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

Flex Technologies CAC40P-350X6 is a 4-ply silicone cold-side charge air cooler hose, 3.5" inside diameter by 6" long, for the post-intercooler section of turbocharged heavy-duty diesel boost piping. Polyester reinforcement, 0.16" wall thickness, rated -65°F to +350°F, ozone- and oil-splash-resistant, and built to Mil-Spec A-A-52426. Sold as a single straight boot.

Signs You Need a New Charge Air Cooler Hose

• Visible cracks, splits, or dry-rotted rubber on the hose surface
• Soft, spongy, or delaminated feel when flexed by hand
• Oil residue, soot, or wetness around the clamp ends after a hard pull
• Loss of boost, slow throttle response, or noticeable power drop under load
• Audible hiss or whoosh from the boost piping during acceleration
• Boost-pressure or MAP-related fault codes lighting the dash
• Hose collapsing inward under high boost or kinking when the engine moves on its mounts

Specifications

Applications

This 3.5" cold-side charge air boot fits any turbocharged heavy-duty diesel installation that uses a 3.5" ID x 6" straight section on the cold (post-intercooler) side of the boost piping. Common applications include:

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

Measure the failed boot before ordering — charge-air piping varies position-to-position on the same truck, and a 3.5" ID hose will not seal a 3" or 4" tube.

Related 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 existing hose inside diameter and length before ordering. Confirm clamp size matches the 0.16" wall thickness.

Returns
All Pro Truck Parts offers lifetime returns for any reason on NEW, UNOPENED items in the original packaging, with exceptions (see restocking fee, excluded categories, used items, sale items and special order items below).
To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging.

Restocking fee and return shipping
Returns of new, unopened items are subject to a 20% restocking fee, which is deducted from your refund. You pay the shipping to send the item back, and shipping costs are not refunded.

Excluded categories
Engines cannot be returned. If one is defective, see defective parts (warranty) below.

Used items (if applicable)
Items marked as USED at the time of sale will be accepted for return up to 30 days from the date of sale.

Defective parts (warranty)
A part that fails is handled through the manufacturer's warranty process, not as a return. The manufacturer reviews the claim and decides whether the part is defective for the application it was purchased for. If you need a part right away, you will need to purchase a replacement rather than wait on the warranty review. Start a warranty claim at help.allprotruckparts.com.

Sale items (if applicable)
Only regular priced items may be refunded. Sale items cannot be refunded.

Special order items (if applicable)
Special order items may be eligible for a refund. The decision to accept a special order item for refund is left solely to the All Pro Truck Parts management team.

How to start a return
Start your return online at help.allprotruckparts.com/returns with your email or phone number and order number. Questions? Text us at (903) 527-5854 or email sales@allprotruckparts.com.
Ship your return to: All Pro Truck Parts, 3948 Interstate 30 W, Caddo Mills TX 75135, United States.
You are responsible for paying the shipping costs to return your item. Shipping costs are non-refundable. If you are shipping an item over $75, we advise using a trackable shipping service or purchasing shipping insurance. We don’t guarantee that we will receive your returned item.

Refunds
Once your returned item is received and inspected, we will send you an email to let you know we received it and whether your refund is approved.
If approved, your refund will be processed and credited to your credit card or original method of payment within 7 business days. For orders paid on our card terminal, text or email us to start the refund.

"Free Shipping" orders
If we paid the shipping on your order ("Free Shipping"), the cost of shipping it to you will be deducted from your refund when the item is returned and inspected.

Exchanges
We only replace items if they are defective or damaged. If you need to exchange it for the same item, start it at help.allprotruckparts.com/returns or text or email us, and send your item to the return address above.

Read our full return policy.