Peterbilt 359 Heat & AC Parts

Frequently Asked Questions About Peterbilt 359 Heat & AC Parts

What years of Peterbilt 359 trucks are these heat and AC parts compatible with?

Most of our heat and AC parts are designed to fit Peterbilt 359 models from 1967 through 1987. However, compatibility can vary depending on the specific part and whether your truck has factory air conditioning or aftermarket systems. We recommend checking the individual product descriptions or contacting our support team with your truck's OEM and year for exact fitment confirmation.

Are these genuine Peterbilt OEM parts or aftermarket replacements?

We carry both OEM and high-quality aftermarket options. OEM parts are clearly labeled in our product listings and typically come with manufacturer warranties. Our aftermarket parts are sourced from reputable suppliers who specialize in heavy-duty truck components and often provide comparable quality at more affordable prices. Each product page specifies whether the part is OEM or aftermarket.

How difficult is it to replace the heater core or AC evaporator in a Peterbilt 359?

Replacing these components typically requires 4-6 hours of labor and intermediate mechanical skills. The dash panel and HVAC box usually need to be partially removed to access the heater core or evaporator. Common challenges include disconnecting old hose fittings without damage and properly sealing the new unit to prevent leaks. We recommend having a service manual on hand and allowing extra time for older trucks where corrosion may complicate removal.

What are the most common AC and heating problems in Peterbilt 359 trucks?

The most frequent issues we see are leaking heater cores (indicated by coolant smell or foggy windshield), failed blower motor resistors causing fan speed problems, and AC compressor clutch failures. For trucks over 20 years old, deteriorated hoses and O-rings are also common culprits. Many of these problems can be diagnosed by checking for coolant leaks, testing electrical connections, or listening for unusual compressor noises.

Do you offer complete HVAC upgrade kits for older Peterbilt 359 models?

Yes, we stock several retrofit kits that can upgrade older R12 systems to modern R134a refrigerant, as well as complete heating and cooling packages for trucks that originally came without factory air. These kits typically include the compressor, condenser, evaporator, hoses, and necessary mounting hardware. Installation generally requires professional expertise due to refrigerant handling requirements and system evacuation procedures.