The Air conditioning system is the comprehensive climate control solution for the HOWO MAX 4X2 tractor cab, providing cooling, heating, and ventilation for optimal driver comfort in all weather conditions. This genuine HOWO Air conditioning system kit includes the complete HVAC assembly, automatic control panel, heater water pipe, external air inlet grille, evaporator pipe bracket, and all necessary fasteners – everything needed for a full A/C system service or replacement. When you choose authentic Howo Parts, this Air conditioning system guarantees OE fitment, efficient cooling, and reliable operation. Below are detailed descriptions of every component included with this Air conditioning system assembly.
The air conditioner assembly is the main HVAC unit of the Air conditioning system, housing the evaporator, heater core, blower motor, and expansion valve in a single compact housing. This unit is engineered for the HOWO NX cab, providing powerful cooling and heating capacity to maintain cabin comfort. The housing is made from impact‑resistant ABS plastic with foam insulation to prevent condensation and maximise efficiency. The blower motor operates at multiple speeds via the automatic control panel.
Six M6 flange bolts are supplied to secure the Air conditioning system components, including the HVAC assembly and the evaporator pipe bracket. These grade 8.8 bolts feature an integral flange that distributes clamping load, eliminating the need for separate washers. They are zinc‑plated for corrosion resistance and torqued to 10 Nm for secure, vibration‑proof fastening.
The heater water pipe is a pre‑formed rubber hose that circulates engine coolant through the heater core of the Air conditioning system. This pipe is made from EPDM rubber with a textile reinforcement, rated for coolant temperatures up to 120°C. It includes molded bends that match the HOWO NX engine bay routing, ensuring a perfect fit and preventing kinking that would restrict coolant flow.
The automatic control panel is the user interface for the Air conditioning system, featuring a digital display and rotary knobs for temperature, fan speed, and mode selection. This panel incorporates a built‑in temperature sensor and communicates with the HVAC module to maintain the set cabin temperature automatically. The panel has a sleek, modern design that matches the HOWO NX dashboard, with backlit buttons for night operation.
The externally circulated air inlet grille is a plastic component that covers the fresh air intake opening on the cab exterior. This Air conditioning system component allows outside air to enter the HVAC unit while preventing leaves, insects, and debris from entering the system. It is made from UV‑stabilised ABS with a honeycomb pattern for maximum airflow and protection.
Four M6 metal round nuts are used to secure the control panel and other trim components of the Air conditioning system. These captive nuts are pressed into plastic mounting bosses, providing a strong, reusable threaded insert for screws. They are made from zinc‑plated steel with a serrated outer surface that locks them into position.
This bracket supports the evaporator inlet and outlet pipes, keeping them securely positioned within the Air conditioning system. It is made from stamped steel with a rubber‑lined clamp that prevents chafing and absorbs vibration. The bracket ensures that the refrigerant pipes remain correctly aligned, preventing stress on the connections.
The evaporator inlet and outlet pipe clamp secures both the high‑pressure and low‑pressure refrigerant lines together, keeping them organised and protected from moving parts. This Air conditioning system clamp is made from nylon with a metal insert for strength, and it snaps easily onto the pipe bracket without tools.
Seven Torx pan head screws (Q215B0620) are used to secure the air inlet grille and other trim components of the Air conditioning system. The Torx drive provides secure engagement and reduces cam‑out during installation. The screws are made from stainless steel, offering excellent corrosion resistance and a durable finish.
Four self‑tapping screws with a hexagon flower pan head are supplied to secure the automatic control panel and other interior trim. These Air conditioning system screws are made from case‑hardened steel with a phosphate coating, providing strong thread engagement in the plastic dashboard components.
Air conditioning system – genuine HOWO complete HVAC unit and component kit for MAX 4X2
This Air conditioning system kit includes the HVAC unit, control panel, water pipe, grille, brackets, and all fasteners – everything required for a full A/C system installation or overhaul on the HOWO MAX 4X2.
The air conditioner assembly is manufactured to SINOTRUK’s original specifications, providing the same cooling and heating performance as the factory‑installed Air conditioning system, ensuring consistent cabin comfort.
The automatic control panel allows the driver to set the desired cabin temperature, and the Air conditioning system automatically adjusts fan speed and cooling output to maintain it, reducing driver distraction and improving comfort.
