Douglas Ashe

Ok,so I put on the big hood vents.
A Mishimoto radiator.
Mishimoto triple fans.
Flowkooler water pump.
High flow thermostat housing.
Mishimoto 180 degree thermostat.
Mishimoto silicone hoses.
It still runs hit with the air on.
It still gets too hot sitting in a drive thru.
Hell,I don't know what else to do.
About $1200 worth of stuff,and I swear it ran cooler before I did any of this.
Any thoughts?

EZEARL

Could be blocked cooling passages in the engine restricting flow and not transferring heat fast enough.

BlueRidgeMark

It probably ran cooler $1200 ago. First, they just run hot. 210 is the normal operating temperature. However, if the stock system is all working correctly, it will do just fine in Phoenix in the summer sitting in traffic. At least, that's what some of our Phoenix members have said.

BTW, the thermostat is a mistake. A cooler thermostat does NOT make the engine run cooler. A t-stat does not control the operating temperature. It only controls how soon the t-stat opens.

If it were my Jeep, I'd start by losing that high flow pump and incorrect T-stat. The coolant has to stay in the radiator long enough to lose heat. A high flow pump is probably moving it through too fast. It might make sense in a race engine with an oversized radiator.

Then see what you have, and go from there.

EDIT : I made a big boo boo! I left out a very important word. It should have been, "A cooler thermostat does NOT make the engine run cooler"

NOT!! NOT!!

Douglas Ashe

I got a bigger radiator.
It was $350.
Supposed to be 50% bigger with 200% more flow.

EvanM

I agree with water pump and tstat advice however I don't believe they run hot

Douglas Ashe

What thermostat should I use?

EZEARL

195 degree MOPAR.
So you had a overheating issue before changing out for all those parts? What overheating symptoms were you having? Thing is as BlueRidgeMark said an OEM cooling system if working correctly does fine. Seems to me you could have a coolant flow issue.

cruiser54

Listen to these guys^^.

And, how are you determining "running hot"?

Douglas Ashe

If I use the air,it will run hot,I mean up to boiling.
Even going down the highway with all three fans running.
It'll get up to 225.Cut off the air and it'll drop back down.
I'm no "mechanic",but I've always liked to use blue rtv and make a nice blue bead you can see,on water pumps,thermostats,etc.
Do you think it's possible that I used too much,and some might be blocking the flow?

00t444e

The triple fans and the radiator are likely what's causing your cooling issues. There have been several threads about people having issues with a triple e fan setup and an aftermarket 2 or 3 core radiator. Replace all of that with a Spectra factory replacement radiator and a put the clutch fan back on with a fan clutch for a 4 cyl XJ and a factory e fan on the other side, your cooling issues will go away if everything is done properly.

BlueRidgeMark

Yep.

I suspect the e-fan setup impedes the air flow at highway speeds. Can't prove it, but from reading many threads like yours, it looks that way to me.


There is something very weird about your Jeep running that hot when the AC is on, though.

EvanM

Does the heater work well?

Douglas Ashe

Yeah,the heat works well.It takes it a little longer to heat up now but it works well.

EZEARL

There have been quite a few threads where XJ owners have "upgraded" their cooling systems only to find it didn't cure their overheating issue or it actually created one where none existed.
If you have an overheating problem you need to find out why before "firing the parts cannon".

EvanM

Was thinking if you had heater not working well would indicate plugged up internaly.

Does coolant look good or is it brown and merky looking