2003-2005 2003-2005 Ram HD Coolant Bypass Kit (FPE-CLNTBYPS-CUMMINS-0305)
SKU: 30704485363

2003-2005 2003-2005 Ram HD Coolant Bypass Kit (FPE-CLNTBYPS-CUMMINS-0305)

Sale price$180.45 Regular price$200.50
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Description

2003-2005 2003-2005 Ram HD Coolant Bypass Kit (FPE-CLNTBYPS-CUMMINS-0305)The Fleece Performance Cummins Coolant Bypass Kit 2003 2016 is built to OEM or better standards for diesel truck owners who want a no compromise upgrade. Engineered, manufactured, and supported by Fleece the diesel performance specialists. Features Lowers coolant temperature at the rear cylinders Ensures consistent temperatures across all cylinders Prevents damaging coolant pressure build up Complete kit comes with braided hose and AN O ring fittings

The Fleece Performance Cummins Coolant Bypass Kit 2003-2016 is built to OEM-or-better standards for diesel truck owners who want a no-compromise upgrade. Engineered, manufactured, and supported by Fleece - the diesel performance specialists.

Features
  • Lowers coolant temperature at the rear cylinders
  • Ensures consistent temperatures across all cylinders
  • Prevents damaging coolant pressure build up
  • Complete kit comes with braided hose and AN O-ring fittings to ensure a leak-free installation.
  • Kits for MY 2003+ include billet hose brackets.
Specifications
  • Fuel Type: Diesel
  • Engine: Cummins
  • Transmission: Automatic
  • Country of Origin: US
Manufacturer Description

Increased Coolant Flow, Decreased Coolant Temperatures The rear cylinders on the 5.9/6.7L Cummins suffer from a lack of coolant flow, and therefore, experience the highest coolant temperatures.

This can cause excessive pressure to build in the cooling system, especially the rear of the block and blow out freeze plugs externally, or the smaller diameter plugs under the valve cover, leading to a failure.

Our coolant bypass kit adds a secondary thermostat, that unlike other brands, works based on temperature instead of excessive pressure. This solves the problem before pressure becomes an issue by ensuring consistent temperatures across all six cylinders.

Why do I need a Fleece Coolant Bypass? One of the biggest issues on the 5.9/6.7L Cummins is the coolant flow problem to the rear cylinders. This can cause catastrophic failure or blow outs of the freeze plugs in an over-temperature / over-pressure condition.

The Fleece Coolant Bypass is one of the most important additions you make to improve the reliability and longevity of the Cummins platform. The '03-'07 5.9L automatic transmission version will eliminate the factory transmission fluid heat exchanger.

The heat exchanger is not a fluid cooler; it was designed for use in cold climates to warm the transmission fluid with the engine coolant. It is not necessary for use in warm climates or high horsepower applications, nor does it detrimentally affect the trucks performance when removed. All ‘07-‘13 6.7 trucks, both automatic and manual equipped transmissions, do not have a transmission fluid heat exchanger.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 30704485363

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Omar Almasry
Lowell, US
★★★★★ 5
Good quality and size
Size: X-Large, Color: Black, Pocket Description: Plain Front
The size was as expected and the material was really good
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Reviewed in the United States on April 30, 2026
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Customer
Boise, US
★★★★★ 5
I’m a 5’6’’ 140lbs ish woman and I got a Medium
Size: Small, Color: Black, Pocket Description: Plain Front
Paid 10 bucks ! Got a medium . I am 5’6” 142lbs . It’s thick & 100% cotton. A ‘medium ’ seemed big but I intentionally ran it on high heat in the dryer & it shrunk so it fits me perfectly . The sleeves go closer to my elbows than women’s shirts… which I love. The crewneck is perfect so I can do burpees without worrying about plunging necklines. I wear a 36C bra and this tshirt is comfortable around my chest & shoulders. I carry extra weight on my belly and it’s still comfortable. Absolutely love how it looks on me. It says RELAXED fit in the title so I don’t understand why people are grumbling about the looser fit. I love it — thank you Amazon, for offering 100% cotton clothing
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Reviewed in the United States on May 31, 2026
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Backpack I ordered for my granddaughter came in. It is exactly like it looked in the photograph. She loves it five out of five.
West Palm Beach, US
★★★★★ 3
Little bit on the small side
Size: XX-Large, Color: Black, Pocket Description: Plain Front
Run a little small, but the quality of the shirt seems to be pretty good. It is thick and nice. Warm and softness are both good.
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Reviewed in the United States on June 7, 2026
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Michael Leahey
Waukegan, US
★★★★★ 5
Impressed for the most part
Size: X-Large, Color: White, Pocket Description: Plain Front
Going to give it 5-stars for now, well see how well they hold up after a few washes. They for sure feel like nice heavy-weight shirts. I like them alot for that reason. They have a boxy-fit though, so not "fitted" at all but thats fine for me because I am using them as under-shirts.
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Reviewed in the United States on April 19, 2026
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Dan
Lake Worth, US
★★★★★ 5
Wonderful t-shirts
Size: X-Large, Color: Medium Grey Heather
These t-shirts are well made and have a nice thick feel to them. The sizing is spot on.
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Reviewed in the United States on April 17, 2026

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