Flex Technologies CAC40P-350X6 Silicone Charge Air Cooler Hose – 3.5" x 6" Cold Side

The Flex Technologies CAC40P-350X6 is a premium 4-ply silicone charge air cooler hose designed for cold side intake applications on heavy-duty diesel trucks. Measuring 3.5" inside diameter by 6" in length, this boot delivers superior durability and flexibility across extreme temperature ranges from -65°F to +350°F. The polyester-reinforced construction resists ozone degradation and oil splash exposure, making it ideal for the demanding environment of turbocharged diesel engines where reliable boost pressure is critical for performance.

Signs You Need a New Charge Air Cooler Hose

• Visible cracks, splits, or dry rot on hose surface
• Soft or spongy feel indicating internal delamination
• Oil residue or wetness around hose connections
• Loss of boost pressure or reduced engine power
• Audible air leaks or hissing under acceleration
• Check engine light with boost pressure fault codes
• Decreased fuel economy
• Collapsed or kinked hose restricting airflow

Specifications

Features

• 4-ply silicone construction for maximum durability and flexibility
• Ozone and oil splash resistant for long service life
• Suitable for heavy-duty diesel applications
• Meets and exceeds Mil-Spec A-A-52426 and OEM heavy-duty vehicle requirements
• Available with Nomex reinforcement (orange) for higher temperature applications
• Wide temperature range handles extreme cold starts to full operating temps

Applications

This 3.5" cold side charge air cooler hose fits various heavy-duty diesel trucks and equipment requiring a 3.5" ID x 6" length boot on the cold side (post-intercooler) of the turbo system, including:

• Freightliner Cascadia, Columbia, Century (select applications)
• Kenworth T680, T880, W900, T800 (select applications)
• Peterbilt 579, 389, 388, 387 (select applications)
• International ProStar, LT, LoneStar (select applications)
• Volvo VNL, VNR (select applications)
• Mack Anthem, Pinnacle, Granite (select applications)

Additional Sizes

Cold Side (CAC40P Series):

• CAC40P-300X6 – 3" x 6"
• CAC40P-400X6 – 4" x 6"
• CAC40P-400X8 – 4" x 8"
• CAC40P-450X6 – 4.5" x 6"

Hot Side (CAC40 Series):

• CAC40-350X6 – 3.5" x 6"
• CAC40-400X6 – 4" x 6"
• CAC40-400X8 – 4" x 8"
• CAC40-450X6 – 4.5" x 6"

Measure your existing hose inside diameter and length before ordering. Ensure clamp compatibility with 0.16" wall thickness.