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800-622-5103Increased 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:
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.
Application Notes:
The 2003 – 2007 5.9L automatic transmission version will eliminate the factory transmission fluid heat exchanger. The heat exchanger is 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.
The warranty is Limited to one (1) year from the date of sale and
limited solely to the parts contained within the products kits. All
products that are in question of Warranty must be returned prepaid to
the Seller. Dorman products carry a lifetime warranty.
Under no circumstances will the Seller be liable for any labor charged
or travel time incurred in diagnosis for the defects, removal, or
re-installation of this product or any other contingent expenses.
All warranty returns must have an RGA#, YOU MUST CALL TO GET THIS (NO EXCEPTIONS)
No warranty or refund will be issued if unit is not returned to Pensacola Fuel Injection.
Warranty is ONLY valid to original purchaser.
All orders with a core, including PayPal, require that we have a credit card on file (you must call... we cannot get your credit card information from PayPal) on orders with a core value. The credit card on file will not be charged unless the core is not returned within 30 days.