Peterbilt 375/377 Winter Fronts & Bug Screens

Frequently Asked Questions About Peterbilt 375/377 Winter Fronts & Bug Screens

What is the difference between a winter front and a bug screen?

A winter front is a solid or heavily insulated cover that mounts over the grille to block cold air from reaching the radiator, helping the engine reach and maintain proper operating temperature in cold weather. A bug screen is a mesh or perforated panel that mounts in front of the grille to keep insects, road debris, and light chaff from clogging the radiator core during warmer months. Some products combine both functions with removable panels or flaps you can adjust seasonally.

Will this fit my Peterbilt 375 or 377 without modification?

Winter fronts and bug screens for the 375/377 are designed to mount using the existing grille hardware or factory mounting points, so no cutting or drilling is typically required. That said, grille styles and years can vary, so it is important to confirm your specific hood and grille configuration against the product listing before ordering. If you are unsure, checking your VIN or measuring your existing grille opening can help avoid a fitment mismatch.

What materials are these made from, and how do they hold up over time?

Most winter fronts are made from heavy-duty vinyl, canvas, or coated fabric stretched over a frame, while bug screens are typically aluminum, stainless steel, or heavy-gauge mesh. Material choice affects durability and appearance, with metal screens generally offering more long-term resistance to wear, while fabric fronts are valued for being lightweight and easy to roll up or remove. Look at the specific product description for material details, since options and lifespan can vary between manufacturers.

How do I install and remove it, and can I use it seasonally?

Installation usually involves securing the winter front or bug screen to existing grille slots, clips, or bolt holes, often without any tools required beyond what is provided with the product. Many drivers switch between a winter front in colder months and a bug screen or open grille in warmer months, so look for products designed for quick removal and reinstallation if you plan to swap them out seasonally.

Can using a winter front cause my engine to overheat?

A winter front is meant to be used only in cold weather conditions, since restricting airflow to the radiator in warm weather can cause the engine to run hotter than normal. Always monitor your coolant temperature gauge after installing a winter front and remove or open it if temperatures start climbing outside the normal operating range, especially during idling, hill climbs, or warmer stretches of weather.