Frequently Asked Questions About International S1700-S1900 Heat & AC Parts
Will these HVAC parts fit my specific International S-Series truck model and year?
Our heat and AC parts are designed for International S1700, S1800, and S1900 models typically manufactured from the mid-1980s through early 2000s. However, International made several variations during production years. To ensure proper fitment, check your OEM number and compare it with the part specifications listed on each product page. Common compatibility issues arise with trucks built during transition years (1999-2001) when International updated their HVAC systems. If you're unsure, contact us with your OEM and we'll verify compatibility before you order.
Are aftermarket blower motors and heater cores as reliable as OEM parts?
The aftermarket parts we carry meet or exceed OEM specifications and often come from the same manufacturers that supply International. Our blower motors typically last 5-7 years with regular use, comparable to factory units. Heater cores feature aluminum or copper-brass construction with reinforced tanks to prevent common failure points. Many customers report better performance from quality aftermarket parts compared to aging OEM components. All our HVAC parts come with manufacturer warranties ranging from 1-3 years depending on the component.
What tools and experience do I need to replace AC components myself?
Basic HVAC repairs like blower motor replacement require standard hand tools and take 1-2 hours. However, AC system work involOEMg refrigerant requires EPA certification and specialized equipment including a recovery machine, vacuum pump, and manifold gauges. Heater core replacement is labor-intensive, requiring dashboard removal and typically takes 4-6 hours. We recommend professional installation for compressors, condensers, and evaporators to ensure proper refrigerant handling and system performance. DIY-friendly parts include switches, resistors, and vent doors.
Why is my blower motor working but not producing enough airflow?
Reduced airflow usually indicates a clogged cabin air filter, blocked evaporator, or failing blower motor resistor rather than the motor itself. First, check and replace your cabin filter if equipped. International S-Series trucks commonly experience resistor failure, causing the blower to work only on high speed. Debris accumulation in the evaporator box is another frequent issue. Before replacing the blower motor, inspect these components. A motor drawing excessive amperage (over 25 amps on high) indicates bearing failure and requires replacement.
What's the difference between R12 and R134a AC systems in these trucks?
International used R12 refrigerant in S-Series trucks until approximately 1994-1995, then switched to R134a. You cannot mix these refrigerants or their components. R12 systems use mineral oil while R134a requires PAG oil. Key differences include fitting sizes (R12 uses flare fittings, R134a uses quick-connect), compressor design, and operating pressures. If converting from R12 to R134a, you'll need a conversion kit including new fittings, receiver-drier, proper oil, and system flush. Converted systems typically cool 10-15% less efficiently than original R12 systems.
