Frequently Asked Questions About International RH Heat & AC Parts
Will these heater and AC parts fit my specific International RH model year?
Our International RH heat and AC parts are designed to fit RH models from 2018 to present. However, there can be variations based on your specific configuration. Always verify compatibility by checking your OEM or existing part numbers. Key differences exist between early production years (2018-2020) and newer models, particularly in blower motor assemblies and control module connections. If you're unsure, contact our support team with your OEM and we'll confirm exact fitment.
What are the most common installation challenges when replacing RH heater cores or evaporators?
The biggest challenge is accessing the HVAC box, which requires removing the dashboard assembly. Most installations take 6-8 hours for experienced techs. Common issues include: disconnecting the refrigerant lines (requires EPA certification), properly aligning the heater core tubes through the firewall, and ensuring all foam seals are replaced to prevent air leaks. We recommend having a factory service manual on hand, as reassembly sequence is critical for proper fitment of dash components.
Are aftermarket blower motors and resistors as reliable as OEM parts?
Quality varies significantly among aftermarket suppliers. We carry both OEM and premium aftermarket options. OEM parts typically last 150,000-200,000 miles, while quality aftermarket units achieve 100,000-150,000 miles. The main differences are in motor bearing quality and resistor heat dissipation. Avoid budget options under $50 for blower motors, as they often fail within 20,000 miles due to inferior brushes and bearings. Our recommended aftermarket brands use sealed bearings and upgraded resistor materials.
Why is my new AC compressor not engaging, even though I installed it correctly?
This is commonly due to low refrigerant pressure triggering the safety switch. The system must be properly evacuated and charged with the correct R134a amount (typically 2.5-3.0 lbs for RH models). Also check: the compressor clutch gap (should be 0.016-0.031 inches), electrical connections at the pressure switches, and ensure the AC relay in the fuse box is functioning. Some 2020+ models require a computer relearn procedure after compressor replacement.
What's the difference between standard and heavy-duty heater cores for International RH trucks?
Heavy-duty cores feature thicker aluminum cores (1.5 inch vs 1 inch) and reinforced tank connections, ideal for severe duty applications or extreme cold climates. They provide approximately 15-20% more heat output but may require slight modification to mounting brackets on some model years. Standard cores work fine for most highway applications. Heavy-duty units add about 2 pounds of weight and cost 30-40% more, but typically last 50% longer in harsh conditions.
