so i put in a two row radiator last night because my jeep was overheating after long drives etc..it deff needed it but now its running at about 150 degrees is this bad any ideas what the issue could be? i also noticed my fan runs all the time, should it? thanks for any help, 97 zj 4.0

 

Obviously you have a blown or no thermostat. It's job is to keep the engine at it's setpoint, at least 190* or 210*, whichever you're supposed to be using. The PCM needs that temp to set the mixture right.

The fan on my '97 ZJ was viscous clutch drive and DID run all the time.

 

thanks for you response, is that something that would get disrupted when changing the radiator? im kind of a newb and did it with my buddy..just ordered a 195 degree stant thermostat reguardless hopefully its just that..thanks again!

 

Thermostats don't have an infinite life expectancy and can fail for any number of reasons, but the most common is an overheat or many cycles of running hot. It's good practice to replace them whenever you do a system flush and replace the coolant. Most makers suggest doing this every 2 years.

RI huh? I was a military brat and did all of my high school years in Warwick. PM me if this interests you.

 

I answered this question in the XJ area yesterday and gave him the same answer.

 

Okay.....

 

Doesn't hurt to hunt a second opinion.

 

thank you for your help i am out of burrillville ri a nice woodsy town in the northwest corner with a surprising amount of 4x4 trails and powerlines, my jeep is my dd but i still like to take it out once in a while and get it dirty

 

I was wondering what it really was a Grand or a Cherokee being in both areas was all.

 

Okay, a Cherokee has rear leaf springs and the Grand has coils all around. The Cherokee doesn't have all the luxury things that the Grands do.

Plexj90, I sent you a private message. Check it out.