Peterbilt 330/335/337 Fan Blades & Shrouds

Frequently Asked Questions About Peterbilt 330/335/337 Fan Blades & Shrouds

Will these fan blades and shrouds fit my specific Peterbilt 330, 335, or 337 model year?

Most fan blades and shrouds for these models are compatible with years 2005-2015, but fitment can vary based on your engine type and cooling package. Check your current fan blade diameter (typically 22" or 24") and mounting bolt pattern before ordering. If you're unsure, locate your OEM and contact us with your specific engine model (CAT C7, Cummins ISB, or Paccar PX series) for exact fitment verification.

What's the difference between steel and composite fan blades, and which should I choose?

Steel fan blades are more durable and better for heavy-duty applications or extreme conditions, but they're heavier and can reduce fuel efficiency. Composite (fiberglass or nylon) blades are lighter, quieter, and may improve fuel economy, but may need replacement more frequently in dusty environments. For most medium-duty applications, composite blades offer the best balance of performance and efficiency.

Can I install a new fan blade and shroud myself, or do I need special tools?

Installation typically takes 2-3 hours and requires basic hand tools plus a fan clutch wrench (if replacing the clutch). You'll need to drain some coolant, remove the upper radiator hose, and work in tight spaces. The most challenging part is aligning the shroud properly to prevent vibration. Many customers successfully DIY this job, but if you're not comfortable working around the cooling system, professional installation runs $150-300.

How do I know if I need to replace just the blade or the entire shroud assembly?

Inspect your fan blade for cracks, missing pieces, or excessive wobble when spun by hand. Check the shroud for cracks around mounting points and ensure it's not touching the fan blade. If the shroud is intact and properly mounted but the fan blade is damaged, you can replace just the blade. However, if the shroud has cracks or the fan has made contact with it, replace both to prevent future damage and ensure proper airflow.

What's the typical lifespan of these components, and what are signs of failure?

Quality fan blades typically last 150,000-250,000 miles, while shrouds can last the life of the truck if undamaged. Warning signs include increased engine temperature, excessive fan noise, visible cracks or chips, engine vibration at idle, and reduced A/C performance. Regular inspection during oil changes can catch issues early. In dusty or severe-duty applications, expect to replace blades 25-30% more frequently.