What was done to your JK this week?
Originally Posted by ronjenx
Went from electric cooling to mechanical cooling.
Here is the write-up: https://www.jk-forum.com/forums/modi...trofit-235132/
Here is the write-up: https://www.jk-forum.com/forums/modi...trofit-235132/
Originally Posted by dpowell5523
Why would you want to do this? Doesn't it take away from an already weak engine?
However, this option only seems to make sense for hot climates. In cold climates it might cool the engine below the normal operating temperatures, even though there is a flux valve at the radiator. Also, it stops cooling the engine when it stops. I noticed, in my JK, that the fan still runs for a bit after I turn it off and sometimes kicks in immediately after I turn it on if I just park my Jeep for a couple minutes (e.g. dropping my son at school). How does it account for that?
Also, in hot climates, in stop-and-go traffic I imagine having the electric is a good idea since it spins much faster than the mechanical, thus providing more cool air? Or the mechanical already draws more same amount of air at lower speeds?
Last edited by Sahara_Maverick; Jun 7, 2012 at 03:12 AM.
From an energy standpoint, not really. The electric fan requires X kW of electricity to run, which is supplied by the battery and alternator, which is spun by the engine.
However, this option only seems to make sense for hot climates. In cold climates it might cool the engine below the normal operating temperatures, even though there is a flux valve at the radiator. Also, it stops cooling the engine when it stops. I noticed, in my JK, that the fan still runs for a bit after I turn it off and sometimes kicks in immediately after I turn it on if I just park my Jeep for a couple minutes (e.g. dropping my son at school).
How does it account for that?
However, this option only seems to make sense for hot climates. In cold climates it might cool the engine below the normal operating temperatures, even though there is a flux valve at the radiator. Also, it stops cooling the engine when it stops. I noticed, in my JK, that the fan still runs for a bit after I turn it off and sometimes kicks in immediately after I turn it on if I just park my Jeep for a couple minutes (e.g. dropping my son at school).
How does it account for that?
I've never had my electric fan stay on after shutdown, even when the water temperature was calling for it to be on.
The transmission has always come right up to 80°F, even when it was below zero here. So, I don't see over cooling as an issue with the transmission. 80°F is the temperature at which normal shifting resumes. I'll know for sure if this makes a difference this winter.
Even with an aux cooler, the trans temp will climb when in traffic and off road, due to reduced air flow through the grill. This will keep the air flowing into and out of the engine bay. It's bound to keep everything a lot cooler.
I'll know after a few tankfuls if there is a significant increase in gas consumption.
So far, it looks like the intent of this mod is being accomplished: lowering the overall temperature of everything that generates heat, and forcing that heat out of the engine bay.
I won't see any possible negative effects until it's been installed a while, and at least through a winter.
Positive and negative will receive equal time in future reports.



I think that's where all the mosquitoes in my neighborhood came from. 
