Join Date: Mar 2006
Location: Helsinki, Finland - on the European side of the Atlantic
Really.......even in cold, cool, moderate temps like when using the heater or no a/c needed?
In cold weather, t-stat closes and opens as necessary. However, once the engine has warmed up it pretty much never fully closes apart from the very harshest cold.
I've had the e-fan kick on multiple times on my niner (they don't use viscous fan at all) when it's around -15*F outside, so it goes on to show how much heat engines actually produce -> that being said it also goes on to show how much heat there is in the radiator, which in turn means in many cases you do need an auxiliary tranny cooler even if you don't tow often. As it's been said, in warm climate where below- freezing temps aren't common I really see no reason to route the tranny fluid through the radiator; just use an external cooler in front of the radiator/ AC condenser.
1998 Grand Cherokee 5.9 LX daily driver, 1.75" BB, 32" KM2s, HPD30 Eaton e-locker/D44a stock LSD, 4.56 gears, custom- fabbed tube bumpers and tube fenders,...
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1990 XJ Limited (4-door), 4.0 I6, AW4, NP242, ***rolled and totalled @ 165k miles***
1990 XJ (4-door), 4.0 I6, AW4, NP242, PBR 42" tires, Unimog 404 portal axles, 110" WB, full cage + uniframe completely rebuilt, front 3-link + panhard / double triangulated 4-link rear,... ***SOLD***