Freightliner SD 108-122 Heat & AC Parts

Frequently Asked Questions About Freightliner SD 108-122 Heat & AC Parts

Will these HVAC parts fit my specific Freightliner SD model year?

Our heat and AC parts are designed for Freightliner SD models 108, 112, 114, and 122 manufactured between 2002 and 2011. However, there can be variations in HVAC systems even within the same model year. We recommend checking your OEM or existing part numbers before ordering. Common compatible part numbers include heater cores (22-50067-000), blower motors (BOA80-115-11263), and evaporator cores (4379-RD545010P). If you're unsure, contact us with your truck's OEM and we'll verify compatibility.

How difficult is it to replace the heater core or evaporator in these models?

Replacing HVAC components in Freightliner SD trucks typically requires 4-8 hours of labor, depending on the part. Heater core replacement involves removing the dashboard assembly and HVAC box, which requires basic hand tools and some mechanical experience. Evaporator replacement is more complex, requiring refrigerant recovery and recharge. Many drivers tackle heater cores themselves, but we recommend professional installation for AC components to ensure proper refrigerant handling and system performance.

What's the difference between OEM and aftermarket HVAC parts for my Freightliner?

OEM parts are manufactured to exact Freightliner specifications and typically carry a higher price point but ensure perfect fit and performance. Our aftermarket options from brands like Red Dot, Bergstrom, and Four Seasons meet or exceed OEM standards at 30-50% less cost. Key differences include warranty length (OEM typically 1 year, aftermarket 6-12 months) and minor variations in mounting brackets. Both options use aluminum cores and copper tubes for durability in commercial applications.

Why is my AC blowing warm air even after replacing the compressor?

A new compressor alone won't fix all AC issues. Common culprits include low refrigerant levels, clogged expansion valves, failing condensers, or electrical problems with the clutch cycling switch. For SD models, also check the evaporator temperature sensor (common failure point) and ensure the blend door actuator is functioning properly. We stock complete AC diagnostic kits and individual components. Start with a pressure test and electrical diagnosis before replacing major components.

Are there upgraded blower motor options that last longer than stock?

Yes, we offer heavy-duty blower motor upgrades specifically addressing the common failure points in stock units. Our premium motors feature sealed bearings, balanced wheels, and reinforced mounting plates that typically last 2-3 times longer than standard replacements. Popular upgrades include the Red Dot RD-5-8657-0P and Bergstrom 1000713, both direct-fit replacements requiring no modifications. These units draw the same amperage but provide improved airflow and reduced cabin noise.