I took some time look over the AC condenser and Tranny cooler assembly mounted in front of the charge cooler, that is in front of the radiator.

The AC condenser is on top and is about 10 Inches tall and 18 inches wide. Directly below it is the 5 inch tall 18 inch wide tranny cooler. The electric fan covers, maybe 20% of the tranny cooler at best. The AC condeser gets the lion's share of the fan throughput.

The electric fan is obviously triggered by the AC condenser temperature. This answers some of the mystery of the "fan on with a slightly warm engine" case.

Anyway.... the auxillary tranny cooler that I added has nearly doubled the cooled surface area, given the small stock cooler.

The AC condenser seems tiny, for the compressor capacity and partly explains the 5 to 10% hit in mileage I get when the AC is used.

Always room for improvement, I guess !

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06 CRD LTD - Suncoast TC- Shift Kit - Spicer UJ - FRKNLIFT - F37 - Magnaflow - 22.0 City - 24@65MPH - Fumoto F-102 - AUX T Cooler - Tank Lift Pump

Bill,

It just does not seem right that we only get 20 mpg.
I look at this system and shake my head.
We could be getting this mileage in a 5.9l Dodge.

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'06 Jeep Liberty Sport CRD with: GDE Hot Flash and Tranny Flash, ehm, Cummins fuel pump, 3" Magnaflow muff, Moog K3199's, Skids, 225-75-16 10 ply, OME springs, Euro T/C, Shift kit, Trans cooler w/thermal bypass, Bigboy bkt, Samco CAC, Brake controller, Trans temp gauge, Al's Upper Arms

Well, we can only expect 30% better mileage than another 4500 lb vehicle with the same power, roughly speaking. We do get about that when compared to the gasser libby.

anyway, the data for the dodge 5.7 is quite a bit worse

from http://www.fueleconomy.gov/feg/bymake/Dodge1998.shtml
Dodge Dakota Pickup 4WD 8 cyl, 5.9 L, Automatic 4-spd, Regular 12 mpg city 16 mpg hwy

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06 CRD LTD - Suncoast TC- Shift Kit - Spicer UJ - FRKNLIFT - F37 - Magnaflow - 22.0 City - 24@65MPH - Fumoto F-102 - AUX T Cooler - Tank Lift Pump

IIRC the ol' F37 didn't help the fuel mileage that it took it down 1-2mpg.

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Ryan
2006 Ford F-250 PSD CC FX4
**GONE**
2005 Jeep Liberty CRD
SAMCO Hoses//GDE Tune//PML Trans Pan//TransGo HD Shift Kit//MBRP Exhaust

1986 2R Mustang SVO

I think he was comparing to the 5.9 Cummins in a full size Ram. I have a friend with a 1998 with the 3.73 rear end (I think) and a 5 speed. He gets 24 mpg on the highway during the summer, with no load.

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2006 Liberty CRD Limited
Mopar engine, transmission, transfer case skids
245/70/16 Michelin Latitude X-Ice (winter)
235/75/16 Firestone Destination ATs (summer)
Thule roof rack, cargo box
V6 airbox mod
Flowmaster 50 2.5 inch muffler
Edge EZ module (set for fuel economy)
SEGR
TDIWagonGuy CCV filter
B99 (summer), B20 (winter)

Okay, I see the point.

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06 CRD LTD - Suncoast TC- Shift Kit - Spicer UJ - FRKNLIFT - F37 - Magnaflow - 22.0 City - 24@65MPH - Fumoto F-102 - AUX T Cooler - Tank Lift Pump