Looking to reduce thermostat to 180, increase number of blades, and replace fan clutch that kicks in at 190.
My concern is overloading belt and fan engaging unnecessarily.
1999 TJ 4.0L automatic 31" tires aired to 32#
You can see the TJ in my Jeep gallery
I've since modified the stinger and cut out a large triangle opening to allow for better air flow.
I've cinched the winch hook to the bumper instead of the stinger.
I've reworked the winch cover to close fit to allow better unobstructed air flow.
Flat and level TJ runs smooth as silk at 85 and 215 degrees, but
pulling any slight hill at 75 mph pushes engine temperature over 230; must slow down to 60 to stabilize at 215. Ambient air 90 and RH 28%.
My transmission cooler covers the entire grill side of the radiator and the fins are perpendicular between the two radiators. From my limited experience with making a lift gate for one of my trailers, the small openings at 60+ miles per hour block the air flow and most of the air sheets off rather than going through the finned openings. For my unprepared mind, this perpendicular configuration doesn't make sense to me because the radiator is capable of more air flow than the transmission cooler will allow.
Is this a stock configuration for a TJ? Or is this someone's attempt to get cooler transmission temperatures? (incidentally, no installed temp gauges)
The gaps at the bottom between the 2 radiators allows for the fan to pull in fresh air from that direction, if the fan engages. If the fan does not engage, then the air through the transmission cooler can partially shunt around engine radiator.
Routinely get 100 ambient temps here.
I'd like to change out the thermostat to 180 and get a fan clutch that kicks in at 190.
I never hear air flow at any temperature, so I'm contemplating which thermostat, blade, clutch option is best.
Is there a reason why the engine temperature must be 210 all the time?
I'm sure the engineers are much more endowed with well considered ideas than mine; but just thinking. I don't want to waste money on an effort that someone else has already tried with unsuccessful results. Or change something where there is a known reason not to.
Definition of Insane: Doing the same thing repeatedly under the same conditions and expecting different results.
Last edited by QESdunn; 08-14-2013 at 08:24 PM.