailored for Internal Combustion Engine (ICE) platforms, Hybrid Electric Vehicles (HEV), and pure Battery Electric Vehicles (BEV).
Our state-of-the-art facility is certified under ISO/TS 16949 & IATF 16949 quality management systems. Our plant is equipped with advanced automated Controlled Atmosphere Brazing (CAB) furnaces, ultra-high-speed fin formers, automated core stackers, and precision CNC tube manipulators. We specialize in producing complete heat exchange systems including radiator tubes, intercooler tubes, oil cooler tubes, as well as finished radiators, intercoolers, HVAC evaporators, condensers, and oil coolers.
The transition from traditional Internal Combustion Engines (ICE) to New Energy Vehicles (NEVs) has fundamentally redefined automotive climate control. Thermal management is no longer an isolated comfort feature—it is a critical subsystem impacting vehicle safety, battery health, fast-charging performance, and total driving range.
Modern EV climate systems leverage multi-source heat pumps utilizing ambient heat, motor waste heat, and inverter energy. By utilizing low-pressure microchannel heat exchangers and electronic expansion valves (EEVs), integrated heat pumps reduce HVAC energy consumption by up to 60% during sub-zero operations, dramatically reclaiming lost winter driving range.
With worldwide phase-outs of high Global Warming Potential (GWP) hydrofluorocarbons like R134a, thermal engineering has migrated toward R1234yf and natural refrigerants like R744 (transcritical CO2). These systems operate under significantly higher working pressures (up to 130 bar for CO2), requiring burst-proof extruded aluminum flat tubes and specialized brazing alloys.
Cabin HVAC is now intrinsically linked to the Battery Thermal Management System. Dual-loop cooling circuits utilize plate heat exchangers (chillers) to transfer thermal energy between cabin refrigerant loops and liquid battery cooling plates, guaranteeing optimal cell operating temperatures between 25°C and 35°C even during 350kW ultra-fast charging sessions.
Sourcing custom OEM climate control components from Zhejiang Rock Auto Co., Ltd. provides global OEMs and Tier-1 suppliers with an unmatched synthesis of cost competitiveness, material science expertise, and manufacturing agility.
We utilize high-purity aluminum alloys (such as 3003, 6063, and multi-layer clad alloys 4343/3003/4343). These materials offer superior thermal conductivity, exceptional brazeability, and advanced zinc-layer sacrificial corrosion protection, enduring over 1,500 hours of ASTM B117 salt spray testing.
With in-house tooling capabilities—including our proprietary Modular Quick-Change Edge Plate Stamping Die System—we reduce prototype iteration time from months to days. OEM clients can validate custom core dimensions, header designs, and tube geometry with minimal upfront tooling costs.
Every HVAC component undergoes rigorous validation protocols: helium mass spectrometer leak detection (down to 10⁻6 mbar·l/s), thermal cycling testing (-40°C to +150°C), pressure impulse fatigue testing (over 250,000 cycles), and bursting pressure testing exceeding 10 MPa.
Our thermal exchange products are engineered to solve diverse operational challenges across multiple industrial sectors around the globe.
Ultra-compact HVAC heater cores, high-efficiency condensers, and direct-expansion evaporators optimized for constrained engine bays and aerodynamic EV front ends.
Heavy-duty 100V-600V battery liquid cooling packs and high-capacity rooftop HVAC condensers tailored for continuous duty-cycle transit buses and long-haul delivery trucks.
Ruggedized dry fluid coolers, heavy-wall finned radiator tubes, and vibration-resistant hydraulic oil coolers designed to endure severe off-road dust, impact, and shock loads.
Specialized seamless knurled marine alloy aluminum tubing and plate heat exchangers for high-salinity marine climate units, packaging plants, and specialized molding machinery.
Comprehensive mechanical and thermal specifications for custom OEM manufacturing integration.
| Component Category | Primary Alloys | Core Thickness Range | Burst Pressure Rating | Corrosion Resistance (Salt Spray) | Target Applications |
|---|---|---|---|---|---|
| Microchannel Evaporator / Condenser | AA3003 / AA4343 Clad | 12mm – 26mm | ≥ 9.8 MPa | > 1,000 Hours (ASTM B117) | Automotive Passenger HVAC Systems |
| EV Battery Liquid Cooling Plate | AA6063-T6 / AA3003 | 5mm – 15mm | ≥ 3.5 MPa | > 1,500 Hours (SWAAT) | BEV & HEV Battery Thermal Management |
| Heavy Duty Charge Air Cooler (Intercooler) | AA3003 / Structural 6061 | 32mm – 100mm | ≥ 4.5 MPa | > 1,200 Hours | Turbocharged Engine & Mining Equipment |
| Automotive Heater Core | AA3003 Hard Temper | 16mm – 42mm | ≥ 2.5 MPa | > 800 Hours | Cabin Heating & HVAC Climate Modules |
| Marine Grade Heat Exchanger Tubing | Precision Knurled 5052/6063 | Wall 0.8mm – 2.5mm | ≥ 15.0 MPa | > 2,000 Hours (Severe Marine Environment) | Marine Cooling & Heavy Industrial Process |
We offer seamlessly integrated engineering services from initial concept and CFD thermal simulation to mass production and Just-In-Time (JIT) global logistics delivery.
ANSYS Fluent CFD fluid dynamic calculation, heat transfer coefficient validation, and structural FEA analysis under thermal shock loads.
Sample fabrication utilizing laser-welded headers, high-precision fin forming dies, and experimental CAB furnace runs within 14 business days.
Rigorous Advanced Product Quality Planning, offering complete Level 3 Production Part Approval Process documentation (PPAP) for global Tier-1 OEMs.
Automated high-volume assembly lines with real-time vision inspection, helium tracing leak checks, and global containerized shipping logistics.
Detailed answers to common engineering, procurement, and thermal design inquiries from automotive buyers.
Comprehensive catalog of custom extruded tubing, EV energy storage packs, and modular tooling equipment.
To deliver high-quality, ultra-reliable, and cost-effective thermal cooling solutions that exceed OEM customer expectations while driving continuous technological innovation and sustainable manufacturing practices worldwide.
To become the global leader in automotive thermal management and climate control components, renowned for advanced metallurgy, digital engineering integration, and environmental stewardship.
Rock Auto
