RAdiator Fan Removed

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Been thinking about taking the fan off, What about Auto trans oil temps? The fan pulls a lot of air through the transmission cooler, how much difference are you guys seeing in transmission oil temps? I have a temp gauge on mine, but would like to know before I try it myself.

 

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My transmission temp only went up to 150 during the climb over the mountains, that was with the fan engaged. Without the fan on, during normal cruise and in town, my temp would barely move the needle from 90.

 

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Just got back from a cruise. Truck unloaded.

Approx ambient temperature 23º

Started with a warm engine (approx 100º)

Drove back roads at about 40 mph, tach around 1600 rpms

At the 8 mile mark coolant temperature read about 165-170º.

Wanted to get it up too about 190º. Ran truck at a higher RPM & speed.

Temp is now up to about 180º at the 12 mile mark.

Finally at the 17 mile mark, as I shut the truck off in the driveway my engine temperature read 190º.

Thats goes to show you to build heat into this large capacity cooling system in a cold outdoor temperature with no load and low engine RPM's is tough.

NOTE: I should mention the above test is with the engine fan removed and the front of the radiator completely blocked with cardboard! #ad



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Bill R
94 2500 SLT 4x4 5 Speed, 3. 54 LS, JRE 4" exhaust, Autometer Pyro, Boost & Water temp gauges, Bosch 215 HP injectors, Timing @ 14. 7 º, JRE Stage III #4 plate 270/675, AFC spring kit, Scotty Air, Bully Dog Propane Injection, Roadmaster Active Suspension, Optima Red Tops, Geno`s Exhaust Blanket,Espar Heater (won it!), Synthetic lubes throughout.



[This message has been edited by HEMI®Dart (edited 01-27-2001). ]

 

[Archive]

I pulled my fan off a couple of days ago, and have seen little or no change in the temp gauge. It goes to an area between 170 & 180, I stays there whether I'm on the 4 lane, dirt road, or stuck in traffic. It does seem to warm up a little quicker, which is a plus. I've decided the only reason that fan is there in the first lace is to pull air through the AC condenser if stittng still on a hot summer day. My defroster works fine in this kind of weather (40's). I haven't noticed any "20 HP" increase in power, but it idles quieter without all the fan noise, and might be a little quicker to rev up. I still have my custom cardboard winter front too, except for the trans. cooler part. Auto transmission temp measured at the hot side of the TC remains the same too, about 150. Last month, I put an end to the constant fluctuations on the temp gauge by replacing the thermostat with the latest part # revision, steady as a rock now at about 170-180.

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Locomotive Engineer/Red Ram Driver! 97, 2500, Auto,3:54, 2WD, Re-sale Red, Loaded w/Leather, Diamond Tread running boards & box, Bumper guards, "Bull Ring" tie-downs, Front bumper guards, Clearance lights, TST 230 HP kit (slid forward 1/16"), Missing silencer ring, K&N, Combo exhaust temp & boost gauge, Eng. & Trans. oil temp gauges, 3 Pos. Lock up switch.

 

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One more thing to remember about removing the fan. According to the Haynes Manual, you should store the fan in an upright position. Don't lay it down flat, the viscous fluid will leak out of the clutch if not stored upright.

 

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The faster you go, the more horsepower is used for the fan (when it's engaged). I dyno'd mine with and without the fan engaged and found that at about 40mph it sucks near 7hp while at 60mph it sucked 21hp. Of course the fan isn't always engaged while your driving.