Frequently Asked Questions About Kenworth T800 Heat & AC Parts

What years of Kenworth T800 trucks are your HVAC parts compatible with?

Our heat and AC parts are designed to fit Kenworth T800 models from 1986 through 2015. However, there were significant HVAC system changes in 2003 when Kenworth updated to the R134a refrigerant system. Parts for pre-2003 models (R12 systems) are not interchangeable with 2003-2015 models. Always verify your truck's build date and VIN before ordering to ensure proper fitment, as some transition year trucks may have either system.

Are aftermarket heater cores and AC evaporators as reliable as OEM parts?

Quality aftermarket heater cores and evaporators can match or exceed OEM performance when sourced from reputable manufacturers. Look for parts with aluminum cores, brass tanks, and proper fin density (14-16 fins per inch for heater cores). Many aftermarket options feature upgraded materials like thicker aluminum cores that resist corrosion better than original parts. Avoid the cheapest options as they often use thinner materials and poor brazing that can fail within months.

How difficult is it to replace the heater core in a T800, and what tools are needed?

Heater core replacement is a 4-6 hour job that requires dashboard removal in most T800 models. You'll need basic hand tools, a drill with step bits for potential mounting modifications, coolant recovery equipment, and patience. The main challenges are accessing mounting bolts behind the dash, disconnecting multiple electrical connectors without breaking clips, and properly sealing the firewall penetrations. Many drivers report success doing it themselves, but having a service manual for your specific year is highly recommended.

What are the most common AC compressor options, and which is best for my T800?

The most common compressor types for T800 trucks are the Sanden SD7H15 (pre-2003) and the newer Sanden 4000 series or Denso 10PA series (2003+). For heavy-duty applications or extreme climates, the Sanden 4739 offers superior cooling capacity with its larger displacement. Clutch configuration varies by engine model - Caterpillar engines typically use 2-groove pulleys while Cummins ISX engines use 8-groove. Always match your compressor to your existing bracket and belt configuration to avoid costly modifications.

Why is my new blower motor making noise, and how can I prevent premature failure?

New blower motor noise often indicates improper installation or debris in the squirrel cage. Before installation, always clean the blower housing thoroughly and check for leaf buildup or damaged insulation. Ensure the motor is centered properly in the housing - misalignment causes bearing wear and noise within weeks. Use dielectric grease on electrical connections to prevent corrosion, and verify your truck's blower resistor is functioning correctly, as a faulty resistor causes motors to run at incorrect speeds and fail prematurely.