Frequently Asked Questions About Kenworth Cabover Heat & AC Parts
Will these HVAC parts fit my specific Kenworth cabover model and year?
Our Kenworth cabover heat and AC parts are designed to fit K100, K100E, and W900A models from 1963 through 1990. However, Kenworth made several mid-year changes and variations, so we recommend checking your OEM or calling us with your specific model year and cab configuration. Parts for aerodyne versus standard cabs may differ, and some components changed when Kenworth switched from R12 to R134a refrigerant systems in the late 1980s.
What are the most common HVAC components that fail on Kenworth cabovers?
Based on customer feedback, the most frequently replaced items include heater cores (often due to corrosion or clogging), blower motor resistors, AC compressor clutches, and evaporator cores. The heater control valves are also prone to sticking or leaking after 20-30 years of service. We stock OEM-spec replacements for all these components, with many customers reporting that our aftermarket heater cores actually outlast the originals due to improved aluminum construction.
Can I upgrade my old R12 AC system to R134a using these parts?
Yes, many of our AC components are compatible with R134a conversions. You'll need to replace the compressor, receiver-drier, expansion valve, and all O-rings and seals. We offer complete conversion kits that include the proper fittings, oil, and detailed instructions. Keep in mind that R134a systems typically cool about 10-15% less efficiently than R12, so ensuring your condenser and evaporator are clean and in good condition is crucial for optimal performance.
How difficult is it to replace the heater core in a Kenworth cabover?
Heater core replacement is one of the more challenging HVAC repairs on these trucks, typically requiring 4-6 hours for an experienced mechanic. You'll need to remove the passenger side dash panels and potentially the glove box assembly. The biggest challenge is accessing the heater box mounting bolts behind the dash. We recommend having a factory service manual on hand, and many customers find it easier to replace the blower motor and resistor at the same time since you'll already have everything apart.
Are aftermarket HVAC parts as reliable as OEM Kenworth parts?
The aftermarket parts we carry meet or exceed OEM specifications and often incorporate design improvements based on common failure points of original components. For example, our heater cores use thicker wall tubing and improved end tank designs. Many customers report equal or better longevity compared to OEM parts at a fraction of the cost. All our HVAC components come with at least a 1-year warranty, and we only stock parts from established manufacturers with proven track records in the heavy truck industry.
