[comptiger5000]

Stovie - Stock t-stat in your Jeep is a 195*. Going colder than a 180* will most likely trip a CEL for running too cold, and isn't good (nor is there any benefit). If you do an e-fan conversion, set it to kick on around 200* and off around 190* with the 180* t-stat.

Also, dropping to a colder t-stat doesn't fix an overheating problem unless the old stat was bad. It can simply band-aid it by allowing more time before it overheats, which typically allows time to get moving again (if it's an issue in traffic). ZJs are known for running hot in traffic, particularly with the A/C on. As long as it's no more than 1 tick mark to the right of center (just over 220*), it's not even a slight concern. If it hits the 3/4 mark (235*), then it's time to worry.

For comparison, with a 195* t-stat, mine runs 200* when cruising, up to 205* in hot weather. It'll hit 210 - 215* in traffic in the winter (mine's an e-fan, being a 5.9, so the fan cycles). In the summer, however, when the A/C is on and trips the fan sooner when stopped, it runs under 210*. It barely touched the 210* mark when climbing a hill last summer in 105* weather. It stayed around 205* when crusing, 207 - 209* when in traffic. Keep in mind that I'm putting the heat of a much bigger engine through the same sized radiator that you have. If your cooling system is up to par, it should have no issues, and shouldn't get over 215 - 220* idling in traffic with the A/C on, even in 100* weather with the mechanical fan.