SKU: 79875913181

Fleece Performance Coolant Bypass Kit 06-07 5.9L Auto Trans Cummins

Sale price$170.55 Regular price$189.50
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Description

Fleece Performance Coolant Bypass Kit 06-07 5.9L Auto Trans CumminsHelp eliminate the chance of scored rear cylinders and blown freeze plugs on your 5. 9L Cummins with this Coolant Bypass Kit from Fleece Performance! The Fleece Coolant Bypass solves the problem of excessive coolant pressure before it becomes a problem. The integrated secondary thermostat locates at the back of the block and allows coolant to flow freely when at normal operating temperatures ensuring consistent temperatures across all six cylinders

Help eliminate the chance of scored rear cylinders and blown freeze plugs on your 5.9L Cummins with this Coolant Bypass Kit from Fleece Performance! The Fleece Coolant Bypass solves the problem of excessive coolant pressure before it becomes a problem. The integrated secondary thermostat locates at the back of the block and allows coolant to flow freely when at normal operating temperatures ensuring consistent temperatures across all six cylinders and eliminates excessive pressure. The kit comes with high quality AN o-ring fittings and AN hose connections with braided hose to ensure a leak free installation and installs in two hours or less!

Increased Coolant Flow, Decreased Coolant Temperatures - The rear cylinders on the 24 Valve 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. Fleece's 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 24 valves 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.
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SKU: 79875913181

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margaret porter
Dallas, US
★★★★★ 5
PERFECT BACKPACK!
Color: Chocolate
I cant say enough about this backpack. First of all the brown color is super cute. Its incredibly spacious, great for travel, so many compartments.... love the space for shoes. Just perfect
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Reviewed in the United States on May 21, 2026
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Terri Gardner
Belleville, US
★★★★★ 4
Nice personal item for travel
Color: Black
I recently used this bag on my cruise. It fits perfectly under the seat for a personal item. The quality is nice and the bag is spacious to back many items. The only thing I didn’t like is that I kept having to adjust the straps due to them coming loose.
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Reviewed in the United States on January 27, 2026
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Niq McClelland
Dallas, US
★★★★★ 5
Hidden Gem!
Color: Desert
Huge and suitcase like on the inside. The zipper is the same color as the backpack and looks luxurious. Very soft and cushy even with heavy stuff in it. Like a laptop. Which there is a specific place for it that is cushioned. But my favorite by far is the clear pockets on the inside. I like that you can see what your getting out of your bag and where to find what. Also the outside pockets are really useful! And kinda incognito which is great for if you want to put valuables there. You can use this for travel, school and work. It's very versatile. Very good for organization. Comgortable and easygoing. Quality is 5/5.
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Reviewed in the United States on July 29, 2025
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marlene warren
Boise, US
★★★★★ 5
Great backpack for traveling
Color: Grey
Hold so much and is very light weight. Fabric seems to hold up well on train and airplane travel. Love the side pockets and shoe storage pocket!
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Reviewed in the United States on May 30, 2026
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Kristina
Lake Worth, US
★★★★★ 5
Very sturdy and functional! Lots of storage, so many pockets!
Color: Black
Amazing for personal item on the plane! So many pockets!
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Reviewed in the United States on May 16, 2026

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