Frequently Asked Questions About Peterbilt 352 Heat & AC Parts

Will these AC parts fit my specific year Peterbilt 352?

Most heat and AC components for the Peterbilt 352 are compatible across model years 1969-1980, but there are some variations. Blower motors, heater cores, and evaporators typically interchange between all years. However, control panels and dash-mounted components may differ between early models (1969-1974) and later models (1975-1980). Always check the product description for specific year compatibility or contact our support team with your VIN for verification.

What are the most common signs I need to replace my heater core or evaporator?

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 insufficient heat output. Evaporator issues typically show as weak cooling, musty odors when AC runs, water dripping inside the cab instead of underneath, or visible corrosion on aluminum fins. Both components usually last 10-15 years but can fail earlier in harsh conditions.

Can I install these AC parts myself or do I need a professional?

Basic components like blower motors, resistors, and switches can typically be installed by experienced DIYers with standard tools. However, heater cores and evaporators require dashboard removal and can take 6-10 hours even for professionals. AC system components also require proper refrigerant handling equipment and EPA certification. We recommend professional installation for major components to ensure warranty coverage and proper system operation.

Are aftermarket AC parts as reliable as OEM for my Peterbilt 352?

Quality aftermarket parts from reputable manufacturers like Red Dot, Bergstrom, and Aurora often match or exceed OEM specifications. These parts use modern materials and improved designs while maintaining exact fit. Look for parts with aluminum cores (not plastic), sealed bearing blower motors, and at least a 1-year warranty. Avoid extremely cheap options as they often use inferior materials that fail within months.

Why is my new blower motor not working after installation?

The most common issue is a failed blower motor resistor, which controls fan speeds and often fails when the original motor burns out. Always replace the resistor when installing a new blower motor. Also check the 30-amp fuse in the fuse panel, ensure proper ground connection at the motor mount, and verify 12V power at the motor connector. Some 352 models have a separate relay that may also need replacement.