SKU: 64976363296

Fleece Performance FPE-CLNTBYPS-CUMMINS-0305 Cummins Coolant Bypass Kit 2003-2005 Auto Trans Fleece Performance

Sale price$245.70 Regular price$273.00
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Ships within 48 hours · Estimated delivery Jul 18 - Jul 23

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Description

Fleece Performance FPE-CLNTBYPS-CUMMINS-0305 Cummins Coolant Bypass Kit 2003-2005 Auto Trans Fleece PerformanceIncreased 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

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.

Benefits:

  • 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.

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.
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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: 64976363296

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Debbie Grant
Natrona Heights, US
★★★★★ 5
Super soft blanket!
Color: Frosty Purple, Size: Twin(60"x80")
Absolutely love this blanket! It’s super soft and so fluffy! It looks amazing on my bed. Love the color too. I got purple and it looks so soft and warming! My grandchildren love it too!!
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Reviewed in the United States on April 26, 2026
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Acs
Massapequa, US
★★★★★ 5
Super soft and cozy!
Color: Pink, Size: Twin(60"x80")
Love it! Super soft, perfect weight. I bought the pink/dusty rose color and it’s beautiful. I washed it once and did held up and didn’t shed. I will update my review if it starts to fall apart, but so far, very happy with my purchase. The throw blanket seems to be good quality, great price… did I mention I love it?
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Reviewed in the United States on December 14, 2025
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Ilene Cullman
San Leandro, US
★★★★★ 5
Soft and comfortable for my mom
This was a perfect gift for my mom. She loves it. It’s very soft and uncomfortable a good weight not too heavy not to light.
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Reviewed in the United States on May 31, 2026
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DCL
Charlottesville, US
★★★★★ 4
Very nice.
Color: Tie-dye Beige, Size: Throw(50"x60")
Super soft the colors are lovely, a bit pricey but looks great at the end of the bed.
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Reviewed in the United States on May 13, 2026
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Todd Giesen
Grantham, US
★★★★★ 5
Delivers Perfectly
Color: Tie-dye Beige, Size: Twin(60"x80")
Beautiful, fluffy, and comfy.
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Reviewed in the United States on May 27, 2026

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