SKU: 65927392316

Fleece Performance FPE-CLNTBYPS-CUMMINS-VP VP Coolant Bypass Kit 1998.5-2002 Fleece Performance

Sale price$170.55 Regular price$189.50
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Ships within 48 hours · Estimated delivery Jul 17 - Jul 22

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Description

Fleece Performance FPE-CLNTBYPS-CUMMINS-VP VP Coolant Bypass Kit 1998.5-2002 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 and up 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.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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  • 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: 65927392316

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Steven M.
Bozeman, US
★★★★★ 5
Ready for the “Wild Elegamce “ ball!
Color: Red, Size: X-Large, Color: Red, Size: X-Large
It runs a little small so even though I usually wear a large, the extra large is good for me as recommended by other buyers. It’s going to be perfect for iur “Wild Elegamce” fundraiser ball in October!
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Reviewed in the United States on May 28, 2026
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Terrance A Durant
Los Angeles, US
★★★★★ 5
Looks better than the picture
Color: Red, Size: X-Large
Fits as sized
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Reviewed in the United States on May 31, 2026
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Brittany Jones
Los Angeles, US
★★★★★ 5
Showstopper
Color: Gold, Size: Medium, Color: Gold, Size: Medium
Theme was Hollywood. It was a real showstopper 10 out of 10 we ordered a medium. He weighs 155 pounds.
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Reviewed in the United States on May 7, 2026
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Joey ZaZa
Battle Creek, US
★★★★★ 5
This jacket is a head-turner.
Color: Red, Size: X-Large, Color: Red, Size: X-Large
This is a fantastic jacket for the price. I was very impressed by its appearance. I wore the jacket in Las Vegas and got so many compliments from both men and women. Pair this with a black turtleneck and you will be a superstar.
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Reviewed in the United States on March 13, 2026
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Bryan
Waukegan, US
★★★★★ 5
Crowd pleaser
Color: Gold, Size: Large, Color: Gold, Size: Large
Stand out in this jacket. Be warned it does have glitter on the jacket.
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Reviewed in the United States on March 22, 2026

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