This Air conditioning system kit includes every bolt, screw, nut, and clamp needed for installation. Using the correct fasteners ensures a rattle‑free, secure installation and prevents damage to the HVAC components.
The Air conditioning system on the HOWO MAX 4X2 uses a refrigerant circuit (R‑134a) to cool the cabin. The compressor, driven by the engine, compresses refrigerant gas and sends it to the condenser, where it releases heat and becomes a liquid. The liquid refrigerant then passes through the expansion valve, where it expands and cools rapidly before entering the evaporator inside the HVAC assembly.
The cabin blower motor draws air across the evaporator fins, cooling the air before it enters the cabin. For heating, engine coolant is circulated through the heater core, and the blower passes air over the core to warm the cabin. The automatic control panel receives temperature feedback from a cabin sensor and adjusts the blend doors and blower speed to maintain the set temperature.
The heater water pipe carries hot coolant from the engine to the heater core. The external air inlet grille allows fresh air to enter the system when the recirculation mode is not engaged. A properly functioning Air conditioning system keeps the driver alert and comfortable, reducing fatigue on long trips.
Before installation, discharge the A/C refrigerant and disconnect the battery. Remove the old HVAC unit and control panel. Clean the mounting surfaces. Install the new air conditioner assembly into the dashboard, securing it with the M6 flange bolts (torque to 10 Nm).
Connect the heater water pipe to the heater core and engine coolant lines. Mount the evaporator inlet and outlet pipe bracket and secure the pipes with the pipe clamp. Install the external air inlet grille from outside the cab. Install the automatic control panel into the dashboard,
securing it with the metal round nuts and tapping screws. Connect all electrical connectors and the temperature sensor. Reconnect the battery and recharge the Air conditioning system with the correct amount of R‑134a refrigerant (refer to the vehicle specifications). Test the system by operating the controls and checking for leaks with a refrigerant leak detector. The Air conditioning system installation is now complete.
If the Air conditioning system does not cool, check the refrigerant level and the compressor engagement. A low refrigerant charge indicates a leak; inspect all connections with a leak detector. If the blower does not operate, check the fuse and the blower motor connector.
If the heater does not produce hot air, inspect the heater water pipe for kinks or blockages. A noisy HVAC unit may indicate a failing blower motor bearing or debris in the evaporator housing.
If the automatic control panel does not respond, check the wiring harness and the ground connection. If the external air inlet grille is blocked, clean it to restore airflow. Always use genuine Air conditioning system components for repairs to maintain proper fit and performance.
Inspect the Air conditioning system annually or every 40,000 km. Check the refrigerant pressure and top up if needed. Replace the cabin air filter (not included) at every service to maintain airflow and air quality. Inspect the heater water pipe for signs of cracking or swelling; replace if any damage is found.
Clean the external air inlet grille to ensure unrestricted airflow. Check the control panel for proper operation and clean the screen with a soft cloth. If the system produces unusual odours, use an A/C evaporator cleaner spray to eliminate bacteria and mold. Regular maintenance of the Air conditioning system extends its service life and maintains cabin comfort.
This Air conditioning system kit is specifically designed for the HOWO MAX 4X2 tractor with the HOWO NX cab interior. It is compatible with all production years from 2018 onward. The HVAC unit is designed for 24V electrical systems and uses R‑134a refrigerant. The control panel is a direct fit for the NX‑G dashboard.
This Air conditioning system kit is also suitable for SITRAK C7H and HOWO T7H models that share the same cab architecture and HVAC mounting points. It is not compatible with older A7 or WD615 models, which have different dashboard layouts and HVAC unit dimensions. Always verify your vehicle’s cab type and A/C system specifications before ordering.
Aftermarket Air conditioning system components often use lower‑quality evaporators and heater cores that fail prematurely, leading to costly repairs. Generic control panels may not communicate correctly with the vehicle’s CAN bus, causing erratic operation. Non‑genuine water pipes may degrade quickly, leaking coolant and damaging other components.
A failed A/C system can make the cab uncomfortable and significantly reduce the vehicle’s resale value. Genuine HOWO Air conditioning system components are manufactured to SINOTRUK’s exacting standards, using certified materials, precise calibration, and durable construction.
The small additional cost of a genuine Air conditioning system is far outweighed by the comfort, reliability, and value it provides to the vehicle and its operator.
We are a heavy-duty truck parts store. Please leave your contact information and inquiries. We will respond within 12 hours.
