Fleece Performance Coolant Bypass Kit W/Stainless Braided lines 06-07 5.9L Auto Trans Cummins
SKU: 55573487939

Fleece Performance Coolant Bypass Kit W/Stainless Braided lines 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 W/Stainless Braided lines 06-07 5.9L Auto Trans CumminsHelp eliminate the possibility of scored rear cylinders and blown freeze plugs in your 5. 9 Cummins with this Coolant Bypass Kit from Fleece Performance! The Fleece Coolant Bypass with Stainless Lines 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

Help eliminate the possibility of scored rear cylinders and blown freeze plugs in your 5.9 Cummins with this Coolant Bypass Kit from Fleece Performance! The Fleece Coolant Bypass with Stainless Lines 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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Exchange/Return Notes
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SKU: 55573487939

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Area313
Whiting, US
★★★★★ 3
Pretty good for something quick
Color: Black, Size: X-Large
Nice quality but the pants were tighter than what my kid wanted.
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Reviewed in the United States on April 5, 2026
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Maria Stean-Short
Houston, US
★★★★★ 5
Perfect Slim fit.
Color: Navy Blue, Size: Large
Amazing fit for a young teen.
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Reviewed in the United States on March 31, 2026
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Cynthia O.
Omaha, US
★★★★★ 5
Good quality vest for the price
Color: Navy, Size: Medium
This vest was purchased for prom, arrived on time and the color was as advertised. My son is 6ft2 and weighs 152lb so I purchased a large size and it fit him perfectly. This vest looks amazing for the price, very affordable and good quality for something that will not be worn daily. My son said it was very comfortable and it looked good.
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Reviewed in the United States on May 14, 2026
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Louis B.
Fort Morgan, US
★★★★★ 5
Good looks
Color: Black, Size: Large
Great fit great product I would buy again
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Reviewed in the United States on June 1, 2026
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Brian K.
Waukegan, US
★★★★★ 5
Looks and fits well
Color: Black, Size: Large
More than I expected, frankly. It is well constructed, fits well, and looks really good. I wear it with my tux instead of a cummerbund. It works and looks better, and I never have to worry about the stupid cummerbund ending up around my knees.
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Reviewed in the United States on April 8, 2026

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