Frequently Asked Questions About Peterbilt 587 Heat & AC Parts

Will these heat and AC parts fit my specific Peterbilt 587 model year?

Most of our heat and AC components are designed to fit Peterbilt 587 models from 2008-2017. However, there can be variations based on your truck's specific build date and factory options. We recommend checking your VIN or existing part numbers before ordering. Key compatibility differences often occur between pre-2013 and post-2013 models, particularly with blower motor assemblies and control modules. If you're unsure, our team can help verify fitment with your truck's details.

What are the most common signs that my heater core or AC evaporator needs replacement?

For heater cores, watch for sweet-smelling coolant odor inside the cab, foggy windshield that won't clear, coolant puddles on the passenger floor, or lack of heat even when the engine is warm. AC evaporator failure typically shows as weak cooling, musty odors when AC runs, excessive moisture inside the cab, or visible refrigerant oil leaks under the dash. Both components usually require dash removal for replacement, so addressing issues early can prevent more extensive repairs.

Can I replace the blower motor without removing the entire HVAC box?

Yes, on most Peterbilt 587 models, the blower motor can be accessed and replaced without full HVAC box removal. It's typically located on the passenger side under the dash and can be removed after disconnecting the electrical connector and removing 3-4 mounting screws. The job usually takes 30-45 minutes. However, if you're experiencing poor airflow, also check the cabin air filter and blower resistor, as these are often the actual culprits and are even easier to replace.

Why do AC compressors fail prematurely, and how can I prevent it?

The most common causes of early compressor failure in Peterbilt 587s include low refrigerant levels, contaminated refrigerant, blocked orifice tubes, and running the AC with inadequate oil. To maximize compressor life, have your AC system serviced annually, replace the receiver-drier when opening the system, ensure proper refrigerant charge (typically 2.5-3.0 lbs of R134a), and run your AC for at least 10 minutes monthly during winter. Always replace both the compressor and receiver-drier together to prevent contamination.

What's included in a complete HVAC control module, and can I repair mine instead of replacing it?

A complete HVAC control module includes the control panel with temperature and fan speed controls, mode selection switches, and the internal circuit board. While some issues like stuck buttons or dim displays can be repaired, most electronic failures require full replacement. Common problems include erratic fan speeds, temperature control not responding, or complete power loss. Used modules can work but must match your exact part number. New aftermarket units typically cost less than OEM and include updated electronics that address common failure points.