SKU: 21639731780

2003-2007 Ram HD Coolant Bypass Kit (FPE-CLNTBYPS-CUMMINS-MAN)

Sale price$180.45 Regular price$200.50
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Ships within 48 hours · Estimated delivery Jul 28 - Aug 2

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Description

2003-2007 Ram HD Coolant Bypass Kit (FPE-CLNTBYPS-CUMMINS-MAN)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: 21639731780

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My2Cents
Bozeman, US
★★★★★ 4
Smells like medicine
I am editing my review to give a better feedback. It smells great on a dog, just like cedar. I tried it on something else first, and it didn't have the same smell. It's good, I approve :) Original review: I am a fan of evergreen and woodsy scents, so I had high hopes for this. Unfortunately it smells "mediciney" to me, I don't know how else to describe it. Kindof reminds me of Vicks vaporub when I was a kid.. pretty disappointing.
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Reviewed in the United States on January 24, 2026
S
Verified Purchase
Shirley Scully
New York, US
★★★★★ 5
Great for stinky dogs
This stuff worked for my two dogs I have a Chihuahua and a terrier. They both smell much better.
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Reviewed in the United States on May 24, 2026
J
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JunBug Homestead
Lowell, US
★★★★★ 5
Fleas hate the smell to death!!
So I bought this spray mainly for refreshing my pup during the day. The smell of Furrest is amazing. Fortunately for us, his fleas hate it to death ☠️.I seriously say to death because his fleas were dropping off him within mins of him being sprayed. I love this product and I do plan to mention what it does for us.
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Reviewed in the United States on April 19, 2026
A
Verified Purchase
ALEXANDRA RIQUEL
Cuba, US
★★★★★ 5
Smell good
The smell is like essential oil, but it last for like 5 days.
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Reviewed in the United States on June 2, 2026
K
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Keshuna Tatum-Edwards
Massapequa, US
★★★★★ 3
It’s a okay scent and spray.
Smell okay and lasts little while. The first one I received came busted so had to get a replacement but the second one was fine. Am not too much of a fan of the scent but gets the job done.
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Reviewed in the United States on May 19, 2026

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