| To regain some horsepower from the Magnum engine, I decided to replace the mechanical clutch fan and install an electric driven fan to the radiator. This mod is known as "Fan Delete" and done by many with various results.The proof is always in a real Dyno test and this showed a regain of 8-10 HP for the 5.9l Magnum. Considering the low price and how simple this mod is, it's a no-brainer!
I believe that the best fan for a Dodge Durango 2003 with the 5.9l is the unit found in a 91-95 Ford Taurus with the 3.8L engine.To get one, you may want to check at your local scrap yard as I did or browse ebay.
The best part of it is that this fan unit installs perfectly below the Dodge Durango 2003 Factory Shroud with the integrated windshield wiper reservoir and coolant overflow tank. It hides completely below and the factory look is undisturbed.
Electrical Setup & Planning
Wiring the fan unit was a bit tricky but not to complicated. I simply used 3 relais, two of the Bosch 75 amp Relay 0-332-002-150 and a standard 40A automotive relay (which came with my Fan Controller kit), it's a SPDT which means Single Pole Double Throw. SnowDigger Part Info
I also purchased a Derale Performance Single Stage Fan Controller 16738 with a Push-in radiator fin probe for my setup as seen in the picture below from Summit Racing Equipment for 25 bucks plus shipping.
The operation of my setup was planned as follows:
(1) Fan will run on low speed at all times except when the thermostat probe switch is activated.
(2) Fan will switch from low to high speed automatically depending on the PCM which would normally turn the Dodge OEM auxiliary fan on or off.
(3) Installation of a safety switch within the cab allowing the fan to be turned off for water crossings to avoid the usual water spray into the engine compartment. Switch positions are: Off / Automatic.
The OEM shroud with the coolant overflow tank and windshield wiper fluid reservoir (after disconnecting the pumps and sensor for the wiper fluid) needs to be unbolted and put aside. The mechanical clutch fan needs to be un-installed. Then the electrical Taurus Fan unit installed and connected. The fan controller needs to be placed into the radiator. Two Bosch relais will find their way onto the Firewall and a third relay will be installed into the main fuse box. The override switch needs to be mounted into the cab and after wiring everything up, the OEM shroud will be re-installed.
The OEM system on my 2003 Durango is set up with an electrical auxiliary fan unit. This fan is controlled by an relay within the Power Distribution Center (PDC) or main fuse box as I like to call it.
The radiator relay is energized and thus the fan is running when the coolant temperature is above 176°F or the battery temperature sensor is above 10°F or the air conditioning is selected and the battery temperature sensor is above 106°F.
The fan stops when the coolant temperature drops below 180°F or the battery temperature sensor is below 16°F or when the air conditioning is selected and the coolant temperature is below 198°F, or the air conditioning is selected and the battery temperature is below 100°F.
Well, if this isn't confusing! Took me a while to wrap my head around this one. Why is this all important for the new Taurus fan setup? I need to know this because I am planning on engaging the Taurus fan into High Speed when the OEM auxiliary fan would normally engage but switch the Taurus Fan into Low Speed mode when the OEM system would normally disengage.
I identified with my multi-meter that the fat yellow wire within the big cable harness leading from the front of the main fuse box to the inside connects to the 87 tab of the OEM radiator relay. This wire runs normally to the auxiliary fan. I cut it, insulated the end which runs to the fan with shrink tubing and electrical tape and soldered to the other end a yellow cable extension as I am using that wire on my relay setup. This wire will have power once the OEM radiator relay would be energized.
Here is my wiring diagram which I made to use in my setup:
The Taurus fan died a few days ago. The motor has burned out and it popped a fuse, but everything is now back to normal after installing a replacement fan (same type and model). This one I purchased from ebay for 60 bucks. After 3 years I still like this mod!
|Unauthorized use of any materials presented here is prohibited. Copying or reproducing any elements from this page other than for personal use is not permitted. Concept, Designs, Artwork, including the contents of the website such as images created by or for SnowDigger and it's text are ©2013 SnowDigger.com. All Rights Reserved. The logos presented on this site are trademarks of their respective owners. SnowDigger.com is just a fan site, I am in no way affiliated or endorsed by Chrysler, Dodge, or anyone connected with them.