Shamrock96

Ok So i will jsut dive in to the meet and potatoes:
Xj has been running too hot and i have to use the aux fan, I have it on a switch for when i want it on, to bring the temp down fast enough. I just replaced the radiator and it was working great idling in the driveway for 20 minuets. As soon as i started driving heat started to creep up. So i am going to take a look at my clutch fan because that may have something to do with it and also, now please go easy on me for this, i put the wrong thermostat in without knowing it. The guy at the parts store gave me a 160 T-stat and ididnt know it till i was going thru my recepts. Now is running this low a t-stat part of what is causing my problems?

djb383

Only way a t-stat will cause overheating is if it remains closed. The t-stat does one thing.....control minimum coolant temp. All of the other cooling system components, their condition, along with ambient temp and driving conditions determine max coolant temp.

Usually, overheating on most any vehicle is due to owner neglect.

ZINGGG

^This.

There's a few more components of the cooling system you have not addressed.

Shamrock96

This is with my reman engine, i only have 125 miles on it because i dont want to overheat it. I installed an aftermarket aux fan but it is not exactly a perfect fit. I am working on getting an oe style aux fan. The cooling shroud is brand new, the water pump is brand new, thermostat housing is new, heater control valve is new, serp belt is new. The only parts that are not new are the hoses. I have an aftermarket a/c condenser installed but it is not hooked up to anything as of yet, also i have an aux, tranny cooler.

ZINGGG

Radiator cap? I'd try a different thermostat

partsguyct

did you copy and paste this to a notepad document on your computer? Lol exactly the same in every overheating thread

partsguyct

When you filled the coolant after the new radiator did you "burp" the system? That's a small possibility if you missed that step it will cause temps to rise as the air pocket moves around.

mylast96xj

I put a 180 tstat in and it now runs about 180. Does this cause problems??

djb383

Yep, as many times and all the info I've post in overheating threads, it's hard to believe that a seasoned member wouldn't use "search" and become an expert on the XJ cooling system, it's faults, fixes and how a properly functioning cooling system works.......huh.

djb383

Only for those that think the "factory normal operating temp" is 210.LOL

partsguyct

I've tried search before every thread I post but it comes out with everything but what I'm looking for. There should be a sticky for the most common systems like cooling, ignition, and I can't think of the other one with tons of threads.

DieselD

What is it supposed to run at? Mine stays just an *** hair below 210 on the dash gauge, who knows what it really is but I don't over heat lol

Shamrock96

And yes I am aware of this, you wrote this on another of my threads. I know that the thermostat has nothing to do with temperature max or running temperature, I was just curious as to weather the xj is picky about its thermostat. I am going to put in a 190 thermostat and remove my condenser for now. Now my other question is which is better in an XJ, Thermostatic or Centrifugal fan clutch?

AVjeeper

Try a mix of 75% water to 25% anti-freeze and a bottle of Water-Wetter, and burp the system with the heater on.

djb383

Thermal.