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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Ships within 48 hours · Estimated delivery Sep 16 - Sep 21

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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.
Shipping Notes
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Exchange/Return Notes
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SKU: 79875913181

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Tootie
Chelsea, US
★★★★★ 5
Dapper
Color: Sage Green, Size: 18
Suit is light weight and perfect for my son's homecoming dance. Sage color is as described and fit was accurate as well. Nice suit and material for the money.
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Reviewed in the United States on May 1, 2026
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Kindle Customer
San Leandro, US
★★★★★ 5
Very nice for the price.
Color: Ivory, Size: 7
Was good quality material. Looked so good on.
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Reviewed in the United States on May 15, 2026
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Kate Stack
Cuba, US
★★★★★ 5
Great suit
Great quality and looks very expensive. Fits true to size
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Reviewed in the United States on April 11, 2026
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cara
Pawtucket, US
★★★★★ 3
to big, material cheep looking
Color: Ivory, Size: 12
to big, material cheep looking
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Reviewed in the United States on April 29, 2026
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Iesha
Lake Worth, US
★★★★★ 5
Purple suite
Color: Lavender Purple, Size: 16, Color: Lavender Purple, Size: 16
Love it was perfect. The color was nice it was soft and the size was perfect . I bought the purple one.
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Reviewed in the United States on April 5, 2026

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