Peterbilt 357/378 AC Vents

Frequently Asked Questions About Peterbilt 357/378 AC Vents

Will these AC vents fit my Peterbilt 357 or 378 without modification?

These vents are designed to match the factory dash opening and mounting configuration used on Peterbilt 357 and 378 models. However, exact fit can vary depending on the model year and whether your dash has been previously modified or replaced, so it's a good idea to compare the vent's dimensions and mounting style to your existing part before ordering.

Are these replacement vents made from the same material as the factory originals?

Most AC vents in this category are constructed from durable ABS plastic or similar composite materials, which is consistent with what Peterbilt used on original dash vents. This keeps the fit, feel, and appearance close to stock while standing up to daily cab temperature swings and UV exposure through the windshield.

Do these vents come in different finishes or colors?

Yes, depending on the specific part, you may find options in standard black plastic, chrome-plated, or paintable finishes. Chrome and billet-style vents are popular for drivers looking to upgrade the interior look, while black plastic vents offer a straightforward factory-match replacement.

How difficult is it to install a replacement AC vent?

Installation is generally straightforward and can be done with basic hand tools. Most vents snap or screw into the existing dash opening, and the job typically only requires removing the old or damaged vent and securing the new one in its place. No special equipment or professional installation is usually needed.

Will a new vent fix poor airflow or a rattling noise from my dash?

A cracked, loose, or broken vent housing can definitely cause weak airflow, rattling, or air leaking into unintended areas of the cab. Replacing a damaged vent with a properly fitted new one often resolves these issues, but if you're experiencing weak airflow throughout the whole system, it may also be worth checking your HVAC blower and ductwork for separate issues.