NOTE: With the current state of affairs affecting the entire world with fear of illness and the massive effect it’s had on the economy, we have diminished all importing of US goods unless absolutely necessary. Not out of any kind of fear, but in an effort to wait until the Canadian dollar improves so I can continue to offer the best possible pricing for top quality imported goods. You may experience prolonged delays for non stock items, but upon request, I will gladly expedite required parts. Thank you for your understanding and ongoing support

Fleece Cummins Coolant Bypass Kit
Fleece Cummins Coolant Bypass Kit
Fleece Cummins Coolant Bypass Kit
Fleece Cummins Coolant Bypass Kit
Fleece Cummins Coolant Bypass Kit
Fleece Cummins Coolant Bypass Kit

Fleece Cummins Coolant Bypass Kit

FPE-CLNTBYPS-CUMMINS-12V
Vendor
Fleece Performance Engineering
Regular price
$501.34
Sale price
$501.34
Quantity must be 1 or more

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.

Benefits:

  1. Lowers coolant temperature at the rear cylinders
  2. Ensures consistent temperatures across all cylinders
  3. Prevents damaging coolant pressure build up
  4. 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.

 

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. 

Without Coolant Bypass    With Coolant Bypass

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.

For model years 2007 - 2018 6.7L trucks, including both automatic and manual equipped transmissions, factory installed transmission fluid heat exchangers are uncommon. For customers with a 6.7L that has a heat exchanger, a heater tube can be purchased at your local Chrysler Dealership [PN:68048997AA] to complete the installation.


 

What Our Customers Are Saying: 

    

 


 Installation Instructions:

Cummins Coolant Bypass 94-98 12v

Cummins Coolant Bypass 98.5-02 VP44

Cummins Coolant Bypass 03-07 5.9L Manual & All 6.7L

Cummins Coolant Bypass 03-07 Auto Trans

 

 

Prop 65 WARNING: Cancer & Reproductive Harm - P65Warnings.ca.gov 

Net Orders Checkout

Item Price Qty Total
Subtotal $0.00
Shipping
Total

Shipping Address

Shipping Methods