Peterbilt 359 CAC Clamps, Boots & Hoses

Frequently Asked Questions About Peterbilt 359 CAC Clamps, Boots & Hoses

Will these CAC (Charge Air Cooler) components fit my specific year Peterbilt 359?

Most CAC clamps, boots, and hoses for the Peterbilt 359 are designed to fit models from 1967-1987, but there can be variations depending on your engine type and whether you have aftermarket modifications. For Caterpillar 3406B/C engines, you'll typically need 5-inch diameter components, while Detroit Series 60 engines often require 5-inch parts. Always check your existing hose diameter and measure the connection points before ordering. If you're unsure, contact us with your OEM and engine model for exact fitment confirmation.

What's the difference between standard rubber and silicone CAC hoses, and which should I choose?

Standard rubber hoses typically last 3-5 years and work well for most applications, handling temperatures up to 250°F and pressures up to 50 PSI. Silicone hoses are a premium upgrade that can last 8-10 years, withstand temperatures up to 500°F, and handle pressures up to 80 PSI. Silicone also resists oil and coolant contamination better. If you're running higher boost levels, frequent heavy loads, or want maximum longevity, silicone is worth the investment. For standard highway use, quality rubber hoses perform adequately at a lower cost.

How difficult is it to replace CAC boots and hoses, and what tools do I need?

Replacing CAC components is a moderate DIY job that typically takes 1-2 hours. You'll need basic hand tools including flathead and Phillips screwdrivers, pliers, and a socket set (usually 5/16" or 8mm for clamp bolts). The trickiest part is accessing tight spaces near the firewall. Pro tip: warm the new boots in hot water before installation to make them more pliable. Always replace clamps when changing hoses, and apply a thin layer of silicone spray to ease installation. Make sure to properly torque clamps to 60-80 inch-pounds to prevent boost leaks.

What are the signs I need to replace my CAC hoses and boots?

Common indicators include: visible cracks or bulging in the rubber, oil residue around connection points (indicating boost leaks), decreased fuel economy, black smoke under acceleration, or whistling sounds when the turbo spools up. Soft, spongy spots in hoses indicate internal deterioration. During inspection, squeeze the hoses - they should feel firm but flexible. If they're rock hard or mushy, replacement is needed. Even without visible damage, consider replacing rubber hoses every 5 years as preventive maintenance, especially in extreme climate conditions.

Do I need special heavy-duty clamps, or will standard clamps work?

For stock boost levels (under 30 PSI), quality standard T-bolt clamps work fine. However, if you're running modified turbos with boost over 35 PSI, invest in heavy-duty stainless steel T-bolt clamps with wider bands (at least 3/4" wide). Spring-loaded constant tension clamps are excellent for connections that experience frequent temperature cycling. Avoid using standard worm-gear clamps on CAC connections - they don't provide even clamping pressure and are prone to loosening. When installing any clamp, ensure it's positioned at least 1/4" from the hose end to prevent tearing